2017 Honda Civic Si Sedan

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The 2017 Honda Civic Si Sedan and Coupe are the eighth iteration of Si, Civic's legendary, enthusiast-oriented Civic variant, whose roots in America date to the 1985 debut of the Civic CRX Si. The new Civic Si is based on the 10th-generation Civic platform, the most comprehensive and performance-minded remake in the model's 44-year history, and substantially advanced the fun, fast and agile nature of Si.

The 2017 Honda Civic Si Sedan and Si Coupe are the first Si models to use turbocharged engines, utilizing an upgraded, high-boost version of the 1.5-liter direct-injected and turbocharged new powerplant that made its U.S. debut in the 2016 Civic Sedan. The new Honda AP2 engine offers drivers more power and torque down low, with a minimum of turbo lag along with a fatter power band, compared to previous, normally aspirated models. All Si models come equipped with a slick-shifting 6-speed manual transmission.

The new Civic Si also benefits from the extensive remake of the 10th-generation Civic platform - which was benchmarked against luxury C-class competitors for ride, handling, steering precision and high-speed stability - and are further enhanced by Si-exclusive chassis tuning and engineering and Si-exclusive performance bits, including a helical limited-slip differential and new Adaptive Damper System and variable-ratio electric power steering. The upgraded performance capabilities of Si are matched by extensive exterior and interior upgrades that strongly distinguish Si from its more mainstream Sedan and Coupe counterparts.

2017 Honda Civic Si Sedan

Powertrain and chassis

Powering the Honda Civic Si is a high-performance, high-torque 1.5-liter, directed-injected and turbocharged DOHC in-line 4-cylinder engine with dual variable cam timing (dual VTC). Mated to a short-throw, 6-speed manual transmission, the powertrain provides a thrilling new driving experience with more low-end grunt and increased torque output across the engine's full rev range compared to the previous Si. Peak output of 205 horsepower1 arrives 1300 rpm lower in the rev range, and the greatly increased peak torque of 192 lb-ft2 (+18 lb-ft) is produced 2300 rpm earlier and sustained over 70 percent of the rev range.

Allowing full utilization of the powertrain, the 2017 Civic Si's rigid body includes highly upgraded chassis and drive components, including a dual-pinion adaptive electric power steering system with variable ratios, sport-tuned suspension, an adaptive damper system, a helical limited-slip differential, larger front brake rotors (12.3-inch) and wider 235/40 R18 tires. In addition to adaptive dampers, suspension upgrades over the Civic EX-T include stiffer spring rates, more rigid stabilizer bars (+7 percent front, +26 percent rear), and solid front and rear compliance bushings, the latter shared with the track-focused Civic Type R.

The 2017 Civic Si now features two driving mode options - Normal and Sport - allowing the driver to choose vehicle dynamic characteristics according to their tastes and the driving environment. From the more comfort-oriented yet well controlled default Normal Mode, the Sport Mode adjusts the suspension damping characteristics plus steering and throttle response for a more taut and direct driving experience.

Sporty design and styling

Upping the sporty style quotient from the standard Civic Sedan and Coupe, the Si models feature an aggressive gloss black "solid wing" front fascia with larger lower air intakes, 18-inch split 5-spoke alloy wheels with high contrast finish, 235-series low-profile tires, and a chrome center-mounted hexagonal exhaust finisher. At the rear, the Honda Civic Si Sedan includes a unique rear fascia and a decklid wing spoiler incorporating a LED brake light. The Honda Civic Si Coupe continues the Civic Coupe's distinctive full-width light bar and adds a prominent raised wing spoiler.

The Honda Civic Si interior features Si-exclusive bolstered front sport seats with red stitching, including stitched Si logos and integrated head restraints. The red stitching carries through to the doors, leather-wrapped steering wheel, shift knob and shift boot. The Si interior also features a red driver's TFT meter and audio system illumination, alloy sport pedals and matte carbon-look trim on the instrument panel.

Interior Comfort, Convenience and Connectivity

The new Civic Si variants offer premium comfort and convenience features building off the EX-T Civic Sedan and EX-T Civic Coupe, including a 7-inch Display Audio touchscreen that serves as the nerve center for control of audio, HVAC and other functions. The Display Audio is integrated with Apple CarPlay™ and Android Auto™ platforms, providing seamless integration of smartphone features and functions, including app-based navigation, streaming audio, voice-controlled search capabilities, and access to a host of Apple- or Google-approved smartphone apps. All Si models feature a 450-watt, 10-speaker premium sound system with AM/FM, SiriusXM® Radio, HD Radio™ and Pandora® capability.

New for the 2017 Civic Si is a Driver Information Interface (DII) that adds a range of selectable real-time information designed to support performance driving. The 7-inch color TFT can display throttle input and brake input application in a graphic percentage format, turbocharger boost in pounds per square inch (psi), lap time (intended for use on closed circuits), race-inspired Rev-limit indicators, and a graphical G-Force gauge that provides a representation of acceleration, braking and cornering forces

In addition, the 2017 Honda Civic Si Coupe and Sedan gain several premium features for the first time ever on a Si model including heated front seats (both cushion and seat back), dual-zone automatic climate control, Walk Away Auto Lock® and an electric parking brake with hill start assist.

Safety Performance

The 2017 Honda Civic Si Coupe and Sedan are designed to provide a high level of collision safety performance in a wide variety of collision scenarios, including offset and oblique-angle frontal collisions as well as side and rear impacts. The Civic's safety performance starts with its class-leading forward visibility and precise, stable and predictable steering, handling and braking performance. Standard four-channel anti-lock brakes (ABS) with Electronic Brake Distribution (EBD), Vehicle Stability Assist (VSA)4 with traction control and Agile Handling Assist further enhance dynamic stability and emergency maneuvering and braking performance. The Civic Si received the highest NCAP 5-star Overall Vehicle Score.


The 2017 Honda Civic Si Coupe and Sedan for the U.S. market will be produced at Honda's plant in Ontario, Canada, using domestic and globally sourced parts. The Civic Si's 1.5-liter turbocharged engine is produced in Anna, Ohio, using domestic and globally sourced parts, at the largest automobile engine plant in Honda's global production network.

Body and Exterior

The new Honda Civic Si Coupe and Si Sedan return the sporty Si model name to the Civic lineup for the first time since model year 2015. To the sophisticated Civic Coupe and Sedan exterior, the Civic Si models add aggressive and athletic exterior features that are visually exciting as well as aerodynamically functional. In front are a distinctive gloss-black "solid wing" grille and headlight surrounds, unique Si badging, a racing-inspired fascia with a larger lower air intake. Unique 18-inch aluminum alloy wheels, low-profile 235/40R18 tires and a subtly longer and lower stance define the Si as a special breed of Civic. While in back, a decklid wing spoiler (elevated on the Si Coupe), unique rear fascia, center exhaust outlet with bright hexagonal finisher and Si badging further identify the new model as performance art.

The new front and rear fascias, together with the rear spoilers and the Civic's already extensive underbody aerodynamic tailoring, helps the Civic Si slip through the air with minimal lift and drag at higher speeds. Lighting on both Si models includes LED daytime running lights (DRL), projector-beam headlights and fog lights, and LED taillights. Based on the Civic EX-T, the new Si models also feature a high level of premium features including an acoustic windshield, a one-touch power moonroof with tilt feature, heated power side mirrors, Smart Start/Entry, a Walk Away Auto Lock® feature, and more.

Exterior Dimensions

The 2017 Honda Civic Si Coupe exterior dimensions relate similarly to those of the Civic EX-T Coupe, and both cars share their 106.3-inch wheelbase and 70.8-inch overall width with the EX-T Sedan and Si Sedan. In comparison to the EX-T Coupe, at 177.4 inches overall, the new Si Coupe is 0.5-inch longer due to its restyled front and rear fascias, and at 54.7 inches, it is also 0.2-inch lower due to its lower-profile 18-inch tires. The Civic Si Coupe's wheel track is fractionally narrower at 60.5 inches front, 61.2 inches rear.

The 2017 Civic Si Sedan shares several key exterior dimensions with the Civic EX-T Sedan, including its 106.3-inch wheelbase and 70.8-inch overall width. From here on, the new Civic Si Sedan exterior differs subtly in its other measurements: its 182.8-inch overall length is 0.5-inch longer than the Civic EX-T Sedan, due to its unique front and rear fascia designs; and the lower-profile 18-inch tires make the Si Sedan 0.2-inch lower in overall height at 55.5 inches. The Honda Civic Si Sedan's wheel track is fractionally narrower at 60.5 inches front, 61.2 inches rear.

Advanced Compatibility Engineering™ (ACE™)

As in all 2017 Civic models, Honda's proprietary Advanced Compatibility Engineering™ (ACE™) body-structure enhances occupant protection and crash compatibility in frontal collisions in the Civic Si Coupe and Si Sedan. ACE utilizes a network of connected structural elements to distribute crash energy more evenly throughout the front of the vehicle, thus reducing the forces transferred to the passenger compartment. ACE channels frontal crash energy to both upper and lower structural elements, including the floor frame rails, side sills and A-pillars.

Crash Stroke

The ACE structure used on the Civic Si features a crash stroke technology developed by Honda engineers in the company's advanced safety research laboratory in Raymond. Ohio. With this crash stroke structure, in a frontal collision the lower section of the front vehicle frame hinges to direct the engine down and rearward, helping direct crash energy into the vehicle's floor while also minimizing cabin intrusion. This crucial piece of safety engineering effectively adds 80mm (3.2 in) of additional energy-absorbing "crash stroke" to the front of the vehicle.

Besides helping the Civic Si receive the highest ratings in the rigorous federal crash tests, the crash stroke structure enabled designers to develop the Civic Si's body design to feature a short front overhang and short hood-line for a unique and exciting appearance, excellent outward visibility and improved handling.

High Body Rigidity

The high bending and torsional rigidity of the 2017 Honda Civic Si Coupe and Si Sedan body structures (+25 percent over previous Civic Si) allows for fine-tuning of the vehicles' suspension systems for superior handling performance. The stiff body structure allows the chassis to work more effectively and reduces the suspension action needed to control body motion. Another benefit of the rigid body structure is a quieter and more comfortable ride for passengers, with less Noise, Vibration and Harshness (NVH) felt over a wide range of driving conditions.

The localized lateral stiffness of the Si Coupe's rear body is 4.6 percent stiffer than in the Honda Civic Si Sedan, primarily due to the differences in the rear body design, and this has significant dynamic benefits.


The Civic Si combines athletic and sporty styling with advanced aerodynamic features to provide a unique and exciting blend of design and functionality. Compared to the Civic EX-T models on which they are based, key aerodynamic details for the Honda Civic Si Coupe and Si Sedan includes unique front and rear fascias, front chin spoiler, and decklid mounted wing spoiler. Above and beyond the Civic Coupe and Sedan's inherently efficient aerodynamics, the new Civic Si aero package directly reduces coefficient of lift (CL) for improved high-speed dynamic performance.

As with the other current Civic models, computational fluid dynamics (CFD) was used to measure aerodynamic efficiency during the design phase, followed by scale-model wind tunnel testing and finally by full-scale wind-tunnel testing. Two critical aero gains from this process include a reduction in engine-room and underbody drag (CdA), which helps improve both fuel efficiency and interior quietness.

Specially shaped components at the front of the vehicle guide airflow through the radiator and into the engine's cold-air intake, while channeling the remaining airflow over, around and under the vehicle. Along with the narrower A-pillars and flush-mounted glass, these contribute to the Civic's efficient passage through the air. The relaxed slope of the Si Coupe's rear roofline and rear window further improves aerodynamic efficiency.

Underbody Airflow

Along with the other current Civic models, the new Si Coupe and Si Sedan feature the flattest underbody of any gasoline-powered Honda production vehicle. A molded under-panel is positioned directly beneath the front fascia, smoothly starting the rearward flow of air underneath the vehicle. An aluminum under-tray is positioned underneath the engine and transmission and features a duct that allows ambient cooling airflow to the hydraulic engine mount. Dual acoustic fiber side under-panels extend from behind the front wheels to just ahead of the rear wheels, further smoothing the airflow as it travels rearward, while also reducing wind noise in the passenger cabin.

Lateral strakes located ahead of each wheel and tire (8.5 inches wide in front, and 3.5 inches wide in the rear) help deflect airflow around the tires for additional aerodynamic efficiency gains.

T-Direction Welding

Applied to the forward edge of the front door hinge pillars, just behind the front wheel openings, a "T-direction welding" technique helps the 2017 Civic earn top ratings in the rigorous IIHS Small Overlap Frontal collision test. Instead of using lateral overlapping welded joints on the hinge pillars, which would be negatively affected by the wheel moving rearward and striking the pillar in an offset frontal collision, the hinge pillars instead use a longitudinal welded seam designed to withstand sheer forces generated in such a collision.

Class-leading Forward Visibility

The narrow A-pillar section on the 2017 Civic Si helps provide a class-leading 84.3 degrees of forward visibility (the angle made by drawing lines from the driver's eye point to the outboard edges of the A pillars). Safety performance is maintained through the pillars' shape, the precise design of load pathways during a frontal collision or rollover, and the use of 1500 MPa hot-stamped ultra-high-strength steel for the A-pillars.

High-Strength Steel

Multiple steel grades are used in the Civic Si's body construction to help achieve excellent overall vehicle dynamics, optimize safety performance, and lower NVH. Materials range from five different grades of steel, including premium hot-stamp steel and ultra-high-strength steel used in the unibody, to aluminum for the front bumper beam. All were chosen to achieve the best combination of strength, rigidity, dynamic performance and light weight. Fully 63 percent of the Honda Civic Si Coupe body structure is composed of high-strength steel, while 64 percent of the Si Sedan body structure is composed of high-strength steel.

Noise, Vibration and Harshness (NVH) Countermeasures

The latest Civic platform takes noise, vibration and harshness (NVH) countermeasures to the next level, positioning it at the top of its competitive set. Both Civic Si models feature strategically placed body sealants. Additional NVH enhancements on all models include acoustic separators inside the A- and B-pillars, while a sound-insulating acoustic windshield further aids overall cabin quietness.

Engine Compartment Isolation

Measures to isolate sound and heat emanating from within the engine compartment include dedicated front, side and rear hood seals, strategically placed heat baffles, a hood insulator panel, an engine undercover, and dedicated insulation within the instrument panel. Inside the vehicle, a one-piece molded insulated carpet liner adds further to exceptional heat isolation and noise reduction for the 2017 Civic SI.

Acoustic Windshield

Special laminated acoustic glass is used for the Civic Si windshield to help reduce noise entering the cabin. Tuned specifically to attenuate wind-noise frequencies, the windshield glass uses an outer layer of 2.0mm safety glass, a 0.7mm thick middle layer of acoustic polyvinyl butyral (PVB), and a 1.8mm safety-glass inner layer for a total thickness of 4.5mm. This helps the Civic Si place at the top of its class in wind-noise performance. The windshield also incorporates UV light-absorbing technology. In addition, flush-mounted 4.0mm tempered front door glass and 3.5mm tempered rear door glass help reduce wind noise in the cabin. The one-touch power moonroof with tilt feature uses 3.5mm tinted and tempered glass.

Sound-absorbing Undercovers

A special baffle plate located beneath the center of the floor pan and felt fender inner liners further attenuates wind and road noise.

Body Sealing

The 2017 Civic Si has an unprecedented level of body sealing to dramatically reduce the levels of noise inside the vehicle. Throughout the unibody are 9.2 sq. in. (coupe) to 9.3 (sedan) of weld seals and other sealers to reduce vibration and the transmission of noise.

LED Lighting

The 2017 Civic Si incorporates a wide range of light-emitting diode (LED) exterior lighting features. These include standard LED daytime running lights (DRL), LED taillights, LED brake lights, LED license-plate light and LED center high-mounted stop light.

Power Side Mirrors

Power side mirrors have a striking design and their body-colored housings are aerodynamically optimized to reduce wind noise and minimize turbulence. The mirrors are heated for improved efficiency in inclement weather and can be manually folded for greater convenience in tight parking situations.

Honda LaneWatch™

Both Civic Si models include Honda's LaneWatch™ display that uses a camera located at the bottom the passenger-side exterior mirror to display a wide-angle view of the passenger side roadway on the Display Audio screen. The image appears when the right turn signal is activated, or when a button on the end of the turn signal stalk is pressed.

One-Touch Power Moonroof with Tilt Feature

The Civic Si Coupe and Si Sedan both have a one-touch power moonroof with tilt feature that will fully open or close with a single touch of the switch. The moonroof mechanism was purposely designed to provide ample headroom.

Integrated Rear Window Antenna

Bonded onto the rear window is a wire-type antenna that is optimized to help deliver excellent radio reception without the negative impact on vehicle aerodynamics that would be caused by a traditional mast antenna.

Power Windows and Locks

Power windows are standard equipment on both Civic Si models and include auto-up and -down operation on the driver and front passenger's windows. Power locks are standard, and a customizable auto-locking feature can be configured using the Driver Information Interface and steering wheel-mounted controls.

Smart Entry and Push Button Start/Stop

The new Honda Civic Si Coupe and Si Sedan include the upscale convenience of Smart Entry & Push Button Start/Stop. The system simplifies approaching, entering and operating the Civic Si. To gain entry, the driver/passenger simply pulls either of front door handles while the remote in his or her possession.

Windshield Wipers

The Civic Si has variable intermittent windshield wipers. Designed to cover the maximum possible windshield area, the left (driver) and right (front passenger) windshield wipers are 25.5 inches and 18 inches long, respectively. For better appearance, the wipers are hidden low on the front cowl when not in operation. The wiper motor uses a built-in ECU that reduces complexity.

Capless Fueling System

The Civic Si's capless fueling eliminates the fuel cap, meaning that fueling the vehicle simply requires opening the fuel lid, refueling, and then closing the lid. This smart and easy-to-use design eliminates the need to touch a dirty fuel cap, reduces the possibility of damaging the vehicle's paint with the fuel cap or tether, or forgetting the fuel cap at the gas station.

Exterior Colors

The 2017 Honda Civic Si Sedan is available in six exterior colors including two metallic colors (Lunar Silver Metallic and Aegean Blue Metallic). Meanwhile the new Civic Si Coupe comes in a choice of seven exterior colors including two metallic colors (Lunar Silver Metallic and Aegean Blue Metallic) and one exclusive pearl color (Energy Green Pearl). All colors reflect the athletic and outgoing character of the new Civic Si models, offering vivid contrasts wherever light plays on the body-panel curves and angles, while also offering an exclusive and upscale appearance.


Like all 10th generation Civic models, the new Civic Si benefits from Honda's vehicle packaging expertise. The Civic interior - with its spaciousness, smart design, comfortable fit and intuitive controls - has always been a competitive strength. And in the Civic Si, that interior architecture has a clearly defined sporting flavor, with bold black seating with red accent stitching, racing inspired alloy pedals, leather-wrapped steering wheel, and red themed instrumentation. Performance driving is supported with selectable real-time information, including turbocharger boost gauge, G-Force gauge and Rev-limit indicator.

With 88.6 (Coupe) and 95.0 (Sedan) cubic feet of passenger cabin volume, the Honda Civic Si Coupe and Si Sedan top the compact-class for interior space and comfort, with class-leading headroom, legroom, shoulder clearance and side head clearance. Rear-seat passengers will appreciate newly shaped front seats with a narrower upper profile (in the shoulder area) and smaller integrated head restraints that lend the rear cabin a more open, airy feel. In keeping with the Civic Si's sporting mission, both the Coupe and Sedan have special high bolstered front seats that enhance lateral support during aggressive cornering.

Both the Civic Si Coupe and Si Sedan offer roomy trunk utility. The Civic Si Coupe has a trunk capacity of 11.9 cubic feet and the Civic Sedan has a trunk capacity of 14.7 cubic feet - both among the largest in the competitive class. Spacious enough to easily accommodate four large golf bags, the trunk area in both Coupe and Sedan is easy to access and use, with a low lift-over height and wide opening. Both Civic Si models feature a 60/40 split and folding rear seatback.

Interior Materials

The new Civic Si interior takes the refinement of Honda's most affordable sedan in an aggressive, sporting direction. The Civic Si interior features Si-exclusive front sport seats with red stitching, including stitched Si logos. The red sport stitching carries through to the doors, leather-wrapped steering wheel, shift boot, and aluminum and leather shift knob. The Si interior also features unique red instrumentation and audio system illumination. Alloy sport pedals, carbon-look accents and titanium silver details highlight the Si's performance attitude.

Interior Design

In both Coupe and Sedan, the new Civic Si interior blends a dynamic and wide layout with smoothly integrated technology features and-high quality materials. Handsome new instrumentation with a red Si performance theme is paired with a full-color 7-inch Driver Information Interface (DII) display and a 7-inch color touchscreen Display Audio system with a clean and sleek appearance.

The Civic has always been known for its user-friendly design, and the new generation Si builds on that reputation. Like the other 10-generation Civic models with completely redesigned packaging, the Civic Si has a more open roomy feel. A redesigned instrument panel made possible a more compact climate control system that opens up added knee room, and the tandem distance (distance between the front and rear seat hip point) is increased 4 inches in the Honda Civic Si Coupe and by 1.8 inches in the Si Sedan versus the previous generation Civic Si models.

All important systems and controls in the Civic are positioned within easy reach of the driver. Controls for the systems used most frequently - audio, cruise control, Bluetooth®3 HandsFreeLink® and intelligent Multi-Information Display - are conveniently positioned on the Si's leather-wrapped steering wheel. The main instrumentation is an easy-to-read analog design, supplemented with digital and graphic displays. Typical of Honda interior design, the soft-touch switchgear of the Civic is engineered to deliver a high-quality feel and positive action.

Interior Color

The Civic Si's performance oriented interior is offered in black fabric with black/gray carbon-pattern inserts on the front seats, highlighted by red stitching. Carbon-look trim and titanium silver painted accents adorn the instrument panel.

Front Seats

The Civic Si's unique front bucket seats are designed to provide welcoming support for a wide range of body types, along with enhanced secure lateral support for aggressive cornering. Compared to the seats in other Civic models, the Si special seats feature added internal side structures in the base and seatback to better support the expanded side bolsters and integrated head restraints. Red stitched "Si" logos in the seatbacks also set them apart.

New seat frame designs are 17-percent lighter compared to the previous generation Si, and are more comfortable and more adjustable. A relocated seatback recline pivot point improves comfort, and the range of the seat bottom height adjustment has been increased by 10mm (0.4 in). To help improve the forward view and create a feeling of openness for rear seat passengers, the front seatbacks have a narrower upper profile and smaller integrated headrests. The Civic Si seats feature fabric seating surfaces for breathability and comfort.

The driver's seat is manually adjustable for fore-and-aft, seatback angle and height adjustment. Additionally, heated front seats are available for the first time on the Civic Si. The 3-level front seat heater controls are positioned within easy reach, just below the climate control system controls.

For easy access to the second row of seating, The Civic Si Coupe passenger-side seat has a convenient one-touch walk-in feature.

Split-Folding Rear Seats

The Civic Si's roomy second-row seating is designed for maximum comfort and versatility, with a folding seatback. In both Coupe and Sedan Si models, a 60/40 split and folding design makes it easy to accommodate passengers or long cargo.

Center Console

The Civic Si interior offers a range of convenient storage features for the driver and passengers. The center console is specially engineered to offer a sporty appearance coupled with versatile usability. With the prevalence of smartphones in most people's lives, the console is engineered around a "tech center" theme. Up front, it has a 2-tier smartphone tray with a wire management pass-through for organized connectivity. A rubber mat helps secure a phone and LED lighting is included for nighttime visibility. There's also an additional phone storage pocket on the driver's side.

An electronic parking brake replaces a conventional manual parking brake lever, freeing up more console space for a larger armrest and greater storage space. The main storage compartment is topped by a sliding, deeply padded armrest. A pair of cup holders are centrally located, and can accommodate large 42-ounce cups when the padded armrest is placed in the rearmost position. By sliding the adjustable cup holder rearward, there's space to accommodate even a large sports drink bottle. Inside the console, a small item tray slides fore and aft the full length of the console. With the cup holder removed, the console offers a class leading 7.2-liters of storage, enough to accommodate iPads and other large items.


The Honda Civic Si Coupe has a trunk capacity of 11.9 cubic feet and the Civic Si Sedan has a trunk capacity of 14.7 cubic feet - both among the largest in the competitive class. Spacious enough to easily accommodate four large golf bags, the trunk areas in both the Si Coupe and Si Sedan are easy to access and use. Inside, the cargo floor is longer front to rear, and the vertical height of the cargo compartment has increased when compared to the previous generation Si models. A 60/40 split and folding rear seatback makes it easy to expand the cargo area. The trunk is carpeted and lined, and a temporary spare is located in a well under a removable section of the cargo-area floor.

Steering Wheel

The leather-wrapped Si steering wheel incorporates the most commonly used controls, allowing the driver to keep their hands on the wheel and their attention on the road. Bluetooth® HandsFreeLink® and audio system controls are located on the left side of the steering wheel, and include a touchpad control that makes is easy to scroll and select items that appear on the audio screen. Cruise control controls are on the right and Driver Information Interface (DII) controls are located on the left side. The steering wheel offers manual tilt and telescopic adjustment.

Shift Lever

Historically, all Civic Si models have had manual transmissions, to give the driver maximum control for performance driving. In the 2017 Civic Si the shift knob is crafted from aluminum alloy and leather, for a performance look and feel. The drive mode selector button nearby lets the driver choose between NORMAL and SPORT driving modes.

Power Windows, Lock and Mirrors

Power windows are standard equipment on all Si models and include auto-up and -down operation on the driver's and front passenger's windows. Power door locks and power mirrors are also standard equipment on all Si models and include heated exterior mirrors. Smart entry is also standard.

Climate Control Systems

All Civic Si models have a standard automatic climate control system now featuring a refrigerant with a much lower GWP (Global Warming Potential). To help conserve energy, the system employs a Variable Displacement Compressor (VDC). Unlike a conventional compressor which can only operate at 100-percent and must be switched on and off frequently to conserve fuel when the cooling load is relatively low, the VDC can vary its output based on the cooling needs, resulting in greater efficiency, reduced drag on the engine and smoother climate-control performance.

For the optimal comfort of both the driver and front-seat passenger the system features dual-zone operation. In addition to physical controls, the Display Audio touchscreen also incorporates climate control functions.

Sliding Sunvisors

To provide more flexible shading from the sun, all Civics Si models come standard with sliding sunvisors. The driver and front passenger sunvisors can now be moved along their mounting shafts, with 3.9 inch range of motion, to provide perpendicular shade for the eyes even when the front seats are in their rear-most position.


All Si models have a unique red-themed central Thin-Film Transistor (TFT) Driver Information Interface (DII) color display that depicts an analog tachometer, digital speedometer and additional selectable information. The instrumentation offers two distinct looks, depending on which drive mode has been selected using the console-mounted switch, NORMAL or SPORT.

In SPORT mode, the Ambient Meter (located above the Driver Information Interface) illuminates Red and flashes as the engine nears the rev-limit.

Driver Information Interface (DII)

The Civic Si instrument panel provides important vehicle information via a Driver Information Interface (DII) positioned centrally in the meter panel. Controls positioned on the left side of the steering wheel allow the driver to cycle the DII display through multiple screens of information.

On the 2017 Civic Si, the Driver Information Interface includes a range of selectable real-time information designed to support performance driving. The 7-inch TFT screen can display throttle input and brake input application in a graphic percentage format, turbocharger boost in pounds per square inch (psi), a race-inspired Rev-limit indicator, a graphical G-Force gauge providing a representation of acceleration, braking and cornering forces, and a lap timer (intended for use on closed circuits). The lap timer is activated using the directional pad on the left side of the steering wheel.


For the first time in Civic Si history, an advanced turbocharged engine powers the Honda Civic Si Coupe and Si Sedan. An enhanced version of the 1.5-liter 16-valve DOHC direct-injected turbocharged powerplant that powers EX-T, EX-L and Touring Civics, the new Si engine pushes performance on multiple fronts. It's rated at 205 hp at 5700 rpm and offers an impressive 192 lb-ft. of torque between 2100 and 5000 rpm. That's an increase of 31 hp and 25 lb.-ft. of torque, as compared to other 1.5-liter turbocharged Civic models.

The new Si also marks a bold shift in strategy when compared to the previous generation 2015 Civic Si. With a displacement reduction of 36-percent compared with the normally aspirated 2.4-liter engine that powered the previous Si, the new 1.5-liter engine is lighter, more compact and more efficient. With the help of a sophisticated, electronically controlled, intercooled turbocharging system, the new Si offers the same peak 205 horsepower as its predecessor, but at a lower, much more quickly accessible rpm. More important, the new turbo engine offers a decisive peak torque advantage over a far broader rpm range. The result is a highly responsive powertrain that advances the Si's fun-to-drive mission.

Of course, some things have not changed in the new Si. It is still offered exclusively with a 6-speed manual transmission for the maximum in driver control and tactile connection, though the all-new gearbox offers a slicker shift action-and revised ratios to suit the power delivery of the new turbocharged engine. And to help put power to the ground, as in the past, a helical limited-slip front differential is standard.

The Civic Si engine is EPA Tier3/Bin125 and CARB LEV 3/ULEV125 emissions compliant. The new, more efficient engine and transmission, along with improved aerodynamics and a major reduction in running resistance, result in substantially enhanced performance and fuel efficiency, compared to the previous generation (2015) Civic Si 2.4-liter. EPA fuel economy ratings are up across the board:

Turbocharged 1.5-Liter In-Line 4 Cylinder

The Civic Si's new DOHC 1.5-liter engine is the first turbocharged engine ever to be offered in a Si model. Closely related to the 1.5-liter turbocharged engine available in the 2017 Civic EX-T Coupe and Sedan, the Si powerplant is substantially upgraded to deliver an increase of 31 horsepower and 25 lb.-ft. of torque. With direct injection, low-inertia high-flow mono scroll turbo system with electrical waste-gate and dual Variable Valve Timing Control (VTC), the turbocharged Civic Si powerplant develops the horsepower and torque of a much larger engine.

Compared to the significantly larger normally-aspirated 2.4-liter engine that was standard in the previous-generation Civic Si (model year 2015), the 2017 Si engine develops the same peak horsepower (205) but at a much lower and more quickly accessible rpm (5700 rpm compared to 7000 rpm). The new Si also develops 18 lb.-ft. more peak torque (192), and delivers it over a far greater engine speed range. In the new Si, peak torque hits at just 2100 rpm-less than half the engine speed (4400 rpm) of the previous generation 2.4-liter engine.

Specifically engineered for direct injection and turbocharging, the Si powerplant is designed to offer very high torque output from 2,100 rpm to 5,000 to maximize responsiveness and acceleration without the need for high engine revs. The Si's highly accessible power delivery is a key feature of its immediate power delivery and fun-to-drive nature.

The turbocharged Si 1.5-liter engine is designed to operate on premium unleaded fuel and is rated at 205 horsepower at 5,700 rpm and 192 lb.-ft of torque between 2,100 and 5,000 rpm (SAE net). The Civic Si is rated by the EPA at 28/38/32 mpg.

Cylinder Block and Crankshaft

The Civic Si's new 1.5-liter inline four has a lightweight die-cast aluminum block with individual reinforced main bearing caps to minimize weight. Cast-in iron cylinder liners provide long-lasting durability. Each journal on the lightweight forged-steel crankshaft is micropolished to reduce internal friction.

Pistons and Connecting Rods

The 1.5-liter engine's pistons help maintain stable combustion and contribute to improved efficiency with "cavity-shaped" crowns. The lightweight pistons have a carefully optimized skirt design to minimize reciprocating weight, which minimizes vibration and increases operating efficiency. The pistons are cooled by twin oil jets directed at the underside of each piston crown. A cooling gallery cast into the circumference of each piston helps provide superior heat resistance. Ion-plated piston rings help reduce friction for greater operating efficiency. Lightweight, high-strength steel connecting rods are heat-forged in one piece and then "crack separated" to create a lighter and stronger rod with an optimally fitted bearing cap.

Cylinder Head and Valvetrain

The direct-injected Civic Si 4-cylinder turbocharged engine has a lightweight DOHC cylinder head that is made of pressure-cast aluminum alloy. With exhaust port cast directly into the cylinder head, the need for a traditional separate exhaust manifold is eliminated. Compared to other 1.5-liter Civic turbocharged engines, which have a 10.6:1 compression ratio, the Civic Si has a lowered 10.3:1 ratio to allow it to reliably operate at a higher maximum boost pressure of 20.3 psi (16.5 psi on Civic EX-T).

A low-friction, silent-chain drives dual overhead cams and four valves per cylinder. The cam drive is maintenance free throughout the life of the engine. To help further reduce weight, thin-wall hollow camshafts are used.

To benefit fuel efficiency, emissions and power, the turbo engine utilizes sodium-filled exhaust valves. A hollow chamber within the valve contains sodium that is cooled by the exhaust-port cooling jacket. As the chamber reaches close to the valve head, the sodium helps to cool the entire valve. As the valve is internally cooled it doesn't need the enriched fuel mixture that was generally used in turbo engines to help cool the exhaust valve. The resultant leaner mixture reduces emissions, increases fuel efficiency and helps increase power.

The cylinder head includes smaller M12 sparkplugs, down from the more common M14, to save space and weight. The head also includes direct-injection multi-hole fuel injectors with a small diameter bore. Higher-pressure direct injection optimizes fuel atomization, allowing for more efficient combustion. To provide a high-tumble intake charge that further enhances combustion efficiency, both the intake port and piston crown have special designs.

The Civic Si turbocharged engine features Variable Valve Timing Control (VTC) that can vary the timing of both the intake and exhaust camshafts independently. With the turbo engine's variable cam timing, the cam timing can be optimized to suit the driving conditions. Under light loads, valve overlap can be increased to reduce pumping losses and improve fuel efficiency. When engine speed is low and engine load is large, such as during initial acceleration, the amount of overlap is increased to boost the scavenging effect, which improves torque and responsiveness. When engine speed is high and engine load is also high, such as during full-throttle acceleration, the amount of valve overlap is reduced to increase engine output by improving both intake and scavenging.

Direct Injection System

The direct-injection system enables increased torque across the engine's full operating range along with higher fuel efficiency. The system features a compact, high-pressure, direct-injection pump that allows both high fuel flow and pulsation suppression, while variable pressure control optimizes injector operation. A multi-hole injector delivers fuel directly into each cylinder (not to the intake port, as in conventional port fuel injection designs), allowing for more efficient combustion.

The multi-hole injectors can create the ideal stoichiometric fuel/air mixture in the cylinders for good emissions control. Theoretically, a stoichiometric mixture has just enough air to completely burn the available fuel. Based on the operating conditions, the direct-injection system alters its function for best performance. Upon cold engine startup, fuel is injected into the cylinders on the compression stroke. This creates a weak stratified charge effect that improves engine start-up and reduces exhaust emissions before a normal operating temperature is reached.

Once the engine is fully warmed up, fuel is injected during the intake stroke for maximum power and fuel efficiency. This helps create a more homogeneous fuel/air mix in the cylinder that is aided by the high-tumble intake port design. This improves volumetric efficiency, and the cooling effect of the incoming fuel improves anti-knock performance.

Low Inertia Mono Scroll High-Flow Turbo System with Electronic Wastegate

The turbocharged Civic Si engine employs a unique high-flow, high capacity turbo for maximum responsiveness. The Mono scroll housing design helps the turbo build boost even at relatively small throttle openings and low rpm. The electrically actuated wastegate allows boost pressure to be precisely controlled. With its lower compression ratio, the Civic Si's maximum boost pressure has been elevated to 20.3 psi (from 16.5 psi in Civic EX-T), substantially increasing maximum horsepower and torque.

A large air low-restriction intercooler is positioned low in the front of the car where it receives unobstructed airflow when the vehicle is in motion. Intake air travels from the air filter, to the turbo compressor, on to the intercooler, then to the engine's intake ports. The intercooler helps reduce the temperature of air entering the engine, making it denser for greater performance. To reduce weight, the turbo system is plumbed with rigid, lightweight resin composite inlet pipes to carry intake air to and from the intercooler.

Friction Reducing Technology

The Civic Si's engine makes use of friction-reducing technologies designed to improve engine efficiency. The outer skirts of lightweight aluminum pistons feature a low-friction coating applied in a unique pattern application. The result is reduced overall friction as the pistons move within the cylinder bores. Plateau honing further lowers the friction level between the pistons and the cylinders by creating an ultra-smooth surface. Plateau honing is a 2-stage machining process that uses two grinding processes instead of the more conventional single honing process. This also enhances the long-term wear characteristics of the engine. Low viscosity oil (0W-20) also reduces friction. Other contributors to overall operating efficiency are a special two-stage oil pump relief valve, low-friction oil seals, special low-drag piston ring design, low-friction cam chain and a lightweight crankshaft.

Drive-by-Wire Throttle System

The Civic Si's Drive-by-Wire throttle system replaces a conventional throttle cable with smart electronics that "connect" the accelerator pedal to a throttle valve inside the throttle body. The result is less under-hood clutter and lower weight, as well as quicker and more accurate throttle actuation. Plus, a specially programmed "gain" rate between the throttle pedal and engine offers improved drivability and optimized engine response to suit specific driving conditions.

Honda's Drive-by-Wire throttle system evaluates the current driving conditions by monitoring throttle pedal position, throttle valve position, engine speed (rpm) and road speed. This information is used to define the throttle control sensitivity that gives the Civic Si's throttle pedal a predictable and responsive feel that meets driver expectations.

With the Civic Si's drive mode selector positioned on the center console, the driver can choose between NORMAL and SPORT modes. In SPORT mode, the Si's Drive-by-Wire throttle system has a more aggressive profile targeted at performance driving.

Emissions Control

The Civic Si's engine meets the tough EPA Tier3/Bin125 and CARB LEV 3/ULEV125 emissions standards, and is certified to this level of emissions performance for 150,000 miles.

100,000+/- Mile Tune-up Intervals

The Civic Si's powerplant requires no scheduled maintenance for 100,000+/- miles or more, other than periodic inspections and normal fluid and filter replacements. The first tune-up includes water pump inspection, valve adjustment, and the installation of new spark plugs.

Maintenance Minder™ System

To eliminate unnecessary service stops while ensuring that the vehicle is properly maintained, the Civic Si has a Maintenance Minder™ system that continually monitors the vehicle's operating condition. When maintenance is required, the driver is alerted via a message on the Driver Information Interface (DII).

6-Speed Manual Transmission

In keeping with the Si's enthusiast driver tradition, just one transmission is available, a quick-shifting 6-speed manual transmission (6MT). The unit offers smooth and precise shift feel and great efficiency. Compared to the closely related 6-speed manual transmission offered in the Civic EX-T, the Si transmission has more rigid bracket mounts to match the engine's higher horsepower and torque. Refinements to the shift linkage and selector mechanism produce a precise and smooth gear lever shift action while reducing stroke by 10 percent.

The 10th-generation Civic 6-speed manual transmission has been carefully engineered to deliver state-of-the-art performance and shift action, with reduced internal friction, tighter internal tolerances and improved synchronizers. The transmission also has a more rigid aluminum exterior case, higher-capacity ball bearings, stiffer gear shafts, and greater torque capacity - compared to the previous Civic Si transmission. A constant-mesh helical reverse gear mechanism significantly reduces noise when reverse is selected. A reverse lockout feature prevents the transmission from accidentally being shifted into reverse while the car is moving forward.


Using the 10th-generation Civic EX-T chassis as a starting point, the 2017 Honda Civic Si Coupe and Si Sedan add significant technological and operational bandwidth, creating a pair of new models that expand the Civic Coupe and Sedan's dynamic envelope. The MacPherson strut front and multi-link rear suspension are upgraded with firmer settings and benefit from the first application of an Adaptive Damper System (ADS) to Civic. Integral to Civic Si's driving mode system, ADS lets the driver select the damping characteristics of the suspension to suit their pleasure - smooth and easy city driving in NORMAL mode (the default setting whenever the Civic Si is started) or taut and direct handling response in SPORT mode.

Linked to the ADS function, when in SPORT mode the Civic Si's steering function firms up the dual-pinion variable-ratio electric power-assisted rack-and-pinion steering (EPS), adding a higher level of feedback and feel for the driver. Larger front and rear disc brakes, Civic Si exclusive 18-inch aluminum alloy wheels and tenacious 235/40R18 tires (all-season standard with summer tires available) likewise expand the Si's performance envelope. Shared with other 2017 Civic models are convenient Straight Driving Assist, Agile Handling Assist, an Electric Parking Brake (EPB) with Automatic Brake Hold, and more.

Front and Rear Suspension

Specially equipped with an Adaptive Damper System, the Civic Si front and rear suspension system provides inspired handling that puts the Civic Si at the top of its class, and in the league of benchmarked European competitors, on city streets as well as on the most challenging winding roads. Front MacPherson struts optimize component packaging and crash performance, while a rear multi-link system helps maximize second-row seating and cargo space - all while also providing inspired handling characteristics. Front and rear stabilizer bars improve turn-in response while reducing body roll during cornering. The stabilizer bars are bonded to their mounting bushings and use low-friction connecting links for smoother operation.

MacPherson Strut Front Suspension

The MacPherson strut front suspension is engineered to provide a highly responsive and engaging driving experience. Performance-calibrated geometry ensures a high degree of quickness, precision and stability. The lower suspension arms are connected to the subframe and to the body via solid compliance bushings, which provide the ideal combination of handling responsiveness and precision. All front suspension arms and the front hub carriers are steel, and both Civic Si models use a tubular front stabilizer bar.

Compared to the overall Civic model range, the new Civic Si front suspension has the following differences:

Multi-Link Rear Suspension

The multi-link rear suspension includes stamped-steel arms, cast aluminum hub carriers and a stabilizer bar. Mounted on a rigid subframe, the rear suspension provides highly precise handling in city driving, sport driving and emergency maneuvers, together with a composed, flat ride. The trailing arms are located on the unibody using solid compliance bushings for optimum handling precision. A solid rear stabilizer bar helps provide crisp turn-in along with body roll control.

Compared to the overall Civic model range, the new Civic Si rear suspension has the following differences:

Adaptive Damper System (ADS)

The Civic Si has new Adaptive Dampers that are integrated into the driving mode functions. Similar in appearance to the standard Civic's dampers, the Adaptive Dampers have electronically adjustable hydraulic damping that lets the driving mode automatically fine-tune ride and handling to driver preferences. A button on the center console allows the driver to choose between NORMAL and SPORT modes. As directed by the driving mode controller, an electric actuator integrated into each damper governs hydraulic fluid movement inside the unit. Damper settings are automatically calibrated to the driving mode setting to achieve the following benefits:

Suspension Bushings

In front, the lower control arms pivot uses solid bushings to provide the exacting precision required for sharp, nimble handling. For the front suspension only, a specially ventilated under-cover allows airflow to cool the bushings, ensuring more consistent performance in all ambient temperature conditions, as well as enhanced long-term durability.

An additional duct, located near the middle of the aluminum front under-panel, cools the engine's torque rod bushing, reducing operating temperatures and ensuring greater durability.

Dual-Pinion Variable-Ratio Electric Power-Assisted Rack-and-Pinion Steering

The Electric Power Steering (EPS) incorporates dual-pinion gears and a variable gear ratio for outstanding steering feel and handling performance. Compared to a traditional single-pinion steering system, the dual-pinion EPS utilizes the physical steering input from the driver as well as from a supplemental electric motor. A non-contact torque sensor measures the driver's steering effort and an ECU determines how much electric motor assist to add, with the result being seamless, natural feeling steering in all situations.

The steering ratio is variable over a 17-percent range with a final full off-center ratio of 10.93:1. This provides a quick 2.11 turns lock-to-lock, which minimizes hand movement and steering effort when turning, parking or maneuvering. High steering-mount stiffness and a robust 30mm steering column diameter further enhance steering precision and feel.

The Civic Si models have a larger electric motor and unique EPS tuning in comparison to the other Civic models. In NORMAL mode, the Civic Si's EPS delivers a smooth, natural turning and handling response, which transforms to a noticeably more direct and linear feel when the driving mode is set to SPORT.

An integral part of the Civic Si's standard driving mode system, the Electric Power Steering automatically firms up when the mode is changed to "SPORT" from "NORMAL." The benefit for the Civic Si driver is firmer steering effort and substantially more direct feeling through the wheel.

Straight Driving Assist

Straight Driving Assist reduces the steering effort required when driving on a sloped or crowned road. When the Straight Driving Assist system detects that continuous steering effort is being applied to keep the car driving along a slope, the Electric Power Steering system applies motor assist to reduce driver steering effort to the same level as is required on a flat road.

4-wheel Disc Brakes with ABS, EBD and Brake Assist

Both Civic Si models are equipped with 4-wheel disc brakes with 4-channel ABS, Electronic Brake Distribution (EBD) and Brake Assist. The system provides a comfortable and refined feel at low speeds, predictable and easy operation on the highway, a sporty, fun-to-drive feel on winding roads, and a reassuring high-performance stopping in emergency situations.

The braking system incorporates larger discs than the standard Civic - 12.3-inch diameter ventilated front rotors (1-inch thickness) clamped by single-piston calipers, and 11.1-inch diameter solid rear rotors (0.4-inch thickness) paired with single-piston calipers. Optimized master cylinder and brake-caliper piston diameters contribute to a short, firm pedal stroke and excellent feel, while also helping to maintaining the power of the braking system. The low-friction design of the brake calipers reduces energy losses when the brakes are not in use, directly improving fuel efficiency.

The 4-channel Anti-lock Braking System (ABS) independently modulates braking power at each wheel to help the driver retain steering control during heavy braking. The Brake Assist system recognizes emergency or heavy braking situations and almost instantly applies full braking force when appropriate to help shorten braking distance.

Vehicle Stability Assist™ (VSA®) with Traction Control

Vehicle Stability Assist™ (VSA®) is an Electronic Stability Control system that works in conjunction with the Civic Si's Drive-by-Wire™ throttle and its 4-channel ABS systems to enhance control capability while the vehicle is accelerating, braking, cornering or when the driver makes a sudden maneuver.

In conjunction with the Civic Si's helical limited-slip differential, VSA provides an additional limited-slip effect for the driving wheels by applying braking force to a slipping wheel, thereby redirecting driving force to the wheel with more traction.

The driver can reduce the traction control effectiveness to allow more wheel slip by pressing the VSA button should the vehicle become stuck; ABS remains fully operational at all times.

Agile Handling Assist

Standard on both Civic Si models, Agile Handling Assist selectively uses the vehicle's brakes to improve initial turning response and overall cornering ability. Agile Handling Assist utilizes brake vectoring to improve corner traceability and confident handling feel. By applying braking force to the inside wheels during cornering at high lateral G, the system creates a yaw moment, thus generating more turning force and reducing understeer.

Hill Start Assist

The Hill Start Assist function helps to prevent the vehicle from rolling backwards when the driver switches from the brake pedal to the accelerator pedal while the vehicle is stopped on a hill. Hill Start Assist automatically activates when the vehicle senses a certain incline and is fully stopped in any forward gear when facing up hill or reverse gear when facing downhill. The system uses a longitudinal G-sensor along with a wheel speed sensor to control the hydraulic brake modulator. Hill Start Assist, when activated, will release the brakes when the driver depresses the throttle or if the driver doesn't press the accelerator after a few seconds.

Electric Parking Brake (EPB)

The standard Electric Parking Brake (EPB) is simpler, more convenient and comfortable to use than a traditional parking brake. The EPB also frees up center console space, allowing a higher console and an extended armrest length.

Automatic Brake Hold

When activated, Automatic Brake Hold retains brake pressure when the vehicle comes to a stop such as at a traffic light or in heavy traffic. This frees the driver from continually pressing the brake pedal to maintain the vehicle in a stopped position, a significant improvement in driving enjoyment.

Operating the system requires two simple actions from the driver:

Releasing the clutch pedal while the transmission is in gear releases the brake pressure.

Wheels and Tires

The Honda Civic Si Coupe and Si Sedan ride on P235/40R18 tires - the widest and lowest-profile rubber ever fitted to a production Civic Si - mounted to 18 x 8.0-inch aluminum-alloy wheels. The tires are 20mm wider, and the wheels are one-inch larger in diameter and one-inch wider, than the Civic EX-T models upon which the Civic Si models are based.

The standard tires carry an all-season M+S rating, making them suitable for year-round use in all weather and conditions. The standard Civic Si tire is a Goodyear Eagle Sport All-Season, developed cooperatively with Honda engineers and the tire company. Despite being wider, the tires maintain a low rolling resistance while also helping to reduce road noise and vibration. Available Goodyear Eagle F1 summer tires offer superior handling performance in dry conditions.

Wheel Design

The Civic Si's 18 x 8.0-inch aluminum alloy wheels feature a split 5-spoke design. The wheels are asymmetrical, with their aerodynamically designed spokes uniquely matching the left and right sides of the vehicle for a dynamic, windswept look. The wheels feature a painted gloss black finish with machined silver spoke edges for a high-contrast, dramatic appearance.

Tire Repair Kit

The Civic Si features an easy-to-use tire repair kit in lieu of a spare tire. This reduces weight and increases trunk volume, and simplifies temporary repairs in the event of a flat tire. Honda Roadside Assistance supports tire repairs. In addition, a T125/70R17 space- and weight-saving temporary spare tire is available.

Low-Friction Wheel Bearings

Civic Si wheel hubs feature low-friction bearings that measurably reduces rolling resistance, which directly contributes to fuel-efficiency for all models.


The Civic Si uses a dedicated exhaust system. Twin rear-mounted silencers and a single center exhaust outlet improves gas flow, helping to enable the higher power output of the turbocharged engine, while also creating a more powerful exhaust sound in mid- and high-rpm ranges. A bright finisher adds visual appeal at the rear of the vehicle.

Fuel Tank

The 12.4-gallon fuel tank and fuel lines are molded of high-density polyethylene for low weight, freedom from corrosion, impact resistance and resistance to fuel vapor losses. The tank and filler pipe are formed as a single unit, reducing weight and complexity, while further improving safety in the event of a collision. Additionally, the tank is positioned ahead of the rear wheels to help guard against collision damage. A high-efficiency fuel pump is housed inside the tank, and the fuel filter is a lifetime design that never needs replacement. An integrated baffle system positioned inside the tank reduces the sound of fuel sloshing.

Tire Pressure Monitoring System (TPMS)

Both 2017 Civic Si models use an indirect Tire Pressure Monitoring System (TPMS), which uses the ABS wheel-speed sensors to continually monitor the rotational speed of each wheel. Because a tire with low pressure rotates more quickly than one with a higher pressure, by comparing these values with a specifically designed computer algorithm, indirect TPMS can determine when a tire is low on pressure. When this occurs, a symbol illuminates on the instrument panel warns the driver. Special logic included in the TPMS processor is designed to eliminate false warnings.

Comfort and Convenience

Like other 10th Generation Civic models, the Civic Si Coupe and Sedan offer an elevated level of comfort and convenience with a host of standard premium features. From the convenience of Smart Entry and Pushbutton Start/Stop to the ease of use of the electric parking brake and Hill Start Assist, the Honda Civic Si Coupe and Sedan offer useful technologies that make driving easier and more convenient.

Smart Entry and Push Button Start/Stop

The 2017 Civic Si offers the upscale convenience of keyless Smart Entry and Push Button Start/Stop.

Smart Entry

Smart Entry also allow

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