Honda Automobiles: Honda Civic Si

The new Si Coupe and Si Sedan lapse a sporty Si indication name to a Civic lineup for a initial time given indication year 2015. To a worldly Civic Coupe and Sedan exterior, a Civic Si models supplement assertive and jaunty extraneous facilities that are visually sparkling as good as aerodynamically functional. In front are a particular gloss-black “solid wing” grille and headlight surrounds, singular Si badging, a racing-inspired fascia with a incomparable revoke atmosphere intake. Unique 18-inch aluminum amalgamate wheels, low-profile 235/40R18 tires and a subtly longer and revoke position conclude a Si as a special multiply of Civic. While in back, a decklid wing spoiler (elevated on a Si Coupe), singular back fascia, core empty opening with splendid hexagonal finisher and Si badging serve brand a new indication as opening art.

The new front and back fascias, together with a back spoilers and a Civic’s already endless underbody aerodynamic tailoring, helps a Civic Si trip by a atmosphere with minimal lift and drag during aloft speeds. Lighting on both Si models includes LED daytime regulating lights (DRL), projector-beam headlights and haze lights, and LED taillights. Based on a Civic EX-T, a new Si models also underline a high spin of reward facilities including an acoustic windshield, a one-touch appetite moonroof with lean feature, exhilarated appetite side mirrors, Smart Start/Entry, a Walk Away Auto Lock® feature, and more.

Key Body and Exterior Features 

  • Advanced Compatibility Engineering™ (ACE™) physique structure with pile-up cadence front support design*
  • Acoustic-glass, flush mounted windshield
  • Acoustically hermetic unibody
  • Full underbody covering*
  • Projector-beam halogen headlights with Auto-On/Off
  • LED daytime regulating lights (DRL)*
  • LED taillights*
  • Honda LaneWatch™
  • One-touch appetite moonroof with lean feature
  • Smart Entry and Push Button Start/Stop
  • Decklid wing spoiler
  • Civic Si badges on decklid and grille
  • Center empty opening with chrome finisher*
  • 18-inch amalgamate wheels
  • 235/40R18* all-season tires (summer tires available)

* First for Civic Si

Exterior Dimensions
The 2017 Civic Si Coupe extraneous magnitude describe likewise to those of a Civic EX-T Coupe, and both cars share their 106.3-inch wheelbase and 70.8-inch altogether breadth with a EX-T Sedan and Si Sedan. In comparison to a EX-T Coupe, during 177.4 inches overall, a new Si Coupe is 0.5-inch longer due to a restyled front and back fascias, and during 54.7 inches, it is also 0.2-inch revoke due to a lower-profile 18-inch tires. The Civic Si Coupe’s circle lane is incompletely narrower during 60.5 inches front, 61.2 inches rear.

The 2017 Civic Si Sedan shares several pivotal extraneous magnitude with a Civic EX-T Sedan, including a 106.3-inch wheelbase and 70.8-inch altogether width. From here on, a new Civic Si Sedan extraneous differs subtly in a other measurements: a 182.8-inch altogether length is 0.5-inch longer than a Civic EX-T Sedan, due to a singular front and back fascia designs; and a lower-profile 18-inch tires make a Si Sedan 0.2-inch revoke in altogether tallness during 55.5 inches. The Civic Si Sedan’s circle lane is incompletely narrower during 60.5 inches front, 61.2 inches rear.

Key Exterior Specifications – Civic EX-T Coupe to Civic Si Coupe Difference

Key Exterior Specifications – Civic EX-T Sedan vs. Civic Si Sedan Difference

(See a Specifications and Features territory for all data.)

Advanced Compatibility Engineering™ (ACE™)

As in all 2017 Civic models, Honda’s disdainful Advanced Compatibility Engineering™ (ACE™) body-structure enhances newcomer insurance and pile-up harmony in frontal collisions in a Civic Si Coupe and Si Sedan. ACE utilizes a network of connected constructional elements to discharge pile-up appetite some-more uniformly via a front of a vehicle, so shortening a army eliminated to a newcomer compartment. ACE channels frontal pile-up appetite to both tip and revoke constructional elements, including a building support rails, side sills and A-pillars.


Crash Stroke
The ACE structure used on a Civic Si facilities a pile-up cadence record grown by Honda engineers in a company’s modernized reserve investigate laboratory in Raymond. Ohio. With this pile-up cadence structure, in a frontal collision a revoke territory of a front car support hinges to approach a engine down and rearward, assisting approach pile-up appetite into a vehicle’s building while also minimizing cabin intrusion. This essential square of reserve engineering effectively adds 80mm (3.2 in) of additional energy-absorbing “crash stroke” to a front of a vehicle.

Besides assisting a Civic Si accept a tip ratings in a severe sovereign pile-up tests, a pile-up cadence structure enabled designers to rise a Civic Si’s physique pattern to underline a brief front overhang and brief hood-line for a singular and sparkling appearance, glorious external prominence and softened handling. (See a Safety and Driver Assistive territory for some-more information.)

High Body Rigidity
The high tortuous and torsional acerbity of a 2017 Civic Si Coupe and Si Sedan physique structures (+25 percent over prior Civic Si) allows for fine-tuning of a vehicles’ cessation systems for higher doing performance. The unbending physique structure allows a framework to work some-more effectively and reduces a cessation movement indispensable to control physique motion. Another advantage of a firm physique structure is a quieter and some-more gentle float for passengers, with rebate Noise, Vibration and Harshness (NVH) felt over a far-reaching operation of pushing conditions.

The localized parallel acerbity of a Si Coupe’s back physique is 4.6 percent stiffer than in a Si Sedan, essentially due to a differences in a back physique design, and this has poignant energetic benefits.

Some pivotal physique structure facilities include:
Under a Hood

  • A revoke stiffener, located behind a engine on a front bulkhead, improves handling

In a Unibody

  • Certain tie areas where a A-pillars accommodate a building sills, and a B-pillars accommodate both a building sills and roof rails, revoke idle quivering and booming
  • Large physique panels are done regulating resource aided engineering (CAE) to revoke booming
  • Gussets positioned inside a back entertain areas of a unibody revoke highway noise
  • An middle back constructional ring stiffens a unibody for softened doing
  • Short-pitch welding places mark welds 20mm (0.8 in) detached in vicious areas of a unibody, compared to 40mm to 45mm (1.6 in to 1.8 in) normal spacing, augmenting acerbity and durability

Underneath a Vehicle

  • The building vessel is done of 590-MPa high-strength steel to yield a lighter nonetheless stronger altogether structure
  • Floor cross-members positioned underneath a motorist and front passenger’s seating area urge float comfort
  • A parallel cross-member and check structure, located between a back wheels, improves doing
  • A cross-car brace, located during a front of a vehicle, improves handling

The Civic Si combines jaunty and sporty styling with modernized aerodynamic facilities to yield a singular and sparkling mix of pattern and functionality. Compared to a Civic EX-T models on that they are based, pivotal aerodynamic sum for a Si Coupe and Si Sedan includes singular front and back fascias, front chin spoiler, and decklid mounted wing spoiler. Above and over a Civic Coupe and Sedan’s inherently fit aerodynamics, a new Civic Si aero package directly reduces fellow of lift (CL) for softened high-speed energetic performance.

As with a other stream Civic models, computational liquid dynamics (CFD) was used to magnitude aerodynamic potency during a pattern phase, followed by scale-model breeze hovel contrast and finally by full-scale wind-tunnel testing. Two vicious aero gains from this routine embody a rebate in engine-room and underbody drag (CdA), that helps urge both fuel potency and interior quietness.

Specially done components during a front of a car lamp airflow by a radiator and into a engine’s cold-air intake, while channeling a remaining airflow over, around and underneath a vehicle. Along with a narrower A-pillars and flush-mounted glass, these minister to a Civic’s fit thoroughfare by a air. The loose slope of a Si Coupe’s back roofline and back window serve improves aerodynamic efficiency.

Underbody Airflow
Along with a other stream Civic models, a new Si Coupe and Si Sedan underline a flattest underbody of any gasoline-powered Honda prolongation vehicle. A molded under-panel is positioned directly underneath a front fascia, uniformly starting a rearward upsurge of atmosphere underneath a vehicle. An aluminum under-tray is positioned underneath a engine and delivery and facilities a channel that allows ambient cooling airflow to a hydraulic engine mount. Dual acoustic fiber side under-panels extend from behind a front wheels to only brazen of a back wheels, serve smoothing a airflow as it travels rearward, while also shortening breeze sound in a newcomer cabin.

Lateral strakes located brazen of any circle and tire (8.5 inches far-reaching in front, and 3.5 inches far-reaching in a rear) assistance inhibit airflow around a tires for additional aerodynamic potency gains.

T-Direction Welding
Applied to a brazen corner of a front doorway hinge pillars, only behind a front circle openings, a “T-direction welding” technique helps a 2017 Civic acquire tip ratings in a severe IIHS Small Overlap Frontal collision test. Instead of regulating parallel overlapping welded joints on a hinge pillars, that would be negatively influenced by a circle relocating rearward and distinguished a post in an equivalent frontal collision, a hinge pillars instead use a longitudinal welded join designed to withstand perfect army generated in such a collision.

Class-leading Forward Visibility
The slight A-pillar territory on a 2017 Civic Si helps yield a class-leading 84.3 degrees of brazen prominence (the angle done by sketch lines from a driver’s eye indicate to a outboard edges of a A pillars). Safety opening is confirmed by a pillars’ shape, a accurate pattern of bucket pathways during a frontal collision or rollover, and a use of 1500 MPa hot-stamped ultra-high-strength steel for a A-pillars.

High-Strength Steel
Multiple steel grades are used in a Civic Si’s physique construction to assistance grasp glorious altogether car dynamics, optimize reserve performance, and revoke NVH. Materials operation from 5 opposite grades of steel, including reward hot-stamp steel and ultra-high-strength steel used in a unibody, to aluminum for a front buffer beam. All were selected to grasp a best multiple of strength, rigidity, energetic opening and light weight. Fully 63 percent of a Si Coupe physique structure is stoical of high-strength steel, while 64 percent of a Si Sedan physique structure is stoical of high-strength steel.

Body Materials

Noise, Vibration and Harshness (NVH) Countermeasures
The latest Civic height takes noise, quivering and rudeness (NVH) countermeasures to a subsequent level, positioning it during a tip of a rival set. Both Civic Si models underline strategically placed physique sealants (see below). Additional NVH enhancements on all models embody acoustic separators inside a A- and B-pillars, while a sound-insulating acoustic windshield (see below) serve aids altogether cabin quietness. (See a Interior territory for some-more information.)

Engine Compartment Isolation
Measures to besiege sound and feverishness emanating from within a engine cell embody dedicated front, side and back hood seals, strategically placed feverishness baffles, a hood insulator panel, an engine undercover, and dedicated insulation within a instrument panel. Inside a vehicle, a one-piece molded insulated runner ship adds serve to well-developed feverishness siege and sound rebate for a 2017 Civic SI.

Acoustic Windshield
Special laminated acoustic potion is used for a Civic Si windshield to assistance revoke sound entering a cabin. Tuned privately to draw wind-noise frequencies, a windshield potion uses an outdoor covering of 2.0mm reserve glass, a 0.7mm thick core covering of acoustic polyvinyl butyral (PVB), and a 1.8mm safety-glass middle covering for a sum density of 4.5mm. This helps a Civic Si place during a tip of a category in wind-noise performance. The windshield also incorporates UV light-absorbing technology. In addition, flush-mounted 4.0mm gradual front doorway potion and 3.5mm gradual back doorway potion assistance revoke breeze sound in a cabin. The one-touch appetite moonroof with lean underline uses 3.5mm coloured and gradual glass.

Sound-absorbing Undercovers
A special perplex picture located underneath a core of a building vessel and felt buffer middle liners serve attenuates breeze and highway noise.

Body Sealing
The 2017 Civic Si has an rare spin of physique sealing to dramatically revoke a levels of sound inside a vehicle. Throughout a unibody are 9.2 sq. in. (coupe) to 9.3 (sedan) of coupling seals and other sealers to revoke quivering and a delivery of noise.

Additional measures include:

  • Pillar separators sign a vale A- and B-pillars to revoke a delivery of sound from a building area into a newcomer cabin.
  • Triple doorway sealing utilizes 360-degree molded doorway seals to revoke breeze sound and urge isolation.
  • New doorway opening seals during a back edges of a doors join triple-sealed doorway openings and revoke door-edge seals in gripping breeze sound from entering a cabin.
  • Multiple atmosphere trickle rebate moldings and clips are used during pivotal locations where a side windows slip into a doors, shortening a probability of heard atmosphere leaks occurring in these locations.
  • Along with middle bracing, acoustic hole seals fill open areas inside a doorway structures, significantly shortening a volume of breeze and highway sound and quivering that can strech a cabin. The same Thinsulate™ element that is used in a doors is also used to revoke sound delivery by a roof, a physique A- and B-pillars, and a back tray.

Body Features

(See a Specifications and Features territory for all data.)

LED Lighting
The 2017 Civic Si incorporates a far-reaching operation of light-emitting diode (LED) extraneous lighting features. These embody customary LED daytime regulating lights (DRL), LED taillights, LED stop lights, LED license-plate light and LED core high-mounted stop light.

Power Side Mirrors
Power side mirrors have a distinguished pattern and their body-colored housings are aerodynamically optimized to revoke breeze sound and minimize turbulence. The mirrors are exhilarated for softened potency in severe continue and can be manually folded for larger preference in parsimonious parking situations.

Honda LaneWatch™
Both Civic Si models embody Honda’s LaneWatch™ arrangement that uses a camera located during a bottom a passenger-side extraneous counterpart to arrangement a wide-angle perspective of a newcomer side alley on a Display Audio screen. The picture appears when a right spin vigilance is activated, or when a symbol on a finish of a spin vigilance petiole is pressed. (See a Safety and Driver Assistive territory for some-more information.)

One-Touch Power Moonroof with Tilt Feature
The Civic Si Coupe and Si Sedan both have a one-touch appetite moonroof with lean underline that will entirely open or tighten with a singular hold of a switch. The moonroof resource was intentionally designed to yield plenty headroom.

Integrated Rear Window Antenna
Bonded onto a back window is a wire-type receiver that is optimized to assistance broach glorious radio accepting but a disastrous impact on car aerodynamics that would be caused by a normal pillar antenna.

Power Windows and Locks
Power windows are customary apparatus on both Civic Si models and embody auto-up and -down operation on a motorist and front passenger’s windows. Power thatch are standard, and a customizable auto-locking underline can be configured regulating a Driver Information Interface and steering wheel-mounted controls.

Smart Entry and Push Button Start/Stop
The new Civic Si Coupe and Si Sedan embody a upscale preference of Smart Entry Push Button Start/Stop. The complement simplifies approaching, entering and handling a Civic Si. To benefit entry, a driver/passenger simply pulls possibly of front doorway handles while a remote in his or her possession. (See a Comfort and Convenience territory for some-more information.)

Windshield Wipers
The Civic Si has non-static few windshield wipers. Designed to cover a limit probable windshield area, a left (driver) and right (front passenger) windshield wipers are 25.5 inches and 18 inches long, respectively. For improved appearance, a wipers are dark low on a front cover when not in operation. The wiper engine uses a built-in ECU that reduces complexity.

Capless Fueling System
The Civic Si’s capless fueling eliminates a fuel cap, definition that fueling a car simply requires opening a fuel lid, refueling, and afterwards shutting a lid. This intelligent and easy-to-use pattern eliminates a need to hold a unwashed fuel cap, reduces a probability of deleterious a vehicle’s paint with a fuel top or tether, or forgetful a fuel top during a gas station.

Exterior Features

* First for Civic Si

(See a Specifications and Features territory for all data.)

Exterior Colors
The 2017 Civic Si Sedan is accessible in 6 extraneous colors including dual lead colors (Lunar Silver Metallic and Aegean Blue Metallic). Meanwhile a new Civic Si Coupe comes in a choice of 7 extraneous colors including dual lead colors (Lunar Silver Metallic and Aegean Blue Metallic) and one disdainful pearl tone (Energy Green Pearl). All colors simulate a jaunty and effusive impression of a new Civic Si models, charity clear contrasts wherever light plays on a body-panel curves and angles, while also charity an disdainful and upscale appearance.

The 2017 Civic Si extraneous colors include:


*Coupe Only

The extraneous tone choices are keyed to a black fabric interior with Si disdainful front seats featuring black/gray carbon-pattern accents and red stitching. (See a Interior territory for some-more information.)