Honda Automobiles: Honda Civic Si

Using a 10th-generation Civic EX-T framework as a starting point, a 2017 Civic Si Coupe and Si Sedan supplement poignant technological and operational bandwidth, formulating a span of new models that raise a Civic Coupe and Sedan’s energetic envelope. The MacPherson strut front and multi-link back cessation are upgraded with firmer settings and advantage from a initial focus of an Adaptive Damper System (ADS) to Civic. Integral to Civic Si’s pushing mode system, ADS lets a motorist name a damping characteristics of a cessation to fit their pleasure – well-spoken and easy city pushing in NORMAL mode (the default environment whenever a Civic Si is started) or frozen and approach doing response in SPORT mode.

Linked to a ADS function, when in SPORT mode a Civic Si’s steering duty firms adult a dual-pinion variable-ratio electric power-assisted rack-and-pinion steering (EPS), adding a aloft turn of feedback and feel for a driver. Larger front and back front brakes, Civic Si disdainful 18-inch aluminum amalgamate wheels and devoted 235/40R18 tires (all-season customary with summer tires available) serve raise a Si’s opening envelope. Shared with other 2017 Civic models are accessible Straight Driving Assist, Agile Handling Assist, an Electric Parking Brake (EPB) with Automatic Brake Hold, and more.

Key Chassis Features

Civic Si Coupe and Si Sedan

  • Specially tuned MacPherson strut front suspension
  • Specially tuned Multi-link back suspension
  • Two-mode Adaptive Damper System (ADS)*
  • Specially tuned front and back stabilizer bars
  • Solid cessation correspondence bushings (front and rear)
  • 12.3-inch front, 11.1-inch back power-assisted front brakes*
  • 4-channel Anti-lock Braking System (ABS) with Brake Assist
  • Electronic Brake force Distribution (EBD)
  • Vehicle Stability Assist™ (VSA®) with Traction Control
  • Agile Handling Assist*
  • Dual-Pinion Variable-Ratio Electric Power-Assisted Steering (EPS)*
  • Straight Driving Assist*
  • Electric Parking Brake (EPB) with Automatic Brake Hold*
  • Hill Start Assist*
  • Indirect Tire Pressure Monitoring System (TPMS)
  • 18-inch amalgamate wheels
  • 235/40R18* all-season tires (summer tires available)

* First for Civic Si

Front and Rear Suspension
Specially versed with an Adaptive Damper System (see below), a Civic Si front and back cessation complement provides desirous doing that puts a Civic Si during a tip of a class, and in a joining of benchmarked European competitors, on city streets as good as on a many severe circuitous roads. Front MacPherson struts optimize member wrapping and pile-up performance, while a back multi-link complement helps maximize second-row seating and load space – all while also providing desirous doing characteristics. Front and back stabilizer bars urge turn-in response while shortening physique hurl during cornering. The stabilizer bars are connected to their ascent bushings and use low-friction joining links for smoother operation.

MacPherson Strut Front Suspension

The MacPherson strut front cessation is engineered to yield a rarely manageable and enchanting pushing experience. Performance-calibrated geometry ensures a high grade of quickness, pointing and stability. The revoke cessation arms are connected to a subframe and to a physique around plain correspondence bushings, that yield a ideal multiple of doing responsiveness and precision. All front cessation arms and a front heart carriers are steel, and both Civic Si models use a tubular front stabilizer bar.


Compared to a altogether Civic indication range, a new Civic Si front cessation has a following differences:

  • 7-percent stiffer open rate
  • Adaptive Damper System (ADS)
  • 18-percent stiffer top check mounts
  • 7-percent stiffer stabilizer bar rate

Multi-Link Rear Suspension
The multi-link back cessation includes stamped-steel arms, expel aluminum heart carriers and a stabilizer bar. Mounted on a organisation subframe, a back cessation provides rarely accurate doing in city driving, competition pushing and puncture maneuvers, together with a composed, prosaic ride. The trailing arms are located on a unibody regulating plain correspondence bushings for best doing precision. A plain back stabilizer bar helps yield frail turn-in along with physique hurl control.

Compared to a altogether Civic indication range, a new Civic Si back cessation has a following differences:

  • 32-percent stiffer open rate
  • Solid front and back correspondence bushings (rear common with Civic Type R)
  • Adaptive Damper System (ADS)
  • High-stiffness top control arms – common with Civic Type R
  • 26-percent stiffer stabilizer bar rate

Adaptive Damper System (ADS)
The Civic Si has new Adaptive Dampers that are integrated into a pushing mode functions. Similar in appearance to a customary Civic’s dampers, a Adaptive Dampers have electronically tractable hydraulic damping that lets the pushing mode automatically fine-tune ride and doing to motorist preferences. A pitch on a core console allows a motorist to select between NORMAL and SPORT modes. As destined by a pushing mode controller, an electric actuator integrated into any check governs hydraulic fluid movement inside a unit. Damper settings are automatically calibrated to a pushing mode environment to grasp a following benefits:

  • NORMAL – Provides an ideal bland change of float and doing for a far-reaching operation of conditions.
  • SPORT – Firmer check settings squash and stabilise a automobile physique during fast steering inputs and maneuvers, that noticeably improves pleasing feel, doing pointing and altogether responsiveness.

Suspension Bushings
In front, a revoke control arms focus uses plain bushings to yield a harsh pointing compulsory for sharp, nimble handling. For a front cessation only, a privately ventilated under-cover allows airflow to cold a bushings, ensuring some-more unchanging opening in all ambient heat conditions, as good as extended long-term durability.

An additional duct, located nearby a core of a aluminum front under-panel, cools a engine’s torque rod bushing, shortening doing temperatures and ensuring incomparable durability.

Dual-Pinion Variable-Ratio Electric Power-Assisted Rack-and-Pinion Steering
The Electric Power Steering (EPS) incorporates dual-pinion gears and a non-static rigging ratio for superb steering feel and doing performance. Compared to a normal single-pinion steering system, a dual-pinion EPS utilizes a earthy steering submit from a motorist as good as from a supplemental electric motor. A non-contact torque sensor measures a driver’s steering bid and an ECU determines how most electric engine support to add, with a outcome being seamless, healthy feeling steering in all situations.

The steering ratio is non-static over a 17-percent operation with a final full off-center ratio of 10.93:1. This provides a discerning 2.11 turns lock-to-lock, that minimizes palm transformation and steering bid when turning, parking or maneuvering. High steering-mount rigidity and a strong 30mm steering mainstay hole serve raise steering pointing and feel.

The Civic Si models have a incomparable electric engine and singular EPS tuning in comparison to a other Civic models. In NORMAL mode, a Civic Si’s EPS delivers a smooth, healthy branch and doing response, that transforms to a noticeably some-more approach and linear feel when a pushing mode is set to SPORT. (See a Powertrain territory for some-more information.)

An constituent partial of a Civic Si’s customary pushing mode system, a Electric Power Steering automatically firms adult when a mode is altered to “SPORT” from “NORMAL.” The advantage for a Civic Si motorist is firmer steering bid and roughly some-more approach feeling by a wheel.

Straight Driving Assist
Straight Driving Assist reduces a steering bid compulsory when pushing on a sloped or crowned road. When a Straight Driving Assist complement detects that continual steering bid is being practical to keep a automobile pushing along a slope, a Electric Power Steering complement relates engine support to revoke motorist steering bid to a same turn as is compulsory on a prosaic road.

4-wheel Disc Brakes with ABS, EBD and Brake Assist
Both Civic Si models are versed with 4-wheel front brakes with 4-channel ABS, Electronic Brake Distribution (EBD) and Brake Assist. The complement provides a gentle and polished feel during low speeds, predicted and easy operation on a highway, a sporty, fun-to-drive feel on circuitous roads, and a calming high-performance interlude in puncture situations.

The braking complement incorporates incomparable discs than a customary Civic – 12.3-inch hole ventilated front rotors (1-inch thickness) clamped by single-piston calipers, and 11.1-inch hole plain back rotors (0.4-inch thickness) interconnected with single-piston calipers. Optimized master cylinder and brake-caliper piston diameters minister to a short, organisation pedal cadence and glorious feel, while also assisting to progressing a appetite of a braking system. The low-friction pattern of a stop calipers reduces appetite waste when a brakes are not in use, directly improving fuel efficiency.

The 4-channel Anti-lock Braking System (ABS) exclusively modulates braking appetite during any circle to assistance a motorist keep steering control during complicated braking. The Brake Assist complement recognizes puncture or complicated braking situations and roughly now relates full braking force when suitable to assistance digest braking distance. (See a Safety and Driver Assistive territory for some-more information.)

Vehicle Stability Assist™ (VSA®) with Traction Control
Vehicle Stability Assist™ (VSA®) is an Electronic Stability Control complement that works in and with a Civic Si’s Drive-by-Wire™ stifle and a 4-channel ABS systems to raise control capability while a automobile is accelerating, braking, cornering or when a motorist creates a remarkable maneuver.

In and with a Civic Si’s scrolled limited-slip differential, VSA provides an additional limited-slip outcome for a pushing wheels by requesting braking force to a slipping wheel, thereby redirecting pushing force to a circle with some-more traction.

The motorist can revoke a traction control efficacy to concede some-more circle trip by dire a VSA pitch should a automobile turn stuck; ABS stays entirely operational during all times. (See a Safety and Driver Assistive territory for some-more information.)

Agile Handling Assist
Standard on both Civic Si models, Agile Handling Assist selectively uses a vehicle’s brakes to urge initial branch response and altogether cornering ability. Agile Handling Assist utilizes stop vectoring to urge dilemma traceability and assured doing feel. By requesting braking force to a inside wheels during cornering during high parallel G, a complement creates a bend moment, so generating some-more branch force and shortening understeer.

Hill Start Assist
The Hill Start Assist duty helps to forestall a automobile from rolling retrograde when a motorist switches from a stop pedal to a accelerator pedal while a automobile is stopped on a hill. Hill Start Assist automatically activates when a automobile senses a certain slip and is entirely stopped in any brazen rigging when confronting adult mountain or retreat rigging when confronting downhill. The complement uses a longitudinal G-sensor along with a circle speed sensor to control a hydraulic stop modulator. Hill Start Assist, when activated, will recover a brakes when a motorist depresses a stifle or if a motorist doesn’t press a accelerator after a few seconds.

Electric Parking Brake (EPB)
The customary Electric Parking Brake (EPB) is simpler, some-more accessible and gentle to use than a normal parking brake. The EPB also frees adult core console space, permitting a aloft console and an extended armrest length.

Automatic Brake Hold 
When activated, Automatic Brake Hold retains stop vigour when a automobile comes to a stop such as during a trade light or in complicated traffic. This frees a motorist from ceaselessly dire a stop pedal to say a automobile in a stopped position, a poignant alleviation in pushing enjoyment.

Operating a complement requires dual elementary actions from a driver:

  • Activating/deactivating a complement around a switch on a core console
  • Pressing on a stop pedal until a automobile comes to a stop

Releasing a purchase pedal while a delivery is in rigging releases a stop pressure.

Wheels and Tires
The Civic Si Coupe and Si Sedan float on P235/40R18 tires – a widest and lowest-profile rubber ever propitious to a prolongation Civic Si – mounted to 18 x 8.0-inch aluminum-alloy wheels. The tires are 20mm wider, and a wheels are one-inch incomparable in hole and one-inch wider, than a Civic EX-T models on that a Civic Si models are based.

The customary tires lift an all-season M+S rating, creation them suitable for year-round use in all continue and conditions. The customary Civic Si tire is a Goodyear Eagle Sport All-Season, grown cooperatively with Honda engineers and a tire company. Despite being wider, a tires say a low rolling insurgency while also assisting to revoke highway sound and vibration. Available Goodyear Eagle F1 summer tires offer aloft doing opening in dry conditions.

Wheel Design
The Civic Si’s 18 x 8.0-inch aluminum amalgamate wheels underline a separate 5-spoke design. The wheels are asymmetrical, with their aerodynamically designed spokes singly relating a left and right sides of a automobile for a dynamic, windswept look. The wheels underline a embellished shimmer black finish with machined china spoke edges for a high-contrast, thespian appearance.

A outline of a 2017 Civic Si Coupe and Si Sedan’s circle and tire sizes includes:

Civic Si Coupe

  • 18-inch amalgamate wheels
  • 235/40R18 all-season tires
  • Available 235/40R18 summer tires

Civic Si Sedan

  • 18-inch aluminum wheels
  • 235/40R18 all-season tires
  • Available 235/40R18 summer tires

Tire Repair Kit
The Civic Si facilities an easy-to-use tire correct pack in lieu of a gangling tire. This reduces weight and increases case volume, and simplifies proxy repairs in a eventuality of a prosaic tire. Honda Roadside Assistance supports tire repairs. In addition, a T125/70R17 space- and weight-saving proxy gangling tire is available.

Low-Friction Wheel Bearings
Civic Si circle hubs underline low-friction orientation that measurably reduces rolling resistance, that directly contributes to fuel-efficiency for all models.

The Civic Si uses a dedicated empty system. Twin rear-mounted silencers and a singular core empty opening improves gas flow, assisting to capacitate a aloft appetite outlay of a turbocharged engine, while also formulating a some-more absolute empty sound in mid- and high-rpm ranges. A splendid finisher adds visible interest during a back of a vehicle. (See a Powertrain territory for some-more information.)

Fuel Tank
The 12.4-gallon fuel tank and fuel lines are molded of high-density polyethylene for low weight, leisure from corrosion, impact insurgency and insurgency to fuel fog losses. The tank and filler siren are shaped as a singular unit, shortening weight and complexity, while serve improving reserve in a eventuality of a collision. Additionally, a tank is positioned forward of a back wheels to assistance ensure opposite collision damage. A high-efficiency fuel siphon is housed inside a tank, and a fuel filter is a lifetime pattern that never needs replacement. An integrated perplex complement positioned inside a tank reduces a sound of fuel sloshing.

Tire Pressure Monitoring System (TPMS)
Both 2017 Civic Si models use an surreptitious Tire Pressure Monitoring System (TPMS), that uses a ABS wheel-speed sensors to ceaselessly guard a rotational speed of any wheel. Because a tire with low vigour rotates some-more fast than one with a aloft pressure, by comparing these values with a privately designed mechanism algorithm, surreptitious TPMS can establish when a tire is low on pressure. When this occurs, a pitch illuminates on a instrument row warns a driver. Special proof enclosed in a TPMS processor is designed to discharge fake warnings.

Chassis Features

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