CarX Builder
C4

Grip · FWD

Grip

HC9 (Honda Civic Type R (EK9))

by Greetown · published on 15/10/2026 · 331 views

Use as a base

264

Power

883

Weight

277

Max speed (aero drag)

Inputs

Values used for the calculation

The car data entered for this build. Enter the same values to get the same setup on your car.

Engine

Power (HP)
264
Rev limiter (rpm)
8780
Low torque (Nm)
153
Mid torque (Nm)
168
High torque (Nm)
175
Turbo pressure (bar)
0.39
Fuel
Sport
Peak power (HP)
264 @ 7936 rpm
Peak torque (Nm)
232 @ 7458 rpm
Powerband (dyno)
7697 – 8175 rpm

Chassis

Weight (kg)
883
Front weight balance (%)
62
Center of mass height (inches)
8.3
Wheelbase (m)
2.622
Front track (m)
1.48
Rear track (m)
1.48
Front wheel spacer (cm)
15
Rear wheel spacer (cm)
14

Tires

Front tires
265/40 R16
Rear tires
265/40 R16
Front tire grip (index)
1.08
Rear tire grip (index)
1.08

Aero

Drag coefficient (Cx)
0.3
Air Resistance (Sx)
2.04
Front downforce (kg)
40
Rear downforce (kg)
39

Gearbox

Number of gears
6
Default final drive (ratio)
3.108
Default last gear (ratio)
0.8
Gear spacing
Standard

Spec sheet

Installed parts

Gearbox

T50S

  • Gearbox GBT [P] Prototype
  • Clutch CLH [P] Prototype
  • Differential Clutch 65 Ultimate

Wheels

  • Tyre compound Racing+ Racing
01

Transmission

Final drive 4.299
Gear 1 4.06
Gear 2 2.3
Gear 3 1.6
Gear 4 1.25
Gear 5 1
Gear 6 0.8

Gearbox: T50S (declared by you, in the form or when sharing).

Your gearbox ratios are kept and only the final drive is adjusted, so the last gear reaches top speed at the top of the power band. This is not an optimal gearing: in our simulations on the game's tracks, no other rule does demonstrably better, whatever the discipline. Not validated in game.

Gearbox recalculated on 2026-09-25: corner exit speed and target top speed are no longer used, and the final drive stays within the game's slider range. The proposed ratios, and the differential that depends on them, may differ from those shown before.

02

Differential

Accel lock 0.34
Decel lock 0.17
Preload 86Nm

Values computed for your car and kept within the sliders of your differential (a Clutch 65 if none is declared).

Differential: Clutch 65 (declared).

Stability first: the rear must never let go before the front. Preload keeps the inner wheel from spinning over a bump at the throttle you hold through a typical corner (computed from aero and tyre drag) and keeps the lock smooth between throttle and lift-off. Acceleration lock adds only what is still needed so the inner wheel doesn't spin up to 60 % of your lateral grip: on a rear-wheel drive car, more would push the rear out (in-game hint). Coast lock is half the acceleration lock (1.5-way), gentle so the car doesn't rotate when slowing down.

03

Suspension

Front

Stiffness 117.2kNm
Anti-roll bar 31kNm
Slow bump 7800
Fast bump 3900
Slow rebound 15500
Fast rebound 9700

Rear

Stiffness 74.8kNm
Anti-roll bar 12.8kNm
Slow bump 5000
Fast bump 2900
Slow rebound 10200
Fast rebound 6700
04

Steering, camber & toe

Caster 4.07°
Steering angle 48.75°
Ackermann 65.88%
Braking 77.4% AV
Front camber -3.9°
Rear camber -6.03°
Front toe 0.05°
Rear toe 0.055°
Calculation details & input data

Theoretical top speed

277.1 kph

Max speed (aero drag)

277.1 kph

Powerband

7697 → 8175 rpm

Gear 123456
Top speed per gear (km/h) 62109156200250277
Power
264 hp
Weight
883 kg
Class
C4 (299 HP/t)
Front balance
62 %
Rev limiter (rpm)
8780
Wheelbase (m)
2.622 m
Center of mass height (inches)
8.3 inches
Front
265/40 R16 · 1.08
Rear
265/40 R16 · 1.08
Front/rear frequencies
3.2 / 3.2 Hz
Target roll gradient
0.066°/g · TLLTD 70.8 %
Curves extracted from the screenshot

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