CarX Builder
C4

Touge · RWD

SI5 C3 touge

SI5 (Nissan Silvia (S15))

by Rev · published on 11/11/2026 · 6 views

Use as a base

224

Power

896

Weight

280

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)
224
Rev limiter (rpm)
7750
Low torque (Nm)
295
Mid torque (Nm)
275
High torque (Nm)
240
Fuel
Sport
Peak power (HP)
254 @ 6250 rpm
Peak torque (Nm)
308 @ 4750 rpm
Powerband (dyno)
5500 – 7250 rpm

Chassis

Weight (kg)
896
Front weight balance (%)
52
Center of mass height (inches)
10.4
Wheelbase (m)
2.505
Front track (m)
1.46
Rear track (m)
1.46
Front wheel spacer (cm)
25
Rear wheel spacer (cm)
21

Tires

Front tires
265/40 R16
Rear tires
285/40 R16
Front tire grip (index)
1.08
Rear tire grip (index)
1.08

Aero

Drag coefficient (Cx)
0.28
Air Resistance (Sx)
2.04
Front downforce (kg)
41
Rear downforce (kg)
46

Gearbox

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

Spec sheet

Installed parts

Engine

RS20 · swap

  • Block BLC [P] Prototype
  • Camshaft CSH [P] Prototype
  • Cylinder head HCE [P] Prototype
  • ECU ECU [P] Rev limiter : 7769 rpm Turbo pressure : 0.56 bar Prototype
  • Exhaust EXS [P] Prototype
  • Exhaust manifold EXM [P] Prototype
  • Fuel system EFS [P] Prototype
  • Intake manifold INT [P] Peak RPM : 8103 rpm Prototype
  • Turbo Leave stock Stock

Gearbox

T50S

  • Gearbox GBT [P] Prototype
  • Clutch CLH [P] Prototype
  • Differential Clutch 65 Ultimate
  • Drivetrain Leave stock Stock

Body

Stage 4

  • Weight reduction Weight reduce [P] Prototype
  • Body strengthening Body strengthening ST5 Elite
  • Front aero Front aero [P] Prototype
  • Rear aero Rear aero [P] Prototype
  • Fuel tank Leave stock Stock

Suspension

  • Front springs F_SS [P] Prototype
  • Rear springs R_SS [P] Prototype
  • Front shocks F_S [P] Prototype
  • Rear shocks R_S [P] Prototype
  • Front anti-roll bar F_SB [P] Prototype
  • Rear anti-roll bar R_SB [P] Prototype
  • Front arms F_ARM [P] Prototype
  • Rear arms R_ARM [P] Prototype
  • Brakes BR [P] Prototype

Wheels

  • Front rims 265/30 R18 Elite
  • Rear rims 285/30 R18 Elite
  • Front tires Stretch Elite
  • Rear tires Stretch Elite
  • Front spacers W +0.1 Ultimate
  • Rear spacers W +0.1 Ultimate
  • Tyre compound Racing+ Racing
01

Transmission

Final drive 3.17
Gear 1 2.92
Gear 2 2.28
Gear 3 1.89
Gear 4 1.56
Gear 5 1.29
Gear 6 1.07

Gear ratios and final drive calculated by the Build Lab for this discipline.

02

Differential

Accel lock 0.75
Edited Calculated : 0.6
Decel lock 0.55
Preload 75Nm

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 95kNm
Edited Calculated : 80 kNm
Suspension travel 92mm
Anti-roll bar 58kNm
Edited Calculated : 55.8 kNm
Slow bump 6431
Fast bump 3191
Slow rebound 9124
Fast rebound 4100
Edited Calculated : 4613

Rear

Stiffness 95.1kNm
Suspension travel 100.8mm
Anti-roll bar 45kNm
Edited Calculated : 35.6 kNm
Slow bump 6780
Fast bump 3390
Slow rebound 9660
Fast rebound 4875
04

Steering, camber & toe

Caster 5.07°
Steering angle 50.72°
Ackermann 64.96%
Braking 60% AV
Edited Calculated : 69 % AV
Front camber under load estimated -5.27°

Car resting on its wheels, standing still (static load, no roll or load transfer). In game, set -7.5° in the garage.

Front camber (garage setting) -7.5°
Edited Calculated : -6.45 °
Rear camber under load estimated -1.16°

Car resting on its wheels, standing still (static load, no roll or load transfer). In game, set -4.12° in the garage.

Rear camber (garage setting) -4.12°
Front toe 0°
Rear toe 0°
05

Aerodynamics and weight reduction

Front downforce 41kg
Rear downforce 46kg
Drag coefficient (Cx) 0.28
Frontal area (Sx) 2.04m²
Mass towards the front 51.05%
Mass height 13.41%
Body mass 748kg
06

Brakes and tyres

Max brake torque 5850N·m
Front tyre pressure 3bar
Rear tyre pressure 3bar
07

Gearbox: extras

Reverse gear 3.58
Shift delay 0.04s
Transmission loss 0.02
Calculation details & input data

Theoretical top speed

279.9 kph

Max speed (aero drag)

279.9 kph

Powerband

5500 → 7250 rpm

Gear 123456
Top speed per gear (km/h) 105135162197238280
Power
224 hp
Weight
896 kg
Class
C4 (250 HP/t)
Front balance
52 %
Rev limiter (rpm)
7750
Wheelbase (m)
2.505 m
Center of mass height (inches)
10.4 inches
Front
265/40 R16 · 1.08
Rear
285/40 R16 · 1.08
Front/rear frequencies
3.1003934473327 / 3.2005798326368 Hz
Target roll gradient
0.049°/g · TLLTD 56.3 %
Engine curves

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