CarX Builder
C3

Touge · RWD

SI5 C3 touge

SI5 (Nissan Silvia (S15))

by Rev · published on 12/11/2026 · 1 views

Use as a base

254

Power

1019

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)
254
Rev limiter (rpm)
7769
Low torque (Nm)
274
Mid torque (Nm)
303
High torque (Nm)
275
Fuel
Sport
Peak power (HP)
254 @ 6250 rpm
Peak torque (Nm)
308 @ 4750 rpm
Powerband (dyno)
5500 – 7250 rpm

Chassis

Weight (kg)
1019
Front weight balance (%)
51
Center of mass height (inches)
10.4
Wheelbase (m)
2.505
Front track (m)
1.46
Rear track (m)
1.46

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)
0.28
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 BLC4 Low torque : 274 N·m Ultimate
  • Camshaft CSH3_high High torque : 275 N·m Racing
  • Cylinder head HCE3_high Mid torque : 303 N·m Elite
  • ECU ECU [P] Rev limiter : 7769 rpm Turbo pressure : 0.56 bar Prototype
  • Exhaust EXS [P] Prototype
  • Exhaust manifold EXM [P] Prototype
  • Fuel system EFS4 Elite
  • 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 265/40 R16 Sport
  • Rear rims 265/40 R16 Sport
  • Front tires Racing Racing
  • Rear tires Racing Racing
  • 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 90kNm
Edited Calculated : 80 kNm
Suspension travel 92mm
Anti-roll bar 75kNm
Edited Calculated : 55.8 kNm
Slow bump 6431
Fast bump 3191
Slow rebound 9124
Fast rebound 4613

Rear

Stiffness 75kNm
Edited Calculated : 95.1 kNm
Suspension travel 100.8mm
Anti-roll bar 31kNm
Edited Calculated : 35.6 kNm
Slow bump 6780
Fast bump 3390
Slow rebound 9660
Fast rebound 4875
04

Steering, camber & toe

Caster 5.06°
Steering angle 55.72°
Ackermann 64.96%
Braking 60% AV
Edited Calculated : 69 % AV
Front camber under load estimated -4.22°

Car resting on its wheels, standing still (static load, no roll or load transfer). In game, set -6.45° in the garage.

Front camber (garage setting) -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 0.3°
Edited Calculated : 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) 103132159192233280
Power
254 hp
Weight
1019 kg
Class
C3 (249.3 HP/t)
Front balance
51 %
Rev limiter (rpm)
7769
Wheelbase (m)
2.505 m
Center of mass height (inches)
10.4 inches
Front
265/40 R16 · 1.08
Rear
265/40 R16 · 1.08
Front/rear frequencies
2.8673334293721 / 2.65398346819 Hz
Target roll gradient
0.073°/g · TLLTD 70.8 %
Engine curves

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