Drag Tuning Guide â€” RWD

Tires

Drag

Required â€” always use for drag

Front PSI: 36 â€“ 42

High = reduces contact, lets front roll freely

Rear PSI: 18 â€“ 22

Low = maximum contact patch & compliance on launch

Front much higher than rear

Promotes weight transfer rearward on launch

Wheelspin off the line â†’ drop rear PSI 1â€“2 Â· Slow to 60 â†’ raise front PSI 1â€“2 for weight transfer

Gearing

Wheelspin on launchLengthen 1st gear â€” RWD needs a longer 1st than AWD to manage rear traction off the line Â· Don't just raise FD
Hitting rev limiter well before the finish lineLower Final Drive Â· Top gear should carry you to the end of the strip, not run out early
Bogging off the lineShorten 1st gear ratio or raise Final Drive slightly Â· Find the balance between traction control and launch aggression
RWD vs AWD Final DriveRWD typically needs a lower FD than AWD â€” less traction means you need more torque control, especially in 1st and 2nd
Power shifting between gearsGear ratios should step down gradually Â· Big gaps between ratios cause a hard power interruption mid-run
Use 6 speeds for most RWD drag buildsTight ratio spread with a slightly longer 1st is the sweet spot Â· More gears rarely improves a straight-line time

Alignment

Camber

Front	0Â° to -0.5Â°
Rear	0Â° to -0.5Â°

Wheelspin at launch â†’ move rear camber closer to 0Â° for maximum contact patch

Toe

Negative = in Â· Positive = out

Front	0Â°
Rear	0Â° to -0.1Â°

Car drifting under hard acceleration â†’ add small rear toe-in (-0.1Â°)

Caster

Angle

5.0Â° to 6.5Â°

Car drifting under acceleration â†’ lower caster slightly for lighter steering

Antiroll Bars

Softer front = nose lifts for weight transfer Â· Stiffer rear = plants on launch

Front	8 â€“ 15
Rear	30 â€“ 45
Note	Soft front = nose rises = weight shifts rearward

Wheelspin at launch â†’ stiffen rear ARB further Â· Nose won't lift â†’ soften front ARB

Springs

Front	200 â€“ 350 lbs/in
Rear	500 â€“ 700 lbs/in
Ride Height	Raise front slightly, lower rear

Wheelspin at launch â†’ stiffen rear springs or lower rear height Â· Nose won't lift â†’ soften front springs

Rebound

Controls extension speed · Stiffer front = resists dive · Stiffer rear = resists squat

Front	4.0 â€“ 6.0
Rear	9.0 â€“ 12.0

Nose won't lift at launch â†’ lower front rebound Â· Rear squatting too much â†’ raise rear rebound

Bump

Controls compression speed · Set bump first · Rebound = bump × 2

Front	2.0 â€“ 4.0
Rear	6.0 â€“ 8.0

Rear won't plant â†’ raise rear bump Â· Nose rising too violently â†’ raise front bump

Differential Types

StockLow class / saves PI â€” limited or no tuning available

RaceRWD drag â€” full accel/decel tuning range

DragDedicated drag diff â€” maximum lock optimised for launch

DriftRoad drift â€” high lock bias, sustained slides

OffroadOffroad builds â€” loose surface compliance

RallyMixed events â€” road & dirt compromise

Limited accel range â†’ confirm Race or Drag diff is equipped Â· Max wheelspin â†’ use Drag diff for dedicated lock

Aero

Front	Minimum
Rear	Small amount for traction
Note	RWD benefits from small rear wing more than AWD

Wheelspin at launch â†’ add small rear wing Â· Losing top speed at end of strip â†’ reduce rear wing

Brake

Balance	50 â€“ 55% front
Pressure	100%

Inconsistent braking after run â†’ confirm 100% pressure Â· No balance adjustment needed on a straight

Differential

Acceleration	85 â€“ 100%
Deceleration	0 â€“ 5%
Start point	Accel 95% / Decel 0%

Rear wheels not locking together on launch â†’ raise accel to max Â· Braking instability after run â†’ raise decel slightly

Quick Adjustments

Wheelspin on launch (RWD)Raise 1st gear / lower rear PSI / add small rear aero
Bogging off the lineLower 1st gear ratio / raise Final Drive

Hitting rev limiter earlyLower Final Drive / add more gear speeds
Front lifting too muchStiffen front ARB slightly / raise front PSI

Poor straight-line stabilityAdd slight rear toe in / stiffen rear ARB
Launch ControlUpgrade to Race Twin Turbo with Anti-Lag under Force Induction

Made by Caspeyy

Last updated: May 25, 2026

Drag Tuning â€” RWD