Drag Tuning Guide â€” AWD

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 at launch â†’ drop rear PSI 1â€“2 Â· Flat launch â†’ raise front PSI 1â€“2 for weight transfer

Gearing

Wheelspin off the line despite AWDRaise Final Drive slightly Â· AWD hooks up hard â€” if it's spinning, more FD compresses the power delivery
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 200 feet early
Bogging off the lineLower 1st gear ratio or shorten it Â· AWD should launch clean â€” if it bogs, the gear is too long for the power
AWD vs RWD Final DriveAWD typically needs a higher FD than RWD â€” more traction means more power can be exploited without wheelspin
Use 6 speeds for most AWD drag buildsTight ratios with a short 1st and proper FD is all that's needed Â· More speeds rarely helps on a straight
Top gear not reaching rev limiterRaise Final Drive or shorten top gear Â· Every run should end right at or near the limiter in top gear

Alignment

Camber

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

Wheelspin at launch â†’ move all 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	15 â€“ 22
Rear	20 â€“ 30
Note	Balanced for 4WD launch stability

Car tilting at launch â†’ balance ARBs front/rear Â· Traction loss on launch â†’ confirm ARBs are within range

Springs

Front	300 â€“ 450 lbs/in
Rear	400 â€“ 550 lbs/in
Ride Height	Lower rear, neutral front

Rear squatting under acceleration â†’ stiffen rear springs Â· Wheelspin on launch â†’ lower rear height

Rebound

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

Front	5.0 â€“ 7.0
Rear	8.0 â€“ 11.0

Car tilting at launch â†’ balance rebound front/rear Â· Rear squatting â†’ raise rear rebound

Bump

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

Front	3.0 â€“ 5.0
Rear	5.0 â€“ 7.0

Rear compressing too much â†’ raise rear bump Â· Car tilting at launch â†’ adjust front bump

Differential Types

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

RaceAWD 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 Â· AWD wheelspin â†’ try Drag diff for maximum launch lock

Aero

Front	Minimum
Rear	Minimum
Note	AWD hooks without rear aero help

Still wheelspin despite AWD â†’ add small rear wing only Â· Losing top speed â†’ confirm aero is at minimum

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

Front

Acceleration	15 â€“ 25%
Deceleration	0 â€“ 5%

Rear

Acceleration	85 â€“ 100%
Deceleration	0 â€“ 5%

Center

Balance

55 â€“ 65% rear

AWD wheelspin at launch â†’ raise rear accel Â· Front wheels locking â†’ lower front accel

Quick Adjustments

Wheelspin on launch (AWD)Raise front diff accel / shorten 1st gear slightly
Bogging off the lineLower 1st gear ratio / raise Final Drive

Hitting rev limiter earlyLower Final Drive / add more gear speeds
Not reaching top speedRaise Final Drive / lengthen top gear

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€” AWD