Drag Tuning Guide

Tires

Drag

Required — always use for drag

Front PSI: 36 – 42

High = reduces contact, lets front roll freely

Rear PSI: 18 – 22

Low = maximum contact patch & compliance on launch

Front much higher than rear

Promotes weight transfer rearward on launch

Wheelspin at launch → drop rear PSI 1–2 · Flat launch → raise front PSI 1–2 for weight transfer

Gearing

Under 400 hp	5.20 – 5.60
400 – 700 hp	4.50 – 5.20
700 – 1000 hp	3.90 – 4.50
1000+ hp	3.40 – 3.90

Wheelspin before finish → raise FD slightly · Hitting limiter before line → lower FD

6-Speed — AWD

All-Wheel Drive

Adjust FD to hp range above

Multiplier0.77

Final Drive	4.50
1st	2.60
2nd	2.00
3rd	1.54
4th	1.19
5th	0.91
6th	0.70

Gearing Notes

1st gear	Short — aggressive launch
Top gear	Should hit limiter at end of track
Ratio spread	Tighter than RWD — AWD hooks earlier
FD rule	Raise if spinning, lower if bogging
vs RWD	AWD typically needs higher FD (more traction to exploit)

Alignment

Camber

Front	0° to -0.5°
Rear	0° to -0.5°

Wheelspin at launch → move all camber closer to 0° for maximum contact patch

Toe

Negative = in · Positive = out

Front	0°
Rear	0° to -0.1°

Car drifting under hard acceleration → add small rear toe-in (-0.1°)

Caster

Angle

5.0° to 6.5°

Car drifting under acceleration → lower caster slightly for lighter steering

Antiroll Bars

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

Front	15 – 22
Rear	20 – 30
Note	Balanced for 4WD launch stability

Car tilting at launch → balance ARBs front/rear · Traction loss on launch → confirm ARBs are within range

Springs

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

Rear squatting under acceleration → stiffen rear springs · Wheelspin on launch → lower rear height

Rebound

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

Front	5.0 – 7.0
Rear	8.0 – 11.0

Car tilting at launch → balance rebound front/rear · Rear squatting → raise rear rebound

Bump

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

Front	3.0 – 5.0
Rear	5.0 – 7.0

Rear compressing too much → raise rear bump · Car tilting at launch → adjust front bump

Differential Types

StockLow class / saves PI — limited or no tuning available

RaceAWD drag — full accel/decel tuning range

DragDedicated drag diff — maximum lock optimised for launch

DriftRoad drift — high lock bias, sustained slides

OffroadOffroad builds — loose surface compliance

RallyMixed events — road & dirt compromise

Limited accel range → confirm Race or Drag diff · AWD wheelspin → try Drag diff for maximum launch lock

Aero

Front	Minimum
Rear	Minimum
Note	AWD hooks without rear aero help

Still wheelspin despite AWD → add small rear wing only · Losing top speed → confirm aero is at minimum

Brake

Balance	50 – 55% front
Pressure	100%

Inconsistent braking after run → confirm 100% pressure · No balance adjustment needed on a straight

Differential

Front

Acceleration	15 – 25%
Deceleration	0 – 5%

Rear

Acceleration	85 – 100%
Deceleration	0 – 5%

Center

Balance

55 – 65% rear

AWD wheelspin at launch → raise rear accel · Front wheels locking → 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 — AWD