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Dirt Circuit Tuning Guide

Dirt & Gravel Tracks — AWD & RWD — Rally-style tune — more predictable than cross country

Tires
Rally (primary)
Best balance on maintained dirt tracks
Offroad Racing (alternative)
More grip on loose/rough sections
Snow (winter circuits)
Required on snow & ice surfaces
PSI: F 23–26
R 22–25
Lower than road — allows surface compliance
Losing grip on loose surface → drop PSI 1–2 · Surface too rough → switch compound to Offroad Racing
Tire Width
PowerRWD FrontRWD RearAWD FrontAWD Rear
Under 300 hp215–235245–265225–245235–255
300–500 hp225–245255–280235–255245–270
500–700 hp235–255270–295245–265260–285
700–1000 hp245–265285–315255–275275–300
1000+ hp260–280305–345265–285290–315
Losing traction on loose exits → widen rear 5mm · Set compound type first, width second
Gearing — raise ~0.30–0.50 above circuit equivalent
Under 160 mph4.50 – 4.90 160 – 180 mph4.10 – 4.50
180 – 210 mph3.70 – 4.10 210+ mph3.30 – 3.70
Bogging through dirt corners → raise FD 0.10–0.20 · Overrevving on straights → lower FD slightly
6-Speed — Under 180 mph
Primary Choice
~200–600 hp
Multiplier0.76
Final Drive4.40
1st3.10
2nd2.36
3rd1.79
4th1.37
5th1.04
6th0.79
7-Speed — 180–210 mph
High Speed Tracks
~600–1000 hp
Multiplier0.78
Final Drive4.00
1st3.20
2nd2.50
3rd1.95
4th1.52
5th1.19
6th0.93
7th0.72
Alignment
Camber
Front-1.5° to -2.5°
Rear-1.0° to -1.5°
Understeer on dirt corners → slightly more negative front camber · Rear stepping out → reduce rear camber
Toe
Negative = in · Positive = out
Front0° to +0.2°
Rear-0.2° to -0.4°
Poor turn-in on dirt → add front toe-out · Rear stepping out under power → add rear toe-in
Caster
Angle5.5° to 7.0°
Slow steering return on loose surface → raise caster · Car wandering at speed → raise caster
Antiroll Bars
Stiffer front = less oversteer · Stiffer rear = less understeer · The gap matters more than the values
Front22 – 32
Rear18 – 28
NoteSofter than road circuit
Understeer on dirt corners → stiffen front ARB · Rear stepping out → soften rear ARB
Springs
lbs/in — Ride Height: raise 2–4 clicks
Rear = Front + 20–30 lbs/in · Pick front by weight, add ~25 for rear
Light (<2,600 lbs)F 175–350
R 200–375
Sport (2,600–3,400)F 275–475
R 300–500
Muscle (3,400–4,200)F 400–600
R 425–625
Heavy (4,200+ lbs)F 550–775
R 575–800
Traction loss on rough patches → soften springs · Bottoming on crests → raise ride height first
Rebound
Controls extension speed · Stiffer front = resists dive · Stiffer rear = resists squat
Front6.0 – 8.0
Rear5.0 – 7.0
Car wallowing → raise rebound · Bouncing on rough entry → raise front rebound
Bump
Controls compression speed · Set bump first · Rebound = bump × 2
Front3.5 – 5.5
Rear3.0 – 5.0
Front bouncing on rough entry → lower front bump · Rear bouncing on loose surface → lower rear bump
Differential Types
StockLow class / saves PI — limited or no tuning available
RaceRoad circuit — full accel/decel tuning range
RallyDirt circuit — road & dirt optimised, full tuning range
OffroadDirt circuit (alt) — loose surface compliance
DriftRoad drift — high lock bias, sustained slides
DragStraight line only — maximum lock, launch focused
Too much wheelspin on loose sections → try Offroad diff · Set diff type before tuning accel/decel
Aero
FrontMinimum
RearMinimum to small amount
NoteLess useful on dirt surfaces
Sliding wide on fast sections → add small amount of rear aero · Losing top speed → confirm aero is at minimum
Brake
AWD Balance52 – 58% front
RWD Balance55 – 62% front
Pressure90 – 100%
Rear locking on dirt entry → raise front balance % · Too much rotation under braking → raise front balance %
Differential
AWD — Front
Acceleration20 – 30%
Deceleration10 – 20%
AWD — Rear / RWD
Acceleration45 – 60%
Deceleration20 – 35%
AWD — Center
Balance50 – 55% rear
Wheelspin on loose exits → raise accel · Rear unstable on dirt braking zones → raise decel
Quick Adjustments
  • Oversteer on loose cornersRaise diff decel / add rear toe in (+0.1°)
  • Understeer (AWD)Lower front diff accel / soften front ARB
  • Bouncy over rough patchesLower bump damping on both axles
  • Sliding wide on exitLower diff accel slightly / stiffen rear ARB
  • Losing traction on loose surfaceLower tire PSI slightly / switch to Offroad Racing tires
  • Unstable at high speedStiffen rear ARB / add small amount of rear aero
Made by Caspeyy
Last updated: May 25, 2026