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Cross Country Tuning Guide

Open Terrain — Jumps & Rough Ground — Maximum compliance — AWD strongly recommended

Tires
Offroad Racing (primary)
Maximum grip on rough & loose terrain
Rally (mixed routes)
If route includes significant road sections
Snow (winter)
Required for snow & ice terrain
PSI: F 18–22
R 17–21
Very low — maximum surface compliance over terrain
Losing grip over rough terrain → drop PSI further · Compound wrong for surface → switch 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
Digging into soft ground → narrow rear 10mm · Losing traction → drop PSI further before widening
Gearing
Alignment
Camber
Front0° to -1.5°
Rear0° to -1.0°
Instability on jumps → move camber closer to 0° · Understeer in corners → add -0.5° front camber
Toe
Negative = in · Positive = out
Front0° to +0.1°
Rear0° to -0.2°
Instability over rough terrain → add small rear toe-in (-0.1°) · Understeer → reduce rear toe-in
Caster
Angle5.0° to 6.5°
Car wandering at speed on open terrain → raise caster slightly
Antiroll Bars
Stiffer front = less oversteer · Stiffer rear = less understeer · The gap matters more than the values
Front10 – 18
Rear8 – 14
NoteVery soft — allows full suspension travel
Wheel lifting on rough ground → soften ARBs further · Excessive body roll → stiffen front ARB slightly only
Springs
Use minimum available · Ride Height: maximum available
Light (<2,600 lbs)min ~100–200
Sport (2,600–3,400)min ~150–300
Muscle (3,400–4,200)min ~275–425
Heavy (4,200+ lbs)min ~350–550
Bottoming out on jumps → raise ride height first · Traction loss on terrain → confirm springs are at minimum
Rebound
Controls extension speed · Stiffer front = resists dive · Stiffer rear = resists squat
Front5.0 – 7.0
Rear4.5 – 6.5
Bouncing uncontrollably after landings → raise rebound · Slow to recover between hits → lower rebound
Bump
Controls compression speed · Set bump first · Rebound = bump × 2
Front2.0 – 4.0
Rear2.0 – 3.5
Front deflecting off terrain → lower front bump · Rear losing contact → lower rear bump
Differential Types
StockLow class / saves PI — limited or no tuning available
RaceRoad circuit — full accel/decel tuning range
OffroadCross country — loose surface compliance, full tuning range
RallyCross country (alt) — road & dirt compromise
DriftRoad drift — high lock bias, sustained slides
DragStraight line only — maximum lock, launch focused
Mixed road/dirt route → switch to Rally diff · Losing traction on rough terrain → confirm Offroad diff
Aero
FrontMinimum
RearMinimum
NoteDownforce irrelevant on rough terrain
No adjustment needed — keep aero at minimum for all cross-country builds
Brake
AWD Balance52 – 57% front
RWD Balance55 – 60% front
Pressure90 – 100%
Rear locking on loose terrain → raise front balance % · Front locking first → lower front balance %
Differential
AWD — Front
Acceleration25 – 40%
Deceleration15 – 25%
AWD — Rear / RWD
Acceleration35 – 55%
Deceleration15 – 30%
AWD — Center
Balance48 – 55% rear
Losing traction on steep climbs → raise both front and rear accel · AWD understeer → lower front accel slightly
Quick Adjustments
  • Bottoming out on jumps / landingsStiffen bump damping slightly / raise ride height further
  • Bouncing uncontrollablyRaise rebound damping slightly on the bouncing axle
  • Spinning out on loose cornersRaise diff decel / add slight rear toe in
  • Understeer (AWD)Lower front diff accel / raise rear center bias slightly
  • Losing traction on steep climbsRaise both front & rear diff accel / lower tire PSI
  • Unstable at speed on flat sectionsStiffen ARBs slightly / add rear toe in (+0.1°)
Made by Caspeyy
Last updated: May 25, 2026