FH6 Rally Tuning Guide

On dirt and gravel, compliance is grip. A tarmac setup skips and skitters across a loose surface because its stiff springs treat every rut as a launch ramp. Rally tuning in Forza Horizon 6 is the art of letting the suspension do the work so the tires can stay in contact with a surface that never stops moving.

Springs: half of what tarmac wants

The single biggest change: rally rates are the race rates cut in half. Soft springs let each wheel follow the surface down into dips and over crests instead of carrying the whole car airborne. The familiar rules still apply on top — the heavier end gets the stiffer spring, shifted 15 lb/in per 1% of weight distribution.

Ride height: 75% with a floor

Rally runs at about 75% of your car's ride-height range, with a floor around 5.8 inches — soft springs need travel to work, and rough stages eat travel fast. Bottoming out mid-compression is worse than the slightly higher center of gravity.

Anti-roll bars: nearly disconnect them

Both ARBs go to 6 — near the minimum. An anti-roll bar couples the two wheels on an axle, which is exactly what you don't want when the left wheel is in a rut and the right is on a crown. On loose surfaces, tune balance with the differential and dampers instead; the bars stay out of the way.

Damping: soft bump, firm rebound

Rally damping breaks the usual ratio rule: bump drops to the slider floor (~1.0) so the wheel can react instantly to impacts, while rebound stays firm and front-biased — about 6.0 front / 5.5 rear — to control how fast the stored spring energy returns. Soft bump absorbs the hit; firm rebound stops the pogo.

Tires, brakes, alignment

• Rally compound at ~29.5 PSI — lower than tarmac so the carcass can deform around loose stones and find bite.
• Brake bias 48% front — slightly rearward. On gravel the fronts lock unpredictably; rear-shifted bias keeps the car rotatable and recoverable on the brakes.
• Gentle camber (~−1.0° front) — the surface moves too much for aggressive static camber to pay off, and toe stays at zero.

Differential and gearing

RWD rally runs 60% accel / 20% decel — more locked than circuit because wheelspin is constant and you steer with the throttle; the extra decel lock stabilizes lift-off rotation on entry. AWD splits 35/7 front, 62/22 rear, center 70% rearward. Gearing goes short: +0.50 on the final drive with ratio anchors of 3.50 to 0.90, trading top speed you can't use on a stage for punch out of hairpins.

Enter your car's numbers and the calculator builds the whole stage setup: