The three numbers
- Accel — how locked together the drive wheels are when you're on the throttle. High = both spin together (good for launch and forward drive). Low = they can spin independently (good for tight turn rotation).
- Decel — how locked together they are when you lift. High = engine braking on both wheels (can lock the rear and spin you). Low = they decouple (smoother lift, less spin risk).
- Preload (some games) — base lock applied always. Sets the floor; FH usually buries this.
Quick guidelines
| Use case | Accel | Decel |
|---|---|---|
| Drag, launch, straight-line | 95-100% | 0-15% |
| RWD grip / time attack | 50-65% | 15-25% |
| RWD drift | 95-100% | 60-90% |
| AWD grip | 45-60% | 15-25% |
| FWD all-round | 40-55% | 5-15% |
The "snap" diagnostic
If you're spinning on lift-off mid-corner: decel diff is too high. Drop it 15-20% and retest. If you're lazy off the corner with inside-wheel spin: accel diff is too low. Raise it 10-15%. If you're pushing wide on power: accel diff might be too HIGH for the car (especially FWD/AWD). Drop it 10%.