Tuning reference /center-diff

Center Differential (AWD)

Front/rear power split for AWD cars. Higher = more rear bias = more RWD-like.

What it does

Only appears on AWD cars (DrivetrainType = 2). The number is the percentage of torque sent rearward. 50% is a true 50:50 split; 100% is fully RWD-like.

Standard track AWD lives around 65–80% (rear-biased). Drift builds push 90–100%. Rally builds sit closer to 50–60% so the front wheels can pull the car through ruts and loose surfaces. Drag setups can go either way depending on launch weight transfer.

Center diff is the *cheapest* way to change AWD character without changing chassis balance. Moving 10% forward fixes a lot of corner-exit understeer at the cost of some throttle response.

In-game controls

Center diff (% to rear)
Range: 50–100%; defaults often 70%
Raise →
more RWD-like — more rotation on throttle, risk of corner-exit oversteer
← Lower
more pull-out-of-corner traction, more on-throttle understeer

Watch these telemetry signals

  • Tire slip ratio (longitudinal)slipRatio
    Where: Corner panels, "slip R" — front/rear and L/R
    Compare front-axle vs rear-axle slip under power. Fronts slipping with rears gripping = too much front bias; rears slipping with fronts gripping = too rear-biased.
  • Tire slip angle (lateral)slipAngle
    Where: Corner panels, "slip A" — compare front vs rear
    On corner exit: if the front pushes wide while the rear stays planted = center diff too far rear, fronts have no power to help pull through

Symptom → fix

What you feel Likely cause Try this
AWD car understeers on corner exitToo rear-biased — fronts have no torque to pull car straightShift center diff 5–10% forward
Rear steps out under power on AWDToo rear-biased AND/OR accel diff too lockedShift center diff 5–10% forward; if it stays, drop accel diff %
Car feels heavy on turn-in, doesn't rotateCenter diff too forwardShift 5–10% rearward; recheck

Symptoms that point here

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