Note: RR cars, like the Porsche 911, have a rearward weight distribution, which makes them more sensitive to rear-end behavior, particularly under acceleration, braking, and during high-speed cornering. Oversteer in RR cars can be sudden and aggressive, particularly if the rear tires lose grip.

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Causes

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• Rear Weight Bias: rear tires are heavily loaded and have a lot grip but can breakaway suddenly on weight shifts during cornering or acceleration

• Aggressive Throttle: rear tires are overpowered on corner exit, causing rear spin or excessive rotation

• Lift-Off Oversteer: abrupt throttle lift while cornering transfers weight forward, unloading the rear tires

• Brake Bias Too Rearward: too much rear braking can cause the rear tires to lock up or lose traction, inducing a spin

• Stiff Rear Suspension: causes the rear to be too responsive to weight shifts, losing rear grip during transition

• Tire Imbalance: uneven tire wear or pressures can make the rear more likely to lose traction than the front.

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Fixes

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Entry Phase (trail braking / lift off - rear gets light suddenly - can be caused by: 1) too much brake force on the rear; 2) sudden forward weight shift with throttle lift off; and 3) aggressive trail braking)

• large front brake bias increase (to stabilize rear under braking - helps prevent rear unloading and reduces sudden shifts in weight that trigger oversteer)

• increase rear aero

• soften rear rebound damping

• soften rear compression damping (to slow the rear's rise and maintain grip / slow rotation)

• soften rear ARB (to increase compliance on corner entry)

• slightly stiffen front ARB (for added stability on entry)

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Mid-Corner (lateral load overwhelms rear grip - can be caused by: 1) rear suspension too stiff and can't maintain grip; 2) too much camber and poor tire contact; 3) aero imbalance

• increase rear aero (to plant rear)

• much softer rear springs (to improve compliance)

• soften rear compression damping (to allow better tire contact)

• slightly stiffer front ARB (to reduce mid corner rotation)

• decrease negative rear camber (balances grip preventing them from losing grip too soon)

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Exit Phase (throttle overwhelms rear tires. Throttle management is critical)

• increase rear aero (to keep rear planted)

• stiffen front springs (keeps the cars front end more stable under acceleration alllowing controlled rotation from the rear)

• softer rear rebound damping (to prevent snap)

• stiffen front ARB

• moderate negative rear camber (for cornering grip)