Note: RR cars — like the Porsche 911, VW Beetle, or Renault R5 Turbo — have a very rearward weight bias, meaning the front tires are heavily underloaded. This layout is inherently prone to understeer, especially on corner entry or mid-corner, unless carefully tuned or driven with finesse.

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Cause

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• very light front axle - front tires don’t have much weight. As a result, it is hard to initiate rotation

• aggressive throttle use - load shifts rearward. Therefore, front tires unload further

• braking shifts weight rearward slowly - not enough load on front even under trail braking

• stiff front suspension or ARB - prevents tires from compressing and gaining grip on turn-in

• torque application from the rear - pushes car straight ahead rather than rotating

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Fixes

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Entry Phase (usually caused by overloading of front tires)

• increase front brake balance (prevents front tires from overloading and sliding)

• soften front springs (increases front grip)

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

• increase front negative camber (improves grip on cornering)

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Mid-Corner (too much front stiffness or too soft or grippy rear, to much rear aero)​

• reduce rear aero / increase front aero (to aid rotation)

• soften front springs (increases front end grip during lateral load)

• stiffen rear springs

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

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

• softer front ARB

• increase negative front camber (for better lateral grip) - adjustments should be slight 

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Exit Phase (poor car rotation - too much rear grip, too much front rebound stiffness, front tires being unloaded by early throttle)

• reduce rear aero (to aid rotation)

• stiffen rear springs (prevents the rear from squatting excessively during throttle application and ensures rotation before throttle application)

• soften front rebound damping (allows the front to settle quicker as you exit corner and therefore regain grip)

• increase front negative camber

• more front negative camber (maintains better tire contact under lateral load, especially if the front is lightening during throttle. This supports cornering grip during acceleration, helping keep the front end from pushing wide)