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Both roll bars too soft and there is excessive roll.
Both roll bars to stiff and the car will tend to slide and dart.
Too soft front spring, the nose drops, understeer, will not turn in.
Too stiff front spring, and the front will brake loose over the bumps.
Too soft rear spring and there will be excessive squat.
Too stiff rear spring, the car will oversteer on acceleration.
All springs too stiff and the car looses contact with the track surface in bumpy corners.
Too stiff shocks, the car will unload abruptly.
Too soft shocks, the car floats, rolls and oscillates
Hope this helps