But if you put too stiff of springs on for the car, then you don't get the benefit of the engineering that went into the rear suspension. If the rates are too high all of suspension deflection starts to transfer to the sidewall of the tires and the rubber bushings.
Now YOUR spring rates may not be so high that you are seeing that. But a rule of thumb in racing, and it is counter-intuitive, is go as soft as you can get away with. It's not as critical on the front because the McPherson strut has it's own limitations. But if you go too stiff on the front and soft on the rear, the car isn't balanced and in this case you would get understeer. Take it for what it's worth.
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