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Originally Posted by T-RexRacer
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.
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I thought the engineering that went into the rear suspension was not the best, but that's just my opinion.
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If the rates are too high all of suspension deflection starts to transfer to the sidewall of the tires and the rubber bushings.
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Agreed, that there is going to be more deflection in the bushings and tire, but I don't think it's as bad as people point out. As long as the damper is valved for the spring rates then it's a matter of tuning the rates F/R to get the best handling characturistics.
Some of the fastest IT guys with B13 chassis's(Greg Amy is a perfect example) are well above 1000lb spring rates with custom valved Koni's that can work with these stiffer springs. Just 5 years ago this was thought to be the wrong way to go for many of the reasons that you just mentioned and that 550-600lbs springs were the limit, even with a full cage. Just food for thought...