When AndyH from SSC built his car he told every body that he used 300lbs front and 250lbs rear and said that the car felt more planted, how ever these spring rates are sodding hard for road use. In the 90's Westfield used to use 175lbs front and 150lbs rear for their road cars and the ride was supple and compliant on rough roads and roll was controlled by winding the dampers up. A race spec locost which is lighter than a Roadster 560kg ish runs 400lbs springs on the front and they run on ice rink flat tarmac.
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