On my old WackyWabbit SCCA H-production road race car, I used a front spring rate of 500# to 600# depending on the type of track and a rear spring rate of 350# with two rear anti-sway bars. I had a selection of rear anti-sway bars and used different ones for different tracks.
The springs were the race type 2-1/2 inch ID with a length of 7 inches.
Spring rates were selected based on a prelimanary calculation of the Roll Couple Distribution. Anti-sway bars also provide an equivalent "spring rate" to the calculation.
suggested by ground control and others
swapped the front springs to the back and go some 450's
wanted stiffer for track days and autox events, but not soo stiff it couldn't be semi-comfortably street driven. Also wanted to get a little more adjustment out of my ground controls, so i use shorter springs in the front, and was then able to corner balance the car
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