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Originally Posted by Gary in BR
I have both of these problems the car is either too jarring or porpoises.
But, I do not have the 2nd "helper" spring on my car. Would this help???
I am also running the Ksport standard springs. Would getting a "softer" spring for the rear help.
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gary -
the standard spring rates are roughly 300/500. that's biased too much toward the rear. if you are comfortable with the front rate, you can reduce the rear to 400 lb / inch (7.0 kg / mm) and be fairly close to the PSS9 rates (4.7/6.6 or 260/370). that would be a lot more comfortable. if it's skipping over bumps when it's damped enough to eliminate the porpoising effect, then helper springs are a good idea. not sure if KSport has a kit for this, but i bet they do. FYI, 7kg springs from KSport for the rear of your car are only $100. you can get a pair of eibachs or hyperco for not much more. i don't have mine yet, so i can't take measurements, but other aftermarket helper springs will work here, too.