Reddog said:
I have a full Whiteline adjustable suspension setup with adjustable koni yellows, Roush 1 inch drop springs, and adjustable UCA/LCA/end links. I have the front and rear sway bars and koni's set at medium stiffness at the moment. Should I set a stiffer setting in the front and softer in the rear (4 position settings available)? Also, should the Koni's be set to full hard setting for track use? I am still using the P-Zeros at the moment. Thanks for any advise for getting the most out of my GT track pack.
A good target for the rebound setting on the Konis is 65-75% of the critical damping value, which is dependent upon your spring rates.
Up front, setting the rebound to maximum would get you 65% critical damping for a spring rate of 415 lb/in. I very much doubt the Roush springs you have are that stiff. As such, I would avoid going full stiff in the front.
Similarly, the rear at full rebound damping will hit 65% critical damping for the crazy spring rate of 1400 lb/in. But that's because the rebound increases dramatically in the last turn of the knob, compared with the rate increase you get below that.
Most lowering kits put the rear rates at around 200 lb/in or so. A good setting to use for that would be 3/4 turn from full soft, which would get you 75% critical damping for a 250 lb/in spring. Up front, for a 250 lb/in spring, a setting of 1 1/2 turns will get you 68% critical, while 1 3/4 turns will get you 78% critical. 1 5/8 turns should thus get you about the right amount of rebound damping. But, of course, that assumes a 250 lb/in spring up front, which may or may not be what you've got.
If you want to see the raw numbers I'm using, plus the formulas you can use to compute these things, you can see my message on the subject at s197forum.com here: http://www.s197forum.com/forum/showpost.php?p=2139662&postcount=76. I'll be happy to copy that message to this thread if that would be convenient for people.