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In the videos it looks like the rear of the car is bouncing up and down some, I removed the 170# springs from the coilovers earlier this year and tried 130# springs friday for the 1st time. I'll take the 170's with me next time out to track test. 
Hopefully I'm not leading you down the wrong path Bob, BUT, You should only ever have enuff spring at the rear, to hold the rear of the car up. If the rear is bouncing around on a pass, the shocks dampening need to be adjusted to control that, not stiffer springs. And, the shock should be in the middle of it's travel at ride height.
Do you have adjustable shocks??
Last edited by STEFF; 07/09/09 10:19 PM.
