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Originally Posted by sperry
With the dampers set closer to the soft side of things, the car oscillates on the springs. Small bumps result in the car bouncing a few times, and when those bounces match the ruts in the road at your speed, you quickly run away into rollercoaster land, updownupdownupdownupdownupdownupdown. 
Setting the dampers towards the firm side of things, and the car seems to pitch. The front is tossed up by the bump, then as it comes down the rear is tossed up. Match speed with the bumps and it's bucking bronco time! At least in this situation, if the road smooths out a bit, then the car will settle back down. So this is how it's set right now.
What *really* sucks is how the suspension effects steady-state cornering. The car's got great turn in, and very little roll, but I find any little bump in a long corner makes the car oscillate between over- and under-steer. Perhaps that's just the nature of the beast.... I don't really know, since this is my 1st set of coilovers. The fact that the car bounces in steady state cornering does make me think it is valve related, but a new set of dampers from JIC is $260/corner, and I don't see how they'd be different. Springs are like $260 for four, so finding some springs that would better match my driving ability/road conditions to the existing dampers would be more affordable. |
I assume you've already tried all the different combinations of damping proportion F/R and it hasn't helped?
Those spring rates sound low enough to get a decent ride out of them. You might try checking how the rates are proportioned front/rear relative to what the OEM rates were, because if they're a different proportion it will change the level ride speed of the car. OEM's tend to design for level ride speeds around what you typically see on the highway. If the rear rate has changed quite a bit relative to the front, it could cause excessive pitching at highway speeds. Just a thought...
It sounds like the low to mid-speed damping could be too stiff, especially in the rear, if it's throwing the car loose even over small bumps in corners. A properly tuned car shouldn't be doing that. Do you know what kind of valving the dampers have - linear, digressive, progressive-digressive, digressive-progressive?