Include

[pmontelo]

Originally posted by RocketSled

Can anyone explain why this would be true?

Yeah, my car definately got a little bouncier. It seems to rebound a bit too much on rough roads.

When you lower the car, the I belive the suspension will operate in a narrower range of upward travel most of the time. The shocks will also be forced operate in narrower range most of the time.

The shocks will also be "pre-compressed" more which I believe increases the spring rate, even if the springs are not pre-compressed more (which they are not as far as I understand). I think the ride quality degradation is mostly due to the shocks not operating in the range they were designed to.

Also if you lower the car a lot (i.e. cut the bushings/longer bolts), you should also hit the "jounce" bumpers more easily (bottom out the suspension). The video talks about this. When that happens, the spring rates increase sharply and that can cause snap (over bumps) oversteer condition in the rear and snap understeer in the front .

From what I understand, if you really want to slam the car, the best thing to do is to replace the shocks with a set that are designed to operate in the new range of travel. Most of the autocross guys are going with the Penskes (pricey).