Quote:
Originally Posted by Vince@MSperfab
I'd get full weight and a few miles on them before you make the changes. But before switching to a shorter spring try a 150# or 175# 12" spring you should get a bit more compression out of it and still maintain a good ride.
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I agree.. also measure the eye-to-eye of the shock when the springs have been broken in, or at least with some added weight in the trunk to simulate the sub box, full tank, etx. I believe the shocks are supposed to be 13.5" i2i at normal ride height leaving about 2.5" for bump travel and 2.5" for rebound travel.
If the spring is broken in and the i2i measurement is ~13.5" with normal weight on the 200lb/in springs, I don't think shorter springs or lighter weight springs would be the answer.
Lighter weight spring would be taking the same coilover but asking it to sit deeper into it's travel at regular ride height, so i might have 2" of bump travel and 4" of rebound travel, and on top of that the reduced stiffness of the spring will allow the shock to come that much closer & that much easier to bottoming out over a same bump for a heavier rate spring.
To use a shorter spring, the spring rate would have to go up (to keep same ride quality and 13.5" i2i) or else say a 10" or even 8" spring (to exaggerate) might coil-bind under full compression on the same 5"-travel shock body.
Really the ideal way to lower the rear end even more would be to get an overall-shorter-bodied coilover that maintains the same 5" travel (VariShock is 16.10", Koni is 16.10", Ridetech is ~15.9".. hard to find any shorter), to get a shorter-travel coilover with stiffer spring (due to reduced bump travel, at a sacrifice of ride quality), or to either lower the axle-side coilover mount or raise the framerail/body-side coilover mount.