wrightbenz

What lenght spring for escort cup rear coilovers? I have 8 inch springs but in order to acheive the correct ride height I can't compress them at all. I have already reindexed the tbars so the car is really riding on the coil overs for the most part. So anyway is anyone using shorter springs?

Oddjob

Depending on the orientation/index of the t-bars, and on the springs rates, you may need anywhere from 6", 7", or 8" rear springs in order to achieve the ride height you want but not have the lower perch hit the trailing arm (if the spring is too long).

I have used both 7" & 8" rear springs with the t-bar indexed at ride height, in the range of 325 - 500 lb/in springs. For example, the 325 and 400s are 8" and work fine. 8" 450s are a little too long. 7" 425s are just a little too short and require a 1/4" spacer on the spring perch to get the ride height I want w/o running the perch off the top of the threads. 500s need to be 7" to keep from hitting the trailing arm.

Make sense (almost)?

wrightbenz

I purchased this car with these on there and the rear was to high. So what I have done is reindex the tbars up one spline on the spring plate end. But If I still have a problem with the spring collars hitting the trailing arm because the springs are to long. I believe they are 400 or 475 lb springs 8 inches long. I can check the paper work to be sure. What so you think?

Oddjob

If you want to keep the same spring rate, and your 8" springs are too long, go with 7" springs (unless the car is sitting an 1" or more too high, then go with 6" springs).

If you are changing spring rates, then it gets a little more complicated to anticipate what length will work best.

fork_included

if you know the specific spring rate you have on the car now

measure how much the spring compresses to its current height.

so for instance if your 400# 8" spring comprsses 1" then its supporting 400lb of static weight

if you want the car to go down another 1", you can either throw some junk in the trunk, decrease the spring rate to 200# and keep the 8" length

or if you want to keep the 400# reduce the length to 7"

in the former scenario the dynamics of the car will change however, in the latter spring binding may become an issue... but dont hold me to that

now if torsion bars are involved, its just more math assuming we know what the measured spring rate of the torsion bars are.

wrightbenz

Need to know the tread pitch on the rear shock bolt 14mm x 1.5 or 2.0 ???

Oddjob

M14x1.5x85