UMI Releases New Product: Bolt In Rear Coilover for the 1964-1972 GM A-Body

[andrewb70]

Originally Posted by UMI Tech

When designing a coil for the A-body for instance, we know some of the general parameters and don't deviate much from tried and true situations. For example, 130 lb/in works pretty nice. I can work in the 100 lb range safely and the 150 lb range safely. Beyond those numbers takes different tuning and balancing. Same goes for stroke lengths on the shocks. We follow the 60/40 rule where we like to have the shock shaft between 40 and 60% of its travel at ride height. Too much one way and we top or bottom the shock out. We also want to stay in normal situations like aprrox 5" stroke. 4 is a little low. 3 is really low. Extension is a little more forgiving where we can use 6-7 ish.

All of our stuff comes from driving, trying, re driving, re trying, racing, driving, testing then releasing product. Usually its' good, sometimes even the best plans need tweaked...

ramey

Thanks!

Andrew