[tirwin]

I am going to 28mm rear torsion bars from stock on my '83. I'd like to know what my target number should be. I want the car to be at or maybe a little below Euro ride height.

I used Will Ferch's method to calculate the target spring plate angle.

Assumptions:
Weight of car:2740 lbs for '83 SC (is this high?)
60/40 rear/front weight distribution
28mm torsion bars

Results (assumes US ride height):
Static ride height droop: 3.80"
Weight-induced droop: 3.72"
Total droop: 7.52"
New spring plate angle: 23-24°

My understanding is that the ride height changes by .9" for every 3.2° of preload.

How much lower is Euro from US?

Anybody care to share the number they used with a similar setup? Am I in the right ballpark?