Radius arm angle. Pls. check my math.
 

I am about to reinstall my standard 24mm torsion bars with new Neatrix bushing into my 78SC. The car was at 24.5" ride height in the back which I like to achieve again. However, I have also since installed new Bilstein Hds all around which raised the ride height about 1/2" on all 4 corners.

Here are the measurements during disassembly. Car angle (jacked up at rear): 5 degrees. Radius arm angle dropped fully down: 32 degrees.

According to a the ride height calculator I found on this board I should be looking at a 34-35 degree angle on the radius arm at reinstall. I assume I subtract the 5 degree jack slant, which leaves me at around 30 degrees.

Does that sound about right? Thanks in advance.

So you're shooting for 35 degrees on your spring plate and now you want to deduct 5 degrees that resulted when jacking up the rear...30 degrees sounds good to me.

Go for it!

Hmm.... lessee...

If I understand you correctly, your "goal" is a free hanging droop angle of 35 degrees?.... based on info from the calculator?

If so .....

(EDIT..removed paragraph...)

Your best bet is to get two more jack stands and get the front elevated so that the car ( rocker sill measurement) is "level". Don't forget also..to remove the lower/rear spring plate cover bolt to allow full freedom of "droop" meaurement...you don't want the arm to rest on the lower/rear bolt by mistake.

One more thing...whatever the "calculator" tells you to do, subtract 1 degree if you're using Bilstein hi pressure shocks. The factory manual always seems to adjust the free hanging angle by that amount when Bilsteins are used...because their pre-load will raise the car a bit.

Anyone else confirm all this ?? ........

Wil

Bilstein hi pressure = Sports?

= HD's?

= both?

Bilstein HDs, the green ones. Not the Sport version.

Ulrich

AFAIK...Either one will have the same internal gas pressure...the only difference that I know of between HD and Sport is the valving...how stiff they are. As to internal gas pressure...they're both the same. Both will cause the same "rise".

Wil