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Re: To whomever it may concern. Just did (archive)

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Posted by Kirk McGraw on March 02, 2002 at 15:15:40:

In Reply to: Re: To whomever it may concern. Just did posted by Ron Sarne on February 26, 2002 at 16:58:08:

I'm in the middle of a suspension rebuild on my 91. After removing the springs and swaybars, I cycled the suspension in 1/2" increments and measured camber and toe. I will repeat the procedure after getting the new bushings in and post the results.

I've left my notes at the shop, but thought I should give you a little pre-release info.

1) Rear toe is remarkably constant, must be those dog-bones at work (pitman arms).

2) Front camber gradually increases as the suspension compresses, and there is substantial bump steer (change in toe).

3) Rear camber changes radically once compressed about an inch beyond stock M5 ride height. I make the conclusion that a good suspension should not lower the rear at all and should have high roll stiffness (duh!)

For street driven E34's that will carry passengers I believe it is best to leave the load leveling in place. Otherwise, your suspension will be operating in this nasty high camber change region when you have passengers. Dinan's web site has a note to this effect, even though their sales drones are ignorant of the fact. Some people are under the impression that self-leveling will cause the rear to lift (jack up) when cornering. Actually, the lever is connected to the center of the bar, so that this does not occur. Nice engineering, simple and effective.

A couple of other notes. 1) Bilsteins do jack the front, I had one hydraulic and one Bilstein in the front. Now I know why that side was 1/4" higher! 2) With old Dinan springs, I was riding on the factory bump stops. You can't tell once the boots are in place.

In case your're wondering, I'm replacing most of the rear rubber bushings with new factory rubber. Using KMAC adjustible trailing arm bushings (to REDUCE rear camber as much as possible). Replacing the Dinan rear bar with the 20mm euro M5 Touring bar. Keeping self-leveling. Koni Sports in the front. Replacing the Dinan camber plates with -1/2 degree factory strut bearings. Replacing the Dinan springs with factory M5 springs. I'm keepng the Dinan front bar, and hope to be able to move it off of full soft...

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