PDA

View Full Version : E30 3 deg neg camber on rear wheel!


DR.ZED
05-23-2009, 07:38 PM
Hello everybody. I have an 85 325e manual. Eibach lowering springs and very dead stock shocks.

No rust, and I've done a lot of maintenance items like motor/transmission mounts, driveshaft bearing and flex joint (that was fun). So here is my dilemma.

According to an alignment rack my driver's rear has almost 3 degrees negative camber and the passenger side about 1 degree. The car has Eibach sport lowering springs. I don't believe this car was in any kind of accident to warrant a bent control arm or the like, but it doesn't seem like there should be that much negative camber on that side.

If I jack the car up by the body and then lower the body with the support of a jack on the rear crossmember I can watch the bushing/bolt move about 3/4" of an inch in. There is no banging or noise from the rear at all. I managed a 1.55 at Mosport GP track yesterday but I didn't want to push more since all the wheels were out of whack. I can blame the dead lowering springs for the odd camber on the front, but my focus is the rear right now.

Looking at the rear suspension the travel up and down shouldn't affect camber but caster at it rotates up and forward.

I'm interested in getting some feedback. Car is up in the garage so if you want some pictures of a particular area I'd be happy to.

An interesting note is that the odd drivers side control arm seems to sit hanging further towards the ground than the passenger side yet that same side has almost 2 degrees more camber. Doesn't make any sense!

e30_kid89
05-23-2009, 11:06 PM
Others will chime in, but the way the E30 trailing arm works is the more lower you go, the more negative camber will you gain.

Take a look-see here:

http://www.e30m3project.com/e30m3performance/tech_articles/susp-tech/rear_curves/index.htm

adam325i
05-24-2009, 12:28 AM
Very intresting artical, favorited!

T.Dot_E30
05-24-2009, 01:01 AM
I have the same problem, -3 on the passenger side. -1.3 on the driverside both front a d rear.

iignite
05-24-2009, 09:46 AM
im also on eibachs and it seems like the passenger is lower than the drivers side. I just thought it was just the battery

craz azn
05-24-2009, 07:32 PM
Bent arm? Doubt it though. Check all the rear end bushings, maybe one side is worn out beyond belief...

echo
05-24-2009, 09:11 PM
I have 2.5neg on both sides which is what you'd expect with the springs I have (H&R Sport).

If it's not even side to side, replace your trailing arm and subframe bushes and go for another alignment. if it's still out, something is bent.