Fahrwerk: Fahrwerksprobleme ohne Ende

[Erich]

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75+mph shimmy with new suspension...

Unable to get rid of a shimmy that turns into a serious shake at 115+

- Complete new front end by MEYLE except struts
- New Dogbones in rear
- Roadforce balance by BMW
- New tires (Cheaper tires though, lower brand which is made by FALKEN)
- New aftermarket brakes (Ive used these same brakes in my VW CC without issues)
- Old new stock driveshaft and center bearing installed
- 32mm Steering nut tightened up
- New transmission mounts

I had my mechanic install the suspension components, he has since inspected it twice and found nothing, checked every nut, nothing. Had BMW road force the tires and even indexed one of them. All 4 fell within spec. Had the BMW tech inspect the suspension as well and he found nothing wrong. The road force did help quite a lot, but still not where it should be. Steering is very tight and responsive. Struts do seem a slight bit soft but I think they are still in great shape. Strut mounts/bearings look to be ok, hard to tell.

This shake usually starts very slightly at 60mph, goes away and comes back in at 75+. At 115mph and up it just gets worse and worse to the point where I was afraid to hold it at that speed. What could it be? I cant think of anything else.

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What brand did you use for the idler arm when you replaced everything up front? I just did the whole front suspension on my car and the Lemforder idler arm I bought was junk. A quick query on the E34 bimmerforums group on facebook brought up 5 other people with recent bad experiences with their Lemforder idler arms that matched mine - the tapered hole wasn't drilled properly to draw the ball joint from the center link all the way up; and the bushing was binding up. One guy's bound up so bad it unscrewed itself.

The big symptom I had was the car pulled strongly to the right, despite being aligned perfectly. Replacing the Lemforder idler with a Meyle solved the issues, and the car now tracks perfectly (without any additional alignment work after swapping the arms).
My Cars : '91 M5, '13 E92, '89 E32