Auf BF USA hatte einer 8 Monate lang mit sowas zu kaempfen mit seinem E32 750iL, hier die Kurzform 01/2018:
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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Heute die Loesung:
Just an update to close this issue out. Turned out to be the tires and or wheels. Swapped a set of E60 wheels with Michelin tires (used but good) and the vibration/shimmy was all gone. Took it up to 85 with no issues. Not sure if my old style 3 wheels are bad/bent or if its the tires.
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Timm sagte in dem Thread folgendes, mit Kopie der Service Info:
Vibrations over 60 MPH are usually due to the rear axle (or drivetrain components) rather than the front suspension which has a resonant frequency in the 50 MPH - 60 MPH range. BMW allude to this in the document below:
http://www.meeknet.co.uk/e31/Timms_b...20Problems.pdf