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BMW 3-Series (E90 E92) Forum
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<PROBLEM ID'ed> Anyone else experience creaking with M3 sways?
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10-16-2013, 05:45 AM | #23 |
Brigadier General
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Reporting back in - found the problem and partially fixed it. The sound is not coming from the sways at all...
..it's a combination of the front spring perches and the race camber plates. One of the symptoms of the sound was that when the coils were freshly installed the first time, they made zero noise until after the first rain. Since then they have been different levels of noisy- but always making some sound. Did a lot of digging on teh interwebz and finally found consistent reports of folks getting noise from linear springs + thrust sheets + race camber plates due to dirt working its way between the springs and the spring perches. Since the thrust sheets allow rotation, any dirt and tiny rocks wedged in there make noise and vibrate through the spring, getting amplified and then being solidly coupled to the chassis through the race camber plates, getting further amplified by the chassis into the cabin. (Partial) solution: I cleaned the upper and lower perch surfaces of all dirt and then greased all potential sliding surfaces with energy suspension waterproof grease - ironically the same stuff I used on the sway bar bushings I purchased. This stuff last a LONG time and was the recommended solution for others with this problem. The sound has been greatly reduced, but not eliminated. I have another idea to slightly decouple the spring noise from the chassis - I'm going to cut a 0.1" sheet of Buna-N rubber (50A durometer) into a ring the same shape as the top ring of the Vorshlag camber plates and install them in between the plates and the chassis as a damper pad. Being so thin, I don't expect it to damp all noise out, but it should help some with the higher frequency noises which these are mostly comprised of. Will report back once installed. |
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02-06-2014, 08:34 PM | #24 | |
Jumping Jack Flash
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Rep 1,692
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Drives: 2021 X3 M40i
Join Date: Nov 2012
Location: California (east of Sacramento)
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Quote:
__________________
2021 X3 M40i: M Sport Differential, Adaptive M Suspension.
Previous BMWs: 1971 BMW 2002, 1973 BMW R75/5, and 2011 BMW 335d Previous Other Vehicles: '67 Cougar, '70 911e, '86 Jetta Diesel, '05 and '12 Foresters, et al. |
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