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All new suspension components. Still having shimmy/vibration issues.
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09-15-2018, 01:47 PM | #1 |
BMW Portland
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All new suspension components. Still having shimmy/vibration issues.
I'm getting frustrated with this constant battle of chasing vibrations, oscillations, and shimmys. Heres what i've dealt with and fixed over the past 4 months so far.
Vibration under braking. Turned out to be warped rotors. Replaced front rotors and pads. Vibration at freeway speeds. Turned out to be 2 bent front wheels. Replaced all 4 wheels and tires. Vibration under braking (again). Turned out to be control arm/thrust rod bushings. Replaced with the M3 upgrade kit, along with all new suspension mounts, hardware, and ST coilovers. The car is currently at 90k miles. During the suspension/control arm refresh I checked the tierods and swaybar links and they felt rock solid. After the alignment, which everything aligned as it should, I noticed a new shimmy/vibration at freeway speeds. The vibration typically happens under mild acceleration around 70/80mph. Around those speeds and above there is a high frequency shimmy in the steering wheel, which is visibly noticeable when I take my hands off the wheel. It is nowhere near as noticeable as the other ones, but it is still bothersome especially after all the work I have done to the car. Does anyone have any idea as to what it might be? At this point i'm entirely stumped. Thanks y'all
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S |
09-16-2018, 01:33 PM | #2 |
Private First Class
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did you just bend another rim?
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09-17-2018, 08:06 AM | #3 |
BMW Portland
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No. They balance just fine. I haven't tried road force testing them, but thats because I haven't had a reason to. Both my old front wheels bent from hitting a metal plate in the road and I haven't had a incident similar to that since getting the new wheels.
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S |
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09-19-2018, 02:33 PM | #4 |
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Drives: 2009 335i - Sport PKG
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get the tires and rims checked, road force balanced again., I had similar problem and turned out to be same pattern as yours and in the end after fixing bent rims, front suspension parts also I replaced rear shocks which were shot, turned out to be tire set, they were new, so I got replacement tires, so far car runs good
Last edited by SHEEDI; 09-19-2018 at 09:21 PM.. |
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09-19-2018, 02:38 PM | #5 |
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Drives: 2009 335i - Sport PKG
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Usually when you have hit front, most probably your rear got hit also, you know what I mean, you didn't avoid rears white hitting fronts , get all four rims checked. my two shops overlooked and initially they said its one rim bent, turned out I had three bent rims
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09-19-2018, 04:55 PM | #6 |
BMW Portland
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Going to road force balance them today to double check everything. I really hope they aren't bent, as I just got them. When my OEM wheels were bent I knew exactly when it happened. With these, I cant recall any instance where I hit a pothole or big bump. I also have quite a bit of sidewall with my setup, so if they are bent I'll be impressed.
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S |
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09-19-2018, 11:03 PM | #7 |
Colonel
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I had a vibration over 80mph, It did not bother me to much. I happened to get a great deal on Yellow Koni front struts. After changing the front struts and strut bushing its smooth even over 100mph. I have a 09 335i with 95k miles.
The struts did not have much resistance and the strut bushing was about 1/4 inch shorter then the new one. good luck |
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09-20-2018, 08:12 AM | #8 | |
Second Lieutenant
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Quote:
Check out this video: The first 30 seconds are all you need to see. I'm not sure if this guy's problem was installation error or crappy Chinesium parts (or a bit of column A and a bit of column B), but in any event, an upper strut bushing had bit the dust and the failure was manifesting itself as a shimmy in the steering wheel at highway speeds. This instance was obviously a pretty bad failure immediately visible to the naked eye, but I suspect a part that is "only" severely worn, would cause a similar problem. |
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09-20-2018, 10:51 AM | #9 | |
BMW Portland
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Quote:
After throwing my front wheels and tires on the roadforce machine, there was only the slightest imbalance on my front left wheel. It only took a 15g wheel weight to fix it, which seems like a really small imbalance for the vibration I was feeling. Both wheels had no bends or deformations in them. I haven't had a chance to drive on the freeway yet, but the steering does feel a hair smoother. Will check back after I put some more miles on it.
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S |
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