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Post suspension upgrade shimmy
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06-27-2018, 06:54 AM | #1 |
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Post suspension upgrade shimmy
Couple questions I have here if anyone could help me. I recently did a complete suspension refresh with M3 upper and lower control arms front and rear, Koni yellows with hr sports, and manzo rear toe arms on my E92 335. After driving for about a week I have noticed that I am starting to get a shimmy at highway speeds from the steering wheel and am trying to figure out the root cause.
I know for a fact my sway bar end links are shot due to the car being lowered so I ordered adjustable ones and will be installing today but would this be the cause of the shimmy? I have also been reading that not torquing the control arms at ride height could cause the shimmy as well. I used my jack and a 2x4 to jack up the front wheel hub until the car came off of the jack stand before I tightened them but could that have not been enough? Would putting the car up, loosening the control arms, dropping it back down on some ramps and then retightening possibly fix the issue? Please let me know any opinions. Thanks! |
06-27-2018, 08:15 AM | #2 |
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m3 control arms don't need to be torqued at ride height. Probably is something with your wheels. Bent rim. Out of balance. Vibrations were there but ware absorbed by squishy non M bushings. Now are just being amplified enough for you to notice.
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06-27-2018, 08:50 AM | #3 |
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From what I've read the lower thrust arms (mistakingly called control arms) do need to be torqued at ride height though, correct? Definitely a possibility for bent rim as the amount of potholes here is insane. Was going to get RFB next week just trying to think if anything else could be causing this shimmy besides that considering I just put everything on. Thanks!
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06-27-2018, 09:46 AM | #4 | |
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06-27-2018, 10:56 AM | #6 |
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Yes, I got an alignment the next morning and it was doing fine after that. The shimmy started about 4 days after I can post the alignment specs when I get home from work if that would help diagnose
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06-27-2018, 11:11 AM | #7 | ||
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Sway bar links seem to be out of the question even though they are bad but perhaps tire balance and re-torque could fix it. I guess I'll try those two options and then report back in case anyone else has a similar issue. |
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06-27-2018, 12:04 PM | #8 | |
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08-01-2018, 09:46 PM | #9 |
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Alright so not sure if anyone will see this but I have an update. Since the original shimmy I went and got a road force balance which actually got rid of the shimmy for a while. The roads here are rough though and it came back around 80mph. I recently replaced the sway bar end links and it went away again but yet again it started after a while of driving. Finally tonight I replaced my pre cat O2 sensors, this made me have to remove my steering rack and then place it back on. Driving home from my friends garage and there was absolutely not vibration! It's as if the car resets after having been lifted off of its tires. Does anyone have an explanation for this? Every time I've had the car up and put back down the shaking goes away for a bit but always comes back.
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08-04-2018, 11:31 PM | #10 |
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I would suggest getting another alignment done and at a quality shop. A lot of my local alignment shops are terrible compared to the performance alignment shop I go to. It's possible they just did a bad job.
Align to m3 specs and make sure to get a printout of the final specs Also, are you hooking up the sway bar links under load? When they're adjustable you want to make sure there's no preload on the sway bar. |
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08-09-2018, 07:06 AM | #11 | |
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https://www.e90post.com/forums/showthread.php?t=788761 Follow this DIY... I think he is using 18 3/4".... from the bottom of the wheel hub to the bottom of the fender. That's on a non-lowered car. Torque specs are about 75# to the subframe & 120# to the hub. You are also supposed to go back in there after about one month & re-torque them. It would be a smart move to do your tie rods "while you are in there" |
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08-09-2018, 07:12 AM | #12 | |||
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08-15-2018, 07:47 AM | #14 | |
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08-15-2018, 07:49 AM | #15 |
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08-15-2018, 01:09 PM | #16 |
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08-15-2018, 01:12 PM | #17 |
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08-15-2018, 01:14 PM | #18 |
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08-15-2018, 02:17 PM | #19 |
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Yeah I've been at a loss recently as well. Everything seems to be as snugged as it's supposed to be. I've been under the car too many times to count and dream nothing but control arms and sway bar end link noises. Maybe with some properly fitted adjustable end links the shimmy will actually go away but who knows. The bent rims probably are not helping my diagnosis either
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08-15-2018, 05:50 PM | #20 |
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when was the last time you re-balanced the wheels? I mean just to eliminate..
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08-15-2018, 09:41 PM | #21 |
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About 3 weeks ago had them road force balanced. They mentioned that my rims had a couple bends but they "got the hop out" as they described for the most part. The shimmy is pretty much immediately triggered at 80mph
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08-16-2018, 10:47 AM | #22 |
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I would say there's the culprit
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