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      11-28-2016, 11:04 PM   #1
aututto
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Angry Helicopter/Flutter sound?

Hello,

Okay so I got an e92 328xi beginning of this year. Been a great car, but I accidentally whopped a big pot hole the end of summer at about 10mph which put a slight bend in the front right rim. Never noticed much, but after a few 600 mile round trip drives a flat spot right where the rim was bent developed, and gave the tire an odd noise. So I had the rim straightened (full reman actually) and got a new set of dws 06 for the front. However I still could faintly hear that flapping/helicopter sound. It's been about 1000 miles and it is still there! No steering wheel vibration (unless maybe you just rest your fingers on it), drives straight, I can feel it faintly through the floor board, drives in a straight line, and no shudder when braking. I had my bmw indy mechanic (who is quite the bmw lover, has owned multiple) and he said that it can't be a wheel bearing, we threw it up on the lift and everything felt tough out front. It's faint and only noticed at 50 up on a smooth highway. My driver side has two very very light practically indistinguishable bends, surely not enough to make noise when well balanced. Whats the next step? Road force balance?

Thanks to all in advance!
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      11-29-2016, 01:53 AM   #2
galahad05
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Straighten the wheels, or better yet replace them. Loading up with lead weights will only temporarily mask the issues.

Straightened wheels are going to be weaker than undamaged wheels. If the bends are minor then you should be okay. If the bends are pretty severe then straightening them will leave them very prone to bending right in the same spots again, so better to replace there.
Also, if the repair requires welding or there are cracks, replace instead.
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      11-29-2016, 02:21 AM   #3
galahad05
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Oh I see I didn't really read all the details of your post. My bad.

You already had it straightened. Question: when the new tire was put on the remanufactured wheel, it was balanced I assume.

You can try a road force balance. If that doesn't work, then your next step is to repair the two left-side wheels and balance the sets.



So, in a nutshell, yes, you're on the right track. Rebalance with the best machine out there, and if that's not enough, do the left side wheels/tires as well.
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      11-29-2016, 07:51 AM   #4
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front axle ?
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      11-29-2016, 08:21 AM   #5
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Quote:
Originally Posted by frenchi View Post
front axle ?
I'd be more inclined to a spot on the bearings or race.
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      11-29-2016, 12:43 PM   #6
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Keep it simple folks. OP already mentioned three bent wheels. These are the most likely culprit(s). If these turn out to be dead ends, then the less obvious/less likely solutions come next.
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