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Old 07-11-2002, 10:27 PM   #1
MatyBMW
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Smile HELP!! E30 Diagnosis :) Wise ones, please read..

Thanks for the help in the past guys.. Especially Randy.. your prediction on the wheel bearing was correct!

Heres the situation with my E30 since my front two TSW rims were re-finished and put back on the vehicle:

PROBLEM:

-Front of vehicle shakes at 130km/h and above
-Does not shake the steering wheel, it shakes the frame of the vehicle
-Shake feels like it is coming from the front of the vehicle

INFORMATION:

-87' 325is
-TSW Rims, 2 front rims were just refinshed and unbent. Also, new tires were put on.
-Front rims have spacers and centering rings
-Rear tires have 30% tread, and rear rims appear to be fine
-Shake does not occur with stock rims and tires

HISTORY:

-Before rims were refinished, vehicle would produce severe steering shake between 70 and 110km/h.
-Re-finishing rims solved the steering shake but produced the frame shake after 130km/h which i did not experience before
-I currently have a bad left front wheel bearing that needs replacement.

HYPOTHESIS:

-COuld the wheel bearing cause the shake after 130km/h?
-COuld the spacers be put on incorrectly? (i.e. not centred)
-I noticed that the front right centering ring was cracked, could this pose a problem?
-Any other thoughts would again be greatly appreciated.

Thanks again fellow enthusiasts!!!
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Old 07-12-2002, 01:58 AM   #2
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My input:

1. Fix bad wheel bearing.

2. Wheels that use centering rings are not as good as wheels that are truly hub-centric (especially on front-wheel drive cars). I had purchased a set of true BBS rims to replace other rims with centering rings. My input: centering rings are garbage.

3. A cracked centering ring would definitely cause trouble. Again, my input: centering rings are garbage.

4. You did not mention if you had your wheels re-balanced after working on them. You should re-balance them if the tires were removed.

Good luck!
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Old 07-12-2002, 08:04 AM   #3
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Smile

Quote:
4. You did not mention if you had your wheels re-balanced after working on them. You should re-balance them if the tires were removed.
Yes, the front tires were rebalanced. The last time the rear tires were rebalanced was about a year and a half ago when I put new tires on, however they should be fine.

Appreciate your input. Anyone else have some other ideas?
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Old 07-12-2002, 09:09 AM   #4
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Sounds like one of the wheels is not properly centered. Also try swapping the wheels front to back.

Serge
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Old 07-12-2002, 10:05 AM   #5
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My first guess is the same as everyone else regarding the centering ring.

If that doesn't help, my second guess is the actual tires. How long did you drive with the wheels bent before? The tires might have a flat spot due to a panic stop or simply bad tread wear from bouncing on that bent wheel for a while... this cannot be diagnosed by a balancing machine unless you go to certain tire shops that have an "on-road simulated" balancer.

Good Luck
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Old 07-12-2002, 10:22 AM   #6
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He said that the tires are new.

SL

Quote:
Originally posted by empowerd
My first guess is the same as everyone else regarding the centering ring.

If that doesn't help, my second guess is the actual tires. How long did you drive with the wheels bent before? The tires might have a flat spot due to a panic stop or simply bad tread wear from bouncing on that bent wheel for a while... this cannot be diagnosed by a balancing machine unless you go to certain tire shops that have an "on-road simulated" balancer.

Good Luck
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Old 07-12-2002, 01:20 PM   #7
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Quote:
Originally posted by M3West
My input:



2. Wheels that use centering rings are not as good as wheels that are truly hub-centric (especially on front-wheel drive cars). I had purchased a set of true BBS rims to replace other rims with centering rings. My input: centering rings are garbage.


Good luck!

I would agree with M3West. My g/f got a new set of rims for her civic and the place she got them from did not have the center rings in stock, the car vibrated like a mother F'er. When we put the rings on problem gone. Replace the center rings first, that would be the cheapest way to go.
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Old 07-12-2002, 01:22 PM   #8
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hey kevin cud that be the problem with my cuzins civic? well see he will go like 180km, the steering wheel wont shake but there is a lot of vibration in the seats and even the door panels etc. shud he replace those rings?
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Old 07-12-2002, 04:55 PM   #9
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centering rings

But the centering rings still make a full circle so it should still do the job.

I'm thinking I might have them re-balanced. But have them done with an on car balancer which balances the wheel assembly brake rotar and hub, all as one rotating unit. These also balance at MUCH higher speeds.

Or, maybe order the BMPD.com bolt on spacers. They are like centering rings and spacers all in one. That may solve the problem.

Not sure though,
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