From Yello911_at_aol.com Fri Oct 18 14:17:55 1996
Date: Fri, 18 Oct 1996 17:17:01 -0400
Subject: My 325is problem and question
I have a 1987 325is with 111,000 miles on it. I have had the car about 4,000
miles. When I bought the car, it had the factory 14" rims with pirelli
185/60/14 on it. The steering wheel vibrated, shook, shimmyed, left and
right between 50mph and 60 mph. So I had the tires balanced. It remained
present. I bought new wheels and Tires. 16 inch TSW Stealth wheels with
205/50/16 tires. The problem persisted. Between 50 and 60 miles per hour, the
steering wheel shook. Additionally, the car would start to vibrate from the
rear between 80mph and 100mph. I ordered another set of new wheels and tires.
TSW Hockenheirm R 15X7 with 205/50/15. The car did the exact same thing. at
the exact same speeds. So I have been told to have the wheels and tires
balanced on the car, which I intend to do. Have you ever heard of this
problem before? My mechanic checked out all the suspension pieces, bushings,
swaybars, shocks, springs (Dinan stage I stuff) and they looked fine. Any
suggestions. Even if I do get the front end to stop shaking, the rear can't
be balanced on the car. Help!!
Thanks for any help.
It sounds to me like the rotors may be out of balance. To cure this
you may have to replace them with factory original BMW rotors, BMW
balances the rotors, I don't know if anyone else does. Also you could
try mounting the tires differently, remove the wheel/tire, turn 1/4 turn
and reinstall. I'm only talking about rotating the tire on the hub, not
dismounting the tire from the rim. Try this then go for a test drive,
see if vibration is better/worse, keep a log of your results.
How experienced with BMWs is your mechanic? The control arm bushings need
to be replaced every 100k or so and one of the major symptoms is the
vibration problems you are describing. Also shocks, if the shocks
are not replaced every 100k, you are asking for trouble. And it
can lead to problems. How long ago was the Dinan equipment installed?
hope this helps
'84 318i (sold...)
| Dale Beuning |
| email: dale_at_unofficialbmw.com |
| web: http://www.unofficialbmw.com |
From Yello911_at_aol.com Sat Oct 19 14:07:09 1996
Date: Sat, 19 Oct 1996 17:06:37 -0400
Subject: extra set of wheels
Thank you so much for your prompt response. These rotors have a questionable
history. They may or may not have come off this car, and put back on this
car. The last owner had cross-drilled ones on it but put them on the 89 325is
Dinan Turbo he bought. So these rotors might have come off that car. And were
not marked as to which side or front to rear they belong (if it even
matters). But on Monday, I''ll order some rotors and pads. I'll have
something to do next weekend.
The suspension had Dinan front and rear swaybars on it, but they went on the
turbo before I bought it. The last owner had Eibach springs on the car, but
put them on the turbo and put the Dinan springs on this car in Jan. 96. So
the suspension work is recent. The shocks are Bilstiens valved by Dinan and
have less than 10K miles. I am just going to have to sort out all these
problems before I do any track events. It will take time, but I' m sure it
will be worth it. The car pulls nicely to 145mph. Where drag limits its
speed, I think.
The extra set of wheels and tires are not available. They are 16 X 7.5 TSW
Stealth, like I said, but in assessing why the car shook at speeds, I took
them to a place to computer balance them. They found that two were not
"true", completely round. They looked great on the car. The style is the new
318ti Sport wheel, but the quality just wasn't there. The Hockenheirm R we
found out were perfect. The same place put them on the machine and they
proved to be of a higher quality. Both are made in S. Africa and I got them
from Motorsport Design in San Antonio Texas. Billy Mitchell was my salesman.
He was most helpful allowing me to swap out the 16" with 15".
Phone number is 210-366-3636. the 16" wheels were about $1300 mounted and
balance. The 15" were 1250 mounted and balanced. Locally, they would have
been about $2000. It was a big savings. I still have the factory 14" which
I'm going to put track tires on when the day comes.
Well, thank you for your help and I'll keep you posted.
From Yello911_at_aol.com Tue Oct 29 10:44:58 1996
Date: Tue, 29 Oct 1996 13:42:41 -0500
To: dale_at_unofficialbmw.com (dalebeuning)
Subject: The result
It was the rotors. They had a dubious history and when they got removed and
the new ones were put on, the problem went away. Store this info in a safe
place. I hope it is useful to other BMW owners.
Anyway the car is much more enjoyable now. Thanks.
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