[s-cars] Good news - bad noose

[Fred Munro]

Bob;

Typical symptoms of a bad lower control arm bushing. There have been several
posts about the high speed sweeper shimmy - a search of the archives should
turn up something.

HTH

Fred Munro
'94 S4


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Robert Myers
Sent: April 26, 2005 5:30 PM
To: s-car list
Subject: [s-cars] Good news - bad noose



Hi Y'all,

Suspecting a blown RF strut cartridge I pulled mine (Bilstein HD).  I
pulled out mu trusty BFPW and found I needed a BiggerFPW.  A four foot
piece of pipe took care of that.

The good news - the cartridge and the strut bearing both appear to be OK.

The bad news - the problem leading me to look at the cartridge wasn't
caused by the cartridge which could have been replaced under warranty.

The problem: a severe shimmy in the RF wheel/tire (it feels almost to be
airborne about once each revolution) during a high speed (85-90 mph) left
sweeper.  There is also a slight imbalance in that spot which can be felt
slightly at highway speeds.  The frequency of the imbalance vibrations
closely matches the shimmy frequency.  The shimmy goes away if I slow down
to 80 or below or accelerate to 95 or above.  My thinking was that a blown
strut might be failing to dampen out the vibration when at the natural
resonance frequency for the setup.

Other possible problems might be:

1.      tie rod ends
2.      ball joint
3.      subframe bushings
4.      lower control arm bushing

Getting in there with a pry bar and seeing if anything moves more than what
might be appropriate gave me no clues.

The bushings are all original ~ ten years old and have traveled nearly 220K
miles.

What have I overlooked?  Any suggestions?


_____
Bob
Http://Chips-Ur-S.com

'95 urS6 Cashmere Grey
RS2 turbo/EM
Lucas/Delphi 37# injectors
Custom MRC software
Stromung Exhaust sans kitty
BIRA System 3 brakes
Custom brake lines
Centerforce clutch
100/130 watt H1 Eurolights
Ultranator alternator upgrade
RSB
EGT
Samco Hoses
2 Watt dash light bulbs

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