Re: High Speed Vibes

[smarinel@neosoft.com (Steve Marinello@Newpark)]

>   While cruising to Jacksonville last night I was accosted by a Volvo 850
>turbo
>   wagon.  Defending the old girl's honor we leapt into the fray.  He faded
>   after 100 - faint of heart, I guess.  The accelleration from 80 (.5 bar) to
>   100 (1.3 - 1.5 bar = not full throttle!) was inspiring.
>   About the time I hit 85+, the volume level in the car undergoes a step
>   increase - virtually a roar.  From 90 on, things continue to get louder
>   w/minor shaking.  This is consistant since I've owned it (4 months).  Tires
>   are new (firestone affinity touring), front end aligned, original exhaust.
>    Car is quiet and Audi-like to about 82 mph.
>   How about anybody else?  Like to know if this is something I should be
>   concerned about, or just turn the stereo up.
>
>I was plagued by a "vibration" that persisted across new wheels and tires
>and multiple spin balances (I watched the guy make it 0.0 on all axes)
>with "perfectly round" wheels and tires. Finally, an "on-car dynamic balance"
>fixed the problem, no more vibration.
>
>                                        -RDH
I have also seen this same series of attempts to clear up the problem a
couple of times.  Once the on-car dynamic balance worked..one time it
didn't.  Both turned out to be questionable hub-centricity...banged up and
mishandled factory wheels and "just-not-right" aftermarket alloys.  Both
were cured permanently with grinding and hub inserts.....not real cheap,
but cheaper than new wheels.

steve

Stephen A. Marinello, Ph.D.
Newpark Resources, Inc.
P.O. Box 6411 - Metairie, LA 70009
504/838-8222