vibration/shudder at 70 - possible alternatives (other than wheel balance?)

[juliemac57@hotmail.com (Julie Macfarlane)]

<message>
This is this the thought police.
You have exceded all of the road speeds for the United States.
Please surrender yourselves to the local speed shop.
</message>



Julie Macfarlane
Menlo Park Research & Development
Internet Application Developer
www.menloparkrandd.com
www.montgomeryweb.org
Amsterdam NY



>From: "ATS - Patrick Bureau" <txrocco@sbcglobal.net>
>To: "Drew Teague" 
><roccnroll@hotmail.com>,<kcollins1@socal.rr.com>,<scirocco-l@scirocco.org>
>Subject: RE: vibration/shudder at 70 - possible alternatives (other than 
>wheel balance?)
>Date: Tue, 22 Apr 2003 09:21:33 -0500
>
>the prowler has 205-50-15 and it occured around 79-84MPH
>the daily driver has 185-60-14 it occured 76-80MPH
>
>humm... I think we are on something..
>
>ATS - Patrick Bureau - txrocco@sbcglobal.net
>
>
>=>-----Original Message-----
>=>From: scirocco-l-admin@scirocco.org
>=>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Drew Teague
>=>Sent: Tuesday, April 22, 2003 8:52 AM
>=>To: kcollins1@socal.rr.com; scirocco-l@scirocco.org
>=>Subject: Re: vibration/shudder at 70 - possible alternatives (other than
>=>wheel balance?)
>=>
>=>
>=>>My Integra with the problem that turned out to be CV had its problem
>=>>between about 37-43 mph - a fairly small, very specific speed range and
>=>>never outside of it.
>=>>
>=>>--
>=>>Kevin Collins
>=>
>=>Well, I would think a problem like this would occur when the
>=>revolution of
>=>the CV's etc was sympathetic with the frequency of whatever is
>=>vibrating.
>=>It would climb when it gets close, peak, then drop out as you accelerate
>=>through.  If you went fast enough, it would probably reoccur in
>=>the next 1/2
>=>division of the frequency (I think... It's been a while since physics
>=>class...)  I know there is a principle concerning this.  I apply it to
>=>guitar playing with the use of harmonics..
>=>
>=>If the same item would be causing the vibration (we're ASSUMING at this
>=>point) in all Rocc's, different cars would have vibration
>=>occurrences at a
>=>slightly different range of speeds, due to different tire sizes.  (bigger
>=>tires have greater speed at same RPM than smaller tires)
>=>
>=>With 195 50 R15's, mine peaks at around 75-77 mph
>=>
>=>
>=>**Drew Teague**
>=>Harrisburg, PA
>=>
>=>'84 8v Rocco --  "Bruise"
>=>'85 BMW 318i
>=>
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