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

[txrocco@sbcglobal.net (ATS - Patrick Bureau)]

The sign says 60, seems it mean Minimum in texas... most drive 80-95 at all
time...
common down , show ya how to weave in 5 lane traffic at 90mph

ATS - Patrick Bureau - txrocco@sbcglobal.net


=>-----Original Message-----
=>From: Julie Macfarlane [mailto:juliemac57@hotmail.com]
=>Sent: Tuesday, April 22, 2003 10:51 AM
=>To: txrocco@sbcglobal.net; roccnroll@hotmail.com;
=>kcollins1@socal.rr.com; scirocco-l@scirocco.org
=>Subject: RE: vibration/shudder at 70 - possible alternatives (other than
=>wheel balance?)
=>
=>
=><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@scir
=>occo.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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