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Date:         Mon, 6 May 2013 15:51:39 -0700
Reply-To:     "sailingfc @dslextreme.com" <sailingfc@DSLEXTREME.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         "sailingfc @dslextreme.com" <sailingfc@DSLEXTREME.COM>
Subject:      Re: speedometer accuracy
Comments: To: Stephen Grisanti <bike2vcu@yahoo.com>
In-Reply-To:  <1367878228.13994.YahooMailClassic@web164504.mail.gq1.yahoo.com>
Content-Type: text/plain; charset=ISO-8859-1

I've used my GPS to check my speedo too. I have 27x8.50-14 Bridgstone Dueler ATs and the speedometer is dead on accurate. Unfortunately, I did not get to checking the odometer against the GPS before my engine fire sidelined me. If the odometer is reading more miles than the GPS AND the speedo is reading higher than the GPS, then of course the wheels are turning more times per mile than actual. One of the Vanagon specific suppliers has an in-line speedo converter that can change the revs. per mile the speedo sees, but I recall that is an expensive option. I guess you have to look at the big picture; if you drive 3000 mile between oil changes and your speedo/odo is off by ~13% (70 vs. 62), you've actually driven about 2,640 mile. Do you change the oil or wait a little bit longer till your odo. reads about 3,400 miles? (all number are approx./rounded off) Sometimes it's easier to put a label on the dash that reminds me to "- 5" (minus 5) for my actual speed.

-Dick- 78 Scirocco 87 Vanagon Syncro 12 Gold TDI

On Mon, May 6, 2013 at 3:10 PM, Stephen Grisanti <bike2vcu@yahoo.com> wrote:

> Stock tire size on my '87 was revealed to be reading slow when we borrowed > "Samantha" the GPS from neighbors for a trip. In addition to reminding us > about all the turns we'd missed she informed us that at an indicated 65 we > are really doing about 58. Here I thought everyone else was really hauling > and it turns out I'm the one who is not. > Stephen > > --- On Mon, 5/6/13, Mike Miller <mwmiller6@ATT.NET> wrote: > > From: Mike Miller <mwmiller6@ATT.NET> > Subject: Re: speedometer accuracy > To: vanagon@GERRY.VANAGON.COM > Date: Monday, May 6, 2013, 4:54 PM > > I'm interested too. I've put 225/75-15 BFGs on and my speedometer is off, > according to my GPS, by more than the percentage the difference in size > between > that and stock predict. I thought the stock VW speedometers were off but > on the > high side as Karl indicated, but the percentage is greater, meaning the > stock > was reading too slow? > > Also I have a scan gauge and it indicates about 100 RPM less than the > diesel > tach idicates? Which is likely to be more correct and how does each > determine > RPM? > > Mike in Cotati > > > > > ________________________________ > From: Karl Ploessl <karl.ploessl@GMAIL.COM> > To: vanagon@GERRY.VANAGON.COM > Sent: Mon, May 6, 2013 1:29:08 PM > Subject: speedometer accuracy > > so I finally got a GPS in my van. And what do I notice? > Speedometer says 60 mph and GPS says 45 mph! At 70 (speedometer) the GPS > says 62! > I am running Michelin Agilis 61 in size 185/14 C and it is a Westy 81 > aircooled. And it is in Delaware to satisfy Scott. > The question I have: does this discrepancy also affect the odometer? > > ------ > Karl > 1981 Westy "Jenny" > 2000 VW Jetta GLS VR6 > Wilmington, DE >


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