Date: Wed, 24 Oct 2001 23:40:24 -0500
Reply-To: Stan Wilder <wilden1@JUNO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Stan Wilder <wilden1@JUNO.COM>
Subject: Re: spedo/odo error confusion
Content-Type: text/plain; charset=us-ascii
I'm using the 185 R 14--Michelin Agilis 61s.and a Spedo from an 85
Vanagon (in an 83 Air-Cooled) with the black box from a 805 spedo and the
85 Vanagon Speedometer that has an 820 on the face.
Too many numbers and getting confusing, but I'm getting a genuine 60
miles an hour when I clock between highway mile markers at 60 second
intervals.
My trip meter is very close to the odometer miles and the published
distances from one small town to the next. City to city is not an
accurate measure against published distances.
I resurrect some old 80-83 Westys as I find them and I always buy
speedometers when I find them in wrecking yards. (I avoid those that have
been wet.)
Just from my experiences with speedometers I have found that the ones
with just a little lag before they register 10 mph tend to be more
accurate, must be because they are tighter in some way.
I hope I've been able to add to the confusion.
Stan Wilder
83 Air Cooled Westfalia
On Wed, 24 Oct 2001 21:14:59 -0700 Todd Last <Rubatoguy@MINDSPRING.COM>
writes:
> The number "805" is the number of revolutions per mile that the
> speedometer is
> allegedly calibrated for at the factory.
>
> Todd
> '88 Westy
>
> Joe Romas wrote:
>
> > I would venture that the wrong spedo has been put in your van
> somewhere in
> > the past. There's a little number on the bottom of the face. My 84
> gl is
> > "805" and it's a VDO brand. It has something to do with your
> problems. Maybe
> > others will know more about the numbers.
> >
> > Joe
> >
> > ----- Original Message -----
> > From: "Richard A. Jones" <jones@COYOTE.COLORADO.EDU>
> > To: <vanagon@GERRY.VANAGON.COM>
> > Sent: Wednesday, October 24, 2001 6:47 PM
> > Subject: speedo/odo error confusion
> >
> > > I just returned from a 3100 miles trip in El Jefe. Well,
> > > 3100 according to its speedo, or rather its "odo"....
> > >
> > > I've know the speedo reads high from some time. Then
> > > I watched the odometer between some mile posts and
> > > decided it was high, too. I thought it was gear driven
> > > and should be OK even if the speedo was off because of
> > > the calibration of the spring. What do I know?
> > >
> > > I have the stock size tires--185 R 14--Michelin Agilis 61s.
> > >
> > > Then I decided to take advantage of I-70 which starts
> > > from I-15 in Utah, with mileposts to the east.
> > >
> > > Here's what I recorded
> > > my trip odo I-70 milepost
> > > 77.8 0
> > > 186.2 100
> > > 292.0 200
> > > 323.0 230 (Colorado state line)
> > >
> > > Converting to percentages:
> > > 8.4%
> > > 7.1%
> > > 6.6%
> > >
> > > So if I drove an arbitrarily large number of miles my
> > > odo error would be arbitrarily small? What's going on?
> > > Why should the odo error not be roughly constant.
> > >
> > > The only variable I can think of is the day started
> > > cool and warmed up as I drove, but only cool/warm,
> > > not cold/hot.
> > >
> > > Can anyone explain this?
> > >
> > > [Trip report and photos to come later....]
> > >
> > > Richard A. Jones
> > > Boulder, Colorado
> > > '81 Vanagon Mr Bus
> > > '87 Syncro Westy El Jefe
> > >
>
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