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Date:         Sun, 19 Jun 2005 20:20:14 -0700
Reply-To:     TJ Hannink <tjhannink@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         TJ Hannink <tjhannink@YAHOO.COM>
Subject:      Re: Speedometer -- the straight scoop
Comments: To: Michael Elliott <j.michael.elliott@GMAIL.COM>
In-Reply-To:  <42B61F73.6000908@gmail.com>
Content-Type: text/plain; charset=iso-8859-1

The speedometer measures the number of revolutions that the drivers side front tire makes. On my camper, the calibration number is 805 meaning the speedometer is calibrated for a tire that will make 805 revolutions in 1 mile.

The tire manufacturer should be able to give you the RPM rating of the tire you are using. My Kumhos have a rating of 805 and I find that the speedometer is right on whenever I get an opportunity to check it.

If you find out the RPM rating for the particular tire you currently have on the front left of your van, you will probably find out it is about 8-9% diffferent from the calibration number on your speedometer. A competant speedometer shop should be able to recalibrate your speedometer to match your current tire selection.

Good luck,

Tim

Michael Elliott <j.michael.elliott@GMAIL.COM> wrote: I know this is a done-to-death subject, but I searched the archives and didn't turn up what I was looking for:

The facts, as I know them:

According to yesterday's "speedometer check" signs posted by the side of Interstate 8, my odometer is a smidge optimistic: when I had traveled 4 miles, the odometer read 4.1 miles. Close enough for me. 2.5% error.

The speedometer reads pretty low. According to the "Your Speed Is" automated trailers with giant speed displays parked on the streets AND according to my GPS, the speedometer is WAY optimistic: when I'm going 65mph the speedometer thinks I'm going 75. This is a fixed percentage: as I go slower, the mph error is smaller but the percentage error is the same. About 8 - 9%.

So the odo is acceptably accurate, the speedo is not so accurate. Anything a fellow can do other than just mentally correct the speedo reading?

--

Mike "Rocket J Squirrel" Elliott 71 Type 2: the Wonderbus 84 Westfalia: Mellow Yellow ("The Electrical Banana") Carlsbad, CA KG6RCR

TJ Hannink Goldibox - 1987 Vanagon Camper, Wolfsburg Edition 1981 Bluebird Wanderlodge, FC-33 Winter Park, Florida http://home.earthlink.net/~tjhannink/ http://groups.yahoo.com/group/wolfsburg_campers http://groups.yahoo.com/group/FC_wanderlodge FAVOR website: http://home.earthlink.net/~clubvanagon

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