Re: Speedo error

[vwxcross <vwxcross@worldnet.att.net>]

Mine does the same exact thing.  I use the trip spedo on vacation.

Bryan

Art Borin wrote:

> Sean E. Mulch wrote:
>
> > I set my cruise at an indicated 70 mph last night. I then reset my
> > computer and watched the average MPH for a few miles. It read 66 mph.
> > Now what is this telling us?
> > That our analog speedos are incorrect! They read on the high side!If
> > this is a percentage error, the inaccuracy will increase with speed.
>
> It's probably not a percentage error.  On my BMW motorcycle, the factory
> built in a 3 mph error on the high side.  I know because I mounted a
> bicycle computer to the beast and logged the difference at 20 thru 70 at
> 10 mph increments.  At all speeds, the speedo reads 3 mph high.  Almost
> everyone else on the beemer list that rides a R1100RS has a similar
> error.
>
> If accurate analog readings are important to you, get your speedo
> calibrated.  If you can't find a local shop, there are a few places that
> do it by mail order.
>
> Overseas speedo - 800-444-0292
>
> Palo Alto Speedometer - 650-323-0243
>
> > So all you 140+ top speeders are probably being duped by you incorrect
> > speedos. All published documentation I've seen indicates that our top
> > speed is around 128mph.
>
> Yup.  Ignorance is bliss!
>
> >
> >
> > Just so nobody screams at me about worn out tires causeing the
> > problem. I've only 6600 miles on my baby!
>
> Good point.  This would cause a percentage error, but probably only
> about 2%.  Your speedo error is more like 6%.  We can guess that the
> factory has an error tolerance spec. for the speedo, maybe +/- 5%, at an
> average tire wear point.  If your speedo is out of spec, maybe +10%, 128
> would indicate 141, not factoring in tire growth at speed.  A good
> theory, for sure.
>
> >
> >
> > Sean Mulch
> > 98 GLX Red/Blk
> > Stock.
> >
>
> --
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>
> Art Borin, Jr.
> AMSCO Wear Products Inc.
> P.O. Box 269
> 289 West Main Street
> Goshen, NY  10924
> Phone: (914) 294-1805
> Fax: (914) 294-1657
>
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