spedometer alterations/calibrations

[C1J1Miller at aol.com]

"Mark W. Byrum, Jr." wrote:
> 
> Can VDO/Audi speedometers be calibrated to compensate for different
> (as opposed to stock) tire diameter?  My '89 80q seems to have a lot
> of room around the tires in the wheel wells; if a calibration could be
> done, somewhat larger tires might be installed.
> Just a thought.
> TIA,
> Mark

Here's info from my site:
http://members.aol.com/c1j1miller/body.html#Spedometer/Odometer

Before you consider this, adding larger diameter tires to your car will reduce the apparent horsepower... due to the reduction in gearing.  Certainly something to consider...
Chris