Bob :
Definitely check out Tony Rhode's web site (as suggested by Geo Hahn).
At the risk of being too obvious, check the accuracy of the
odometer/tripmeter. If they are also wrong, then you have a gearing
problem. If they are right, then you just have a speedo head that reads
high (which is a fairly normal consequence of wear in these units). The
tach uses the same mechanism, and is also prone to read high.
TR3s (like TR2 through early TR6) did not have different speedo drive
gears for different rear ends, tires, etc., but instead changed the
entire speedo head. As explained on Tony's site, there is a calibration
number printed on the face of the speedo that indicates which unit it
is.
Randall
Kinderlehrer wrote:
>
> Hi Gang,
> This should be the biggest problem with my TR3A, but I may as well ask
> anyway. My speedometer reads very high. It will be reading 80 mph (about
> 3500-4000 RPM) and everyone is passing me. I'm actually doing about 70
> according to my wife who was following me.
>
> I have 165R15 tires, no overdrive, and I have no idea what the CPO (CHEAP
> Previous Owner) did with the rear end but I am pretty sure he swapped
> transmissions.
>
> Is there anyway to calibrate the speedometer? I don't see any choices for
> different speedometer gears in Moss, are they available elsewhere?
>
> TIA,
> Bob
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