>>>>> "Scott" == Scott Mackay <Scott.Mackay@intl.sematech.org> writes:
Scott> For tires, I am
Scott> actually running 215/70-15's, ~1% OVERsize. I
Scott> assume the diff has not been replaced, something I
Scott> can check, but a change to 3.45 gears cannot
Scott> account for this large difference.
Scott> Can anyone shed some light on the
Scott> situation???? I am willing to recal the spedo, and
Scott> can swap in a known working backup, but I don't
Scott> understand the situation. Given the LARGE tire
Scott> size on the '6 compared with all of the TR models,
Scott> no change in gearing can counteract the tire
Scott> diameter gain to create an undersize situation.
I'm running 195/60-15's on my TR-4 and it reads about 9% high.
That's about what I'd expect for such an undersized tire, but
I had them laying around and I'm cheap. The TR-6 has the same
base tire size as the '4, but a different width (and I'm
running early TR-6 rims) but the other bits in the equation
are the speedo (Mine is I think 1192 revs/mile) or the drive
gear on the tranny (I don't know haven't looked at it in
years).
-MM
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