>From: "William Davies" <bill@rarebits4classics.co.uk>
>
>Ultimately, whatever gear set you have is irrelevant - direct 4th gear will
>always be 1:1.
How is this true? It seems to me that a gearbox out of a GT6
would be assuming a different final driveratio and therefore a
different speed at any given rpm even in direct 4th.
>Also, why do you believe the Mazda is accurate? Our 9 year old
>VW Passatt is pretty optimistic and always was when it was a much younger
>car in my father-in-law's ownership.
One of the American car magazines (Road and Track?) did a article
on speedo accuracy recently and found that some manufacturers
apparently were purposely making optimistic speedometers.
>There are certainly too many variables to start pulling things apart - only
>calibrate against known measurrements. At the moment both of your
>calibration benchmarks are unknown variables, not a good starting point,
I didn't see any mention as to whether you were running stock
tires; that could have an effect. Do you have any measured miles
on the highways? I checked my speedometer on one of those once
and is seems to be dead on. The odometer, however is off almost
5%.
Best
Greg Rowe
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