Let me weigh in on this one.
There is definately a difference in the tach to speed ratio if everything else
s not equal. Changing tire diameter will vary the
speedometer reading , as any tire shop will tell you. Also varying the ratio
of the differential will change the speedometer reading.
While you can calculate the speed by doing the proper math, all the elements
must be taken into consideration. the drive line does not
end at the back of the transmission where the speedometer cable is connected.
Joe
James Libecco wrote:
>
> The speedo to tach ratio still would be constant no matter what the
> rotational diameter is, but the final road speed will vary tremendously,
> depending on what the tire size is. On my 76 nonOD spit with my autox tires
> on, I have to drive an indicated 70mph/4000rpm to stay with 55 mph traffic.
> Sufficive to say, I do more damage to and from the track than racing.
>
> jim
>
> Not Really Richard,
> The Tach is connected to the motor / motor to tranny / tranny to
> speedo.
> Its a direct connect so tach to speedo is constant..
>
> Pat
>
> Bonilla / Colorado wrote:
>
> > do we not need gearing ratios, and tire sizes to
>make
> > this meaningful info?
> >
> > richard / colorado
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