help understanding rpm/ratio

[joel nevin]

Tire size plays a key role in speed.
http://www.car-videos.com/tools/speedrpm.asp
HTH
--- Nicholas  Lawrence <nick at beol.net> wrote:
>     When comparing the trans and rear differential
> between a '90 200q and a
> '91 200q I see the '90 listed as having a final
> drive of 3.89  and the '91
> final drive of 4.11. I believe this represents a 5%
> difference.
> Transmission gear ratios are listed as the same.
>     Both cars have a speed in fifth gear of 25mph
> per 1000rpm. And from
> actual observation cruising rpm @ 65mph are the
> same.  I know the
> speedometer is off on the '91, (checked by other
> means) and this is reported
> to be common situation.  The tire size on the '90 is
> 205 and on the '91 its
> 215.
> Could this be the difference?  Am I overlooking
> something?
> Reason for the research, I may need to replace the
> trans on my '90 and I
> have a '91 available.
>    TIA
> Nick
> '90 200 tqa
>
>
>


__________________________________________________
Do You Yahoo!?
Yahoo! - Official partner of 2002 FIFA World Cup
http://fifaworldcup.yahoo.com