Philip E. Barnes wrote:
> Since the speedo in my car doesn't work, or rather doesn't
> indicate speed in MPH, I need some help from the list.
> I figured out the speed vs. RPM relationship based on the gear
> ratios and tire size for my non-O/D car and come up with 64 MPH
> in 4th gear at 3000 RPM. Does this sound about right?
Yes. A quick rule of thumb for a TR6, and probably as
accurate as a Smiths speedo, is to double the number shown
on the tach when in 4th, convert to the right range, and
read it as MPH. Thus, 2500RPM -> 50MPH, 3000RPM -> 60MPH,
etc.
My '74 TR6 has a speedo that reads about 20% high, and
also bounces at high speed. I have used the tach as
my "speed gage" for years -- such that even when I'm in
my '70 TR6, where the speedo works just fine, I ignore
the speedo, and use the tach to measure speed...
> You never get done fixing these cars, do you?
Nope, but that's part of the fun... :-) :-)
--ken
'70 & '74 TR6 Daily Drivers
--
Kenneth B. Streeter | EMAIL: streeter@sanders.com
Sanders, PTP2-A001 |
PO Box 868 | Voice: (603) 885-9604
Nashua, NH 03061 | Fax: (603) 885-0631
|