Unless your tachometer is also "optimistic" (or in your case, pessimistic,
for that matter), then possibly determining what RPMs your car tops out at
would
be more accurate? If you know your axle ratio and tire diameter (tranny top
gear is 1:1 w/out OD), then there are a number of programs you can find online
that can calculate your speed based on gearing and engine speed. Does anyone
know how accurate the Jaeger tachs on these cars are? I know that the
speedometers are notoriously optimistic, but I don't know about the tachs.
Also, keep
your top up. I'm not advocating driving 100 miles an hour, but it'll be
certainly easier to reach those speeds with the reduced drag.
-Sean
In a message dated 11/20/2003 4:45:25 AM Pacific Standard Time, plz@shaw.ca
writes:
> Subj: RE: top speed
> Date: 11/20/2003 4:45:25 AM Pacific Standard Time
> From: <A HREF="mailto:plz@shaw.ca";>plz@shaw.ca</A>
> To: <A HREF="mailto:6pack@autox.team.net";>6pack@autox.team.net</A>
> Sent from the Internet
>
>
>
> >From: JIMMY RICHARDS
> >Sent: Thursday, November 20, 2003 3:44 AM
> >
> >I would add to the list of possibilities that your
> >speedometer might not be calibrated correctly.
> >
> >I had my wife drive along side my TR to verify my
> >indicated speed. I found that my speedo was reading
> >60 mph when she was indicating 75.
>
> Actually, if you have access to it, an even better way to determine the
> accuracy of your speedo is via a GPS device. If you don't have one yourself,
> try to borrow one from a friend who does. They are typically extremely
> accurate and can be configured to show the velocity. I wouldn't necessarily
> trust another car (even a modern one) as many manufacturers intentionally
> calibrate the speedometers "optimistically" (ie. the indicated speed is
> higher than the real speed). A GPS unit should not have this issue.
>
> Peter Zaborski -- CF58310 UO
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