Re: rpms vs. mph

From: Ian Spencer (ian(at)sunbeamalpine.org)
Date: Wed Sep 13 2000 - 08:23:59 CDT


Scott,
If your car was factory equipped with an OD it would be stamped into the data tag. It is very possible that your have an OD rear end though. There
was a batch of non OD Series V's sent to North America with 4.22:1 rear ends. I have been replacing those 4.22's with 3.89's in the Series V's that I
have encountered and it makes a huge difference. It's more than likely that your tach is correct and you just need to swap rear ends. The black
Series V we just restored for Brian Shilt had the same problem. His car was undrivable on the highway. He is now very pleased with how it runs.

Scott Donnelly wrote:

> 4th gear, no over drive. I suspect tach error which is apparently common and a low geared axle are causing my rpms to be high. Perhaps my car was
> originally equipped with an overdrive?
> Scott Donnelly
> SV
>
> jeyerman(at)ix.netcom.com wrote:
>
> > Way, way off..... more like 3500RPM for 60MPH. Are you sure you are in top gear?
> >
> > Jan
> >
> > Scott Donnelly <oharajem(at)free.midcoast.com> wrote:
> > > At 50 mph I am turning about 5000 rpm. Does this sound about right or ismy tach off? If these cars were capable of nearly 100mph, alot must
> > happen within the next 1000 or so rpms!
> > Scott Donnelly
> > SV



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