All gauges have been checked.
Tach: Dwell/Tach meter
Speedo: Friend in car next to me.
Mike
Larry Hoy wrote:
>
> Your math looks right, have you checked your speedometer?
>
> Larry Hoy; Denver, CO. USA
> 1969 MGB Roadster
> 1987 Jaguar XJ6 VDP
> "It's not how fast you go, it's how fast you go fast"
> =========================================================
>
> > -----Original Message-----
> > From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
> > Behalf Of Michael Graziano
> > Sent: Tuesday, June 23, 1998 8:39 AM
> > To: MGList
> > Subject: Differential Calc Update
> >
> >
> > OK. I sat at home with my manuals, and my MS Excel and did
> > the math.
> >
> > My tires are P155/70R13's. The wheel radius is 11.050
> > inches (and therefore, the wheel circumference is 5.79
> > feet. So at 4000 rpm, the car should run the following
> > speeds:
> >
> > 3.72 differential: 70.70 mph
> > 3.90 differential: 67.43 mph
> > 4.22 differential: 62.32 mph
> >
> > So, I'd have to have a 5x to 1 gearing in my differential
> > to explain 50mph at 4K rpm. Definately not the case. Where
> > to next?
> >
> > BTW - when doing the calc, using the 3rd gear ratio of
> > 1.433:1, I'd be doing 50 mph @ 4K rpm. BUT I KNOW I'M IN
> > 4TH.
> >
> > Can it possibly be a tranny problem?
> >
> > Mike
> >
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