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Re: Differential Calc Update

To: Larry Hoy <larryhoy@mcione.com>
Subject: Re: Differential Calc Update
From: Michael Graziano <mgrazian@ltcm.com>
Date: Tue, 23 Jun 1998 13:01:10 -0400
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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