Bob,
It's not an issue of ultimate top speed. It's the gentler sound of an XPAG
only spinning at 3600-ish rpm at 60 mph.
Bud Krueger
52TD w/4.3
"Bob D." wrote:
> > > One of our club members has a '53 MGTD, and was asking if
> > > there
> > > are any kits available for his car which would increase the highway
> > > speed. Perhaps an overdrive set up or tranny conversion to get more
> > > MPH.
>
> My understanding is that the MPAG's horsepower peaks at 5400 rpm with 50
> BHP. This is the horsepower required to push the car 80 mph. The rear end
> ratio of 5.125 (either by design or accident) yields 80 mph at 5400 rpm.
> Therefore, changing this ratio in either direction will actually decrease
> the top end capability of the car.
>
> So ironically, overdrive will make the car slower with regard to top end. On
> the other hand, a lower ratio is said to make the TD much more agreeable at
> highway speed. I'm the only member of our local T series club that hasn't
> converted to the MGA 4.3 rear end gears.
>
> BTW: The book "MG TD &TF GOLD PORTFOLIO 1949-1955" by Brooklands Books has
> lots of great stats and graphs on these cars.
>
> Bob Donahue (Still stuck in the '50s)
> Email - bobmgtd@insightbb.com
> 52 MGTD - NEMGTR #11470
> 71 MGB - NAMGBR #7-3336
> .
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