[DeTomaso] Question about modifying ZF gearing for high performanceengine.

[boyd casey]

Dawg,
I only mention 6800 rpm because thats the RPM thats quoted when the original
Pantera top end is mentioned. 168 mph in 5th gear at 6800 rpm. I would
rather count on more horsepower and torque at lower rpm then increase the
chances of throwing a rod by over reving the motor for long hauls at top
speed (like your runs at the silver state).
Boyd

On Fri, Mar 12, 2010 at 10:10 PM, Mad Dog Antenucci
<teampantera at yahoo.com>wrote:

> I have to agree except I'd do the taller 5th.
>
>
> Mad Dawg Antenucci
> Team Pantera Racing
> The 1st & still the only vintage race team in open road racing
> www.teampanteraracing.com
>
>
>
>
> ________________________________
> From: Will Demelo <wdemelo at cogeco.ca>
> To: detomaso at realbig.com
> Sent: Fri, March 12, 2010 1:44:04 PM
> Subject: Re: [DeTomaso] Question about modifying ZF gearing for high
> performanceengine.
>
> I have the  3:77 R&P and taller 5th gear. I wouldn't do both again. I would
> be happy with the 3:77s alone as the revs in 5th are a tad low at highway
> cruising speed. I absolutely love the taller gearing on the street running
> through the gears.
> Will
>
> --------------------------------------------------
> From: "boyd casey" <boyd411 at gmail.com>
> Sent: Friday, March 12, 2010 4:25 PM
> To: "De Tomaso List" <detomaso at realbig.com>
> Subject: [DeTomaso] Question about modifying ZF gearing for high
> performanceengine.
>
> > I was wondering when one repowers their Pantera with an engine that
> > generates allot more Tourque and Horsepower as well as possibly higher
> > revs
> > and you goal is higher top speed as well as faster acceleration do people
> > usually only change the pinion gear to change the final gear ratio or do
> > they also change the gears1st thru 5 or just one or some of them? From
> > looking at the calculator on the RBT transmission web sight, it seems
> like
> > you can accomplish the end result of raising your top speed available
> with
> > the higher horsepower of of a more powerfull engine. To get the optimum
> > gearing at every gear you could change the gears and the pinion gear but
> > the
> > cost would be very substanntial.The gear sets for 2nd, 3rd, 4th, and 5th
> > are $1068.75 apiece. That's $4275.00 for 2nd thru 5th ( plus labor) The
> > ring
> > and pinion set is $2801.25 (plus labor)  Thats $7076.25 just for parts to
> > change the gears and ring and pinion set. So my question is what have
> > other
> > people done when they made engine mods that produced large horsepower
> > increases and possibly increased revs acheive the desiredgearing to
> > provide
> > the right gear ratios to provide both reasonable accelleration as well as
> > top speed. (above the 168 mph limatation of the stock set up at 6800
> rpm).
> >
> > Boyd
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