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

[Mad Dog Antenucci]

I hear ya Boyd. A well built Cleveland stroker (thank you Russ!) will take a beating if you can keep the block together. The beauty of the taller gears is what gets you to 170 mph at 6800-7000 with stock gears is now closer to 6,000 R's and with a good 2-pass race radiator like Qualla and others offer, an oil cooler you can run any endurance or open road race in the country...not once but several times.  

 
Mad Dawg Antenucci 
Team Pantera Racing 
The 1st & still the only vintage race team in open road racing 
www.teampanteraracing.com




________________________________
From: boyd casey <boyd411 at gmail.com>
To: Mad Dog Antenucci <teampantera at yahoo.com>
Cc: Will Demelo <wdemelo at cogeco.ca>; detomaso at realbig.com
Sent: Fri, March 12, 2010 7:48:41 PM
Subject: Re: [DeTomaso] Question about modifying ZF gearing for high  performanceengine.


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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