[DeTomaso] optimum ZF ratios

[boyd casey]

I realized eary that even an increase to a 800 hp engine you would be
limited to 168 mph at e red line of 6800 rpm with the stock gearing. So you
may get from 0 to 60 allot quicker but you won't do anything to raise your
top speed unless you change the ring and pinion ratio.  You need to
calculate you gear ratios as well as your final drive ratio and take your
horespower as well as your torque to come up with the right combination that
will give you acceleration as well as top speed.  I wonder if there is a
software application that uses torque , horsepower, RPM's wheel sizes to
give you an idea of what you can expect. It could be a very expensive
experiment to try to match you engine and gear ratio's as well as ring and
pinion  to come up with the right combination. You could wind up with a 800
hp dog or a car with a 0 to 100 time of 5 sec's and a top speed of 140 mph.
Or a car geared to do 250 mph that won't reach it do to the laws of physics
and be a dog in 0 to 60 or 1/4 mile times.
Boyd

On Tue, Jan 12, 2010 at 6:57 PM, Asa Jay Laughton <asajay at asajay.com> wrote:

> THAT is Cool!
>
> I pulled up the photo of my ZF data plate here:
>
> http://www.teampanteraracing.com/index.php?option=com_g2bridge&view=gallery&Itemid=57&g2_itemId=2158&g2_imageViewsIndex=1
>
> Then compared the values on RBT's site.  Then I played with it a
> little  Right now I can expect to top out at about 130 MPH.  That
> means if I want to go faster (and who doesn't) I need to do some work,
> either increase top end RPM reliably, change tire size diameter or put
> a lower gear set in.
>
> Fantastic.  I can see that link making it on the TPR site.  ;)
>
> Asa Jay
>
> Quoting boyd casey <boyd411 at gmail.com>:
>
> > RBT has a gear ratio calculator on their web sight. It shows all the
> > availible gear ratios for every gear as well as the final ring and pinion
> > gear ratios. It shows the speed at shift points and the rpm drop per gear
> > shift. Go to http://www.rbttrans.com/gear_ratios.html
> >
> > Boyd
> >
> >
> > On Tue, Jan 12, 2010 at 2:24 PM, <jderyke at aol.com> wrote:
> >
> >> In a message dated 1/11/10 6:40:41 PM, dgordon100 at cox.net writes:
> >>
> >> > If buying a new ZF from RBT, what would be the optimal ratios for each
> >> > gear and final drive given a max torque of approx 600+ ft/lbs at 4250
> and
> >> max
> >> > horsepower of approximately 700 horsepower at 6500 rpm both measured
> at
> >> > the wheels? I would thin(k) that after each gear change it would be
> >> desirable
> >> > to not drop below the peak torque rpm providing I shift at 6500 rpm.
> >> >
> >> If you're gonna gear it like you'll always be racing for money, the ZF
> will
> >> likely hold together but production engines will get used up pretty
> fast.
> >> My suggestion- phone or fax Lloyd Butfoy and ask the expert's opinion.
> He
> >> has
> >> many possible ZF combinations- including a 6-speed- but you need to
> discuss
> >> them- and their costs. My 2¢- J DeRyke
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