KT,
What RPM peak Torque and how much
how much peak Torque at max power
With these two and your trans and RA ratios we can get
this done and I bet it will not be in OD and I am just
guessing ! wmts
Quoting Keith Turk <kturk@ala.net>:
> Thought I would share the joy's of running a 9" Vs a
quick change....
>
> I have been waiting on a dyno sheet to start
selecting the right gear for
> speedweek..... keep in mind I have the axle's out and
the Driveshaft out so
> it's an easy time to swap them out.
>
> The motor makes it Peak power at 8300rpm ( correction
from previous post )
> So we are looking to spin it around 8600rpm or so....
>
> we have 3.25 gears as well as 3.07's..... and three
sets of tires ranging
> from 26" .... 27".... and 28"
>
> There are Two ways to play this game mathmatically...
both of which are
> accurate and can cross check each other.....
>
> 1. Finding MPH
>
> Rpm X tire height in Inches divided by 336...
divided by the gear...
>
> for example.... 8500rpm X 26" = 221000 divided by 336
= 657.73 divided by
> 3.25 = 202mph then we could pitch the Overdrive
into the fray by dividing
> that 202mph by the .91 OD which would give us an
output speed of 222.393
> mph...... this just happens to be 3mph faster then
the current record in
> the
> class.
>
> 2. Finding Rpm
>
> MPH X Gear ratio X 336 divided by tire hieght in
inches
>
> for example.... 225mph X 3.25 X 336 = 245700 divided
by 26" tire = 9450
> rpm
> Obviously a bit much till we X it by the OD of .91
which is 9450 X .91 =
> 8599.5 rpm
>
> So that gets you through the Gas record..... we want
to consider the Fuel
> record as well.... as that is where are best chances
are with a Motor
> designed to run on Nitrous Oxide. the record is
230mph in that class...
>
> Here is the challange ... come up with the best
combinations and the
> reason's why..... I think I have already decided how
we are going to do it
> and Beleive it or not the example I just gave isn't
the best combination in
> my Humble opinion..... thou it's not a bad choice....
it just might not be
> the BEST choice as there are other things to
consider .... such as Drag
> associated with running in OD and the Tire size/
wheel bearing speed.
>
> I'll Give fella that comes up with the best choice a
So-Al T-shirt...
>
> Keith
>
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