Keith
This is all based on 8600 RPM.
1) Run the 3.25 gear with 28" tire in 5th for 221 MPH in D/GALT. Pop it into
6th to run 242 MPH with nitrous for D/FALT.
2) Now with a 27" tire, run a 3.07 gear in 5th for 225 MPH jaunt, and in 6th
for a 248 MPH blast.
3) Also with a 26" tire, run a 3.0 gear for 223MPH, and in 6th for a 245 MPH
pull through the lights.
This is all assuming you got the chutzpah to pull the gear.
Guess I'd go with number 2, as I think those are your M/T tires.
JB
----- Original Message -----
From: "Keith Turk" <kturk@ala.net>
To: "William T Smith" <WmTSmith@landracing.com>
Cc: <land-speed@autox.team.net>
Sent: Sunday, June 24, 2001 8:39 PM
Subject: Re: Gear selection challange
> Good question Bill..... the current answer is that the Peak Torque is the
> same as the Peak HP.... right around 8300 rpm..... and the motor freely
> spins above that number.... drops off about 35hp at 8700 rpm....
>
> Were going back in the morning to work on the peak torque number.... it's
> not real impressive right now.....
>
> K
> ----- Original Message -----
> From: "William T Smith" <WmTSmith@landracing.com>
> To: "Keith Turk" <kturk@ala.net>
> Cc: <land-speed@autox.team.net>
> Sent: Sunday, June 24, 2001 7:25 PM
> Subject: Re: Gear selection challange
>
>
> > 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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