Dick, that "constant" also likely has
to do with the tach you are currently using.
Joe :)
Dick J wrote:
> Maybe everybody already does this, but if not, it
> is a little trick you might want to use. I have
> a plastic covered chart that I carry on the front
> seat of the Camaro when I race. It has my tire
> size options,(one side for my short tires, and
> the other side for my tall tires) and then a
> breakdown of speed determined by RPM in 500 RPM
> and 100 RPM increments grouped around my pre-set
> red line. There are about ten speeds listed per
> side in order to allow quick reference. I have
> it printed in GIANT font so that I can read it at
> a quick glance. Needless to say, I know my RPM
> through the clocks (pretty close, anyway). As
> soon as I get to the turnoff, I check the chart
> real quick to see approximately how fast I went.
> After about fifteen runs, I have added a constant
> into the standard formula. I have determined
> that multiplying the ideal final speed by .957
> will allow for both tire stretch and the slippage
> in my TurboHydro 400 transmission and will give a
> more accurate result for my car. That formula
> modification is for Maxton only. I will have to
> use a different constant for Bonneville, but
> should be able to figure out what it is after one
> or two runs.
>
> This chart is just to satisfy my curiosity, and
> to keep me from going crazy while waiting for my
> push truck and crew to get to me to let me know
> what I actually ran. As you all know, waiting on
> them can be the longest five minutes in the
> world.
>
> Dick J
> In East Texas
> NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.
> http://geocities.yahoo.com/ps/info1
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