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If you change an input and press "Calculate!" a second time without clearing an existing results sheet, a second results sheet will be added to this side of the page immediately below the original. By using 1:1 as a transmission ratio & your peak RPM as the engine speed you can find your jackshaft RPM for any given speed. Then you can calculate your clutch ratio for that speed by dividing the engine peak RPM by the RPM shown in the resulting chart for that speed. Example: Tire Diameter = 18" Axle Ratio = 3.27 Engine RPM = 8000 RPM First Gear = 1 And you know you achieved 105 MPH at the end of a straight... find the RPM in the chart that would come closest to equaling 105 MPH, that would be your jackshaft speed.
Your clutches then would have shifted out to a ratio of 1.25:1 If you came off a corner at 50 MPH & your engine hit 7300 RPM when you got back in the gas... Tire Diameter = 18" Axle Ratio = 3.27 Engine RPM = 7300 RPM First Gear = 1
So your clutches backshifted to 2.39:1 as you went through the corner. (If you come off corners at 7300 RPM you might want to think about working on getting more backshift out of your clutch setup. And unless you are actually getting up to 1:1 on your clutches elsewhere, a lower gear might not be a bad idea either.  ) |