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Discussion Starter · #1 ·
I am looking for a formula that can be used to calculate mph through rpm, gear ratios, and tire size. Any help is greatly appreciated.
 

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The formula is:
Engine RPM = (MPH X Rear Gear Ratio X 336 X Trans Gear Ratio) / (Tire Dia inches X Torque Conv Efficiency)

Torque Conv Efficiency = 1 for manual clutch or lock up torque conv or about .95 for non lock up stock torque conv
 
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