Page 65 - Big End Performance 2014
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PERF=ORMANCE PROOUCTS
Choose The Gear Ratio That Is Best For Your Vehicle
When selecting a Gear Ratio, you should consider the following:
1. Tire Size
2. Transmission Ratio
3. Final Gear Ratio
4. Engine RPM at Cruise Speed
The following formula has been developed to calculate the optimum final Gear Ratio to suit your application. M.P.H X Gear Ratio
TireDiameter X 336=rpm._________
The chart shown below shows RPM catculalions at 55 MPH for various combinations of final Gear Ratio
and Tire Diameter.
According to this chart, the acceptable RPM range is 2000-3000 which Is represented by the entire shaded area of the chart. The optimum RPM range Is 2300-2600, and it is represented by the white area between the two red areas. When changing ratios to Improve mi/Nge, choose a ratio within the red shaded band above the optimum range. When changing ratios to Improve power, choose a ratio within the red shaded band below the optimum range.
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