Bowling's Optimum Shift Calculator

Input Parameters Are the Following:

Transmission Ratio One = 3.37 to 1
Transmission Ratio Two = 1.99 to 1
Transmission Ratio Three = 1.33 to 1
Transmission Ratio Four = 1.00 to 1
Horsepower = 95 at 2000 RPM
Horsepower = 150 at 3000 RPM
Horsepower = 180 at 3500 RPM
Horsepower = 220 at 4000 RPM
Horsepower = 250 at 4500 RPM
Horsepower = 280 at 5000 RPM
Horsepower = 290 at 5500 RPM
Horsepower = 306 at 6000 RPM
Horsepower = 290 at 6500 RPM

Computation Results:

Using the Criterion for Maintaining the Same Horsepower Before and After Shift:

Finding Best Shift Placement Points For Ratio 3.37 to 1.99: Error: Search outside range - need more RPM range in HP table! Finding Best Shift Placement Points For Ratio 1.99 to 1.33: Error: Search outside range - need more RPM range in HP table! Finding Best Shift Placement Points For Ratio 1.33 to 1.00: Error: Search outside range - need more RPM range in HP table!

Maximumizing the Area Under the Horsepower Curve:

Finding Best Shift Placement Points For Ratio 3.37 to 1.99:

Found optimum shift RPM at 6494, which achieves maximum area under horsepower curve, and lowers the RPM to 3835 after shift

Finding Best Shift Placement Points For Ratio 1.99 to 1.33:

Found optimum shift RPM at 6494, which achieves maximum area under horsepower curve, and lowers the RPM to 4340 after shift

Finding Best Shift Placement Points For Ratio 1.33 to 1.00:

Found optimum shift RPM at 6497, which achieves maximum area under horsepower curve, and lowers the RPM to 4885 after shift

Bruce Bowling
bowling@cebaf.gov
Bowling Superior