Bowling's Optimum Shift Calculator

Input Parameters Are the Following:

Transmission Ratio One = 3.14 to 1
Transmission Ratio Two = 1.87 to 1
Transmission Ratio Three = 1.24 to 1
Transmission Ratio Four = 0.95 to 1
Horsepower = 62 at 3000 RPM
Horsepower = 90 at 4000 RPM
Horsepower = 100 at 4500 RPM
Horsepower = 110 at 5000 RPM
Horsepower = 120 at 5500 RPM
Horsepower = 125 at 6000 RPM
Horsepower = 130 at 6500 RPM
Horsepower = 125 at 7000 RPM
Horsepower = 122 at 7200 RPM

Computation Results:

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

Finding Best Shift Placement Points For Ratio 3.14 to 1.87: Error: Search outside range - need more RPM range in HP table! Finding Best Shift Placement Points For Ratio 1.87 to 1.24: Error: Search outside range - need more RPM range in HP table! Finding Best Shift Placement Points For Ratio 1.24 to 0.95: 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 3.14 to 1.87:

Found optimum shift RPM at 7194, which achieves maximum area under horsepower curve, and lowers the RPM to 4280 after shift

Finding Best Shift Placement Points For Ratio 1.87 to 1.24:

Found optimum shift RPM at 7200, which achieves maximum area under horsepower curve, and lowers the RPM to 4755 after shift

Finding Best Shift Placement Points For Ratio 1.24 to 0.95:

Found optimum shift RPM at 7197, which achieves maximum area under horsepower curve, and lowers the RPM to 5530 after shift

Bruce Bowling
bowling@cebaf.gov
Bowling Superior