Bowling's Optimum Shift Calculator

Input Parameters Are the Following:

Transmission Ratio One = 2.66 to 1
Transmission Ratio Two = 1.78 to 1
Transmission Ratio Three = 1.30 to 1
Transmission Ratio Four = 1.00 to 1
Horsepower = 140 at 2600 RPM
Horsepower = 167 at 3000 RPM
Horsepower = 200 at 3500 RPM
Horsepower = 235 at 4000 RPM
Horsepower = 263 at 4500 RPM
Horsepower = 285 at 5000 RPM
Horsepower = 295 at 5500 RPM
Horsepower = 280 at 6000 RPM

Computation Results:

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

Finding Best Shift Placement Points For Ratio 2.66 to 1.78: Error: Search outside range - need more RPM range in HP table! Finding Best Shift Placement Points For Ratio 1.78 to 1.30: Error: Search outside range - need more RPM range in HP table! Finding Best Shift Placement Points For Ratio 1.30 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 2.66 to 1.78:

Found optimum shift RPM at 6000, which achieves maximum area under horsepower curve, and lowers the RPM to 4015 after shift

Finding Best Shift Placement Points For Ratio 1.78 to 1.30:

Found optimum shift RPM at 5997, which achieves maximum area under horsepower curve, and lowers the RPM to 4380 after shift

Finding Best Shift Placement Points For Ratio 1.30 to 1.00:

Found optimum shift RPM at 5999, which achieves maximum area under horsepower curve, and lowers the RPM to 4615 after shift

Bruce Bowling
bowling@cebaf.gov
Bowling Superior