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based on engine flywheel horsepower and vehicle weight. The program can be used to see what
effect changes in the vehicle weight or available horsepower will have on elapsed time and MPH.
Press ALT, DRAG PERF., then select Est. ET/MPH to start this program.
Display Example:
== Est. ET/MPH ==
Est. HP? 405 (Estimated flywheel HP)
Weight? 3250 (Enter vehicle starting line weight in pounds)
1/8mi ET= 7.405 (Estimated 1/8 mile ET)
1/8mi MPH= 95.84 (Estimated 1/8 mile MPH)
1/4mi ET= 11.662 (Estimated 1/4 mile ET)
1/4mi MPH= 116.88 (Estimated 1/4 mile MPH)
Gear Ratio, Circle.
This program will assist in selecting the proper final drive gear ratio based on the old engine
RPM, the old tire circumference, the old gear ratio, the new engine rpm, and the new tire
circumference.
Press CIR.TRK. FORMULAS, then Gearing/Tires, then select Gear Ratio to start this program.
Display Example:
== Gear Ratio ==
Old RPM? 7250 (Engine RPM was)
Old Tire? 89.00 (Tire circumference was inches - not diameter)
Old Gear? 5.13 (Final drive gear ratio was)
New RPM? 7500 (Desired engine RPM)
New Tire? 89.00 (Desired tire circumference inches - not diameter)
New Gear= 5.31 (Calculated gear ratio to use)
Engine RPM, Circle.
This program will calculate a new peak engine RPM based on the old engine rpm, the old tire
circumference, the old gear ratio, the new tire circumference, and the new gear ratio.
Press CIR.TRK. FORMULAS, then Gearing/Tires, then select Engine RPM to start this
program.
Display Example:
== Engine RPM ==
Old RPM? 7250 (Engine RPM was)
Old Tire? 89.00 (Tire circumference was inches - not diameter)
Old Gear? 5.13 (Final drive gear ratio was)
New Tire? 89.00 (Desired tire circumference inches - not diameter)
New Gear? 5.31 (Desired gear ratio)
New RPM= 7504 (Calculated engine RPM for this combination)
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