Dynojet WinPEP 7 - Manual (Page 63)

M A K I N G A R U N
Making a Run—Negative Horsepower
Version 2 WinPEP 7 User Guide
4-9
N EGATIVE H ORSEPOWER T EST —D IFFERENT B RANDS OF O IL
Different brands of oil can be tested using negative horsepower.
1
Warm engine and oil.
2 Perform a roll-on test using the first brand of oil.
3 At redline, turn the ignition key off but leave the throttle wide open.
4 Let the vehicle coast to about 30 m.p.h. and press the green sample button.
5 When the drums stop rotating, press the green sample button again.
6 Change the oil and repeat the test above.
Compare the two graphs together. With negative horsepower enabled, look at the
values below zero. These values will indicate which brand of oil has less friction.