Shift Quality

[Power Hungry]

On the power reduction, many folks complain about the "dive" when the truck shifts and prefer to have the torque reduction removed. On some performance programs, we eliminate the torque reduction, but on tow programs we don't... for obvious reasons.

As for the Shift Slope and Offset, here's how it works:

The PCM calculates a specific amount of torque output based on the calculated torque table. Let's say this is 372 Ft./Lbs for a given Throttle Position and Exhaust Backpressure.

You multiply the torque by the slope for that particular gear to generate a Line Pressure PSI value. Using your towing (1st program) example above and assmuing 2nd gear...

372 * 0.1719 = 64 (63.9468) PSI

Then you add the offset...

64 PSI + 0 PSI = 64 PSI

64 PSI is what the PCM will set the EPC regulator to for main line pressure in that particular gear.

Make sense now?