COMPUSHIFT Mini Manual – COMPUSHIFT Mini Manual
Tuning and Driving
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At higher speeds and lower loads, the torque converter isn't needed, so the clutch should be locked to
improve efficiency.
The torque converter helps absorb shift shock, so the torque converter clutch should be unlocked during
shifting.
The torque converter clutch shouldn't lock too soon after a shift completes.
The torque converter clutch should only be locked in certain gears, for example 3rd and 4th.
The parameters below take these factors into account and allow you to tune for your engine and vehicle.
The drawing below illustrates the relationship between throttle, speed, and the torque converter clutch control
parameters.
3.4.2 Torque Converter Clutch Enable Gear
LK GEAR
This parameter selects the first gear for which torque converter clutch lock is permitted. The allowed choices are
second, third and fourth. The table below summarizes the settings.
Setting
Lock Allowed
2
2nd, 3rd, 4th gear
3
2nd, 3rd, 4th gear
4
2nd, 3rd, 4th gear
Note that the torque converter clutch will usually stay locked during upshifts and will unlock during downshifts.