Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Transmission Control Users Manual - Manual (Page 14)

Bigstuff3 GEN3 Transmission Control Manual
As you will notice, there are only two windows in the Torque Converter Clutch (TCC) table. This is
because the converter is only allowed to “Lock-up” in third and fourth gear (with a four speed
transmission) and fourth and fifth gear (with a five speed transmission).
The “Active” window identification and the method for changing lock and unlock points, is the same
as was outlined in the
Shift_Tables section above.
The TCC table is used to configure when the torque converter locks and unlocks in third and fourth
gear (with a 4 speed transmission) as a function of vehicle speed (MPH) and percent (%) throttle
opening. The
green line in the windows above represents the points when the torque converter begins
to lockup, based on settings in the Torque_Converter_Control section of the Transmission
Configuration table. The red line represents the points when the torque converter unlocks. The area
between the red and green lines is the hysterisis needed to keep the transmission from continually
locking and unlocking.
The “Active” window will move up or down within the TCC Table depending on which gear the
transmission is operating in. The “Active” window will always be larger than the other windows. The
X axis (Throttle Position) & Y axis (Vehicle Speed in MPH) parameters will be will be displayed as
the “Active” window as it moves from gear to gear.
When the ECU is powered and the wheels are moving, an ellipse will appear in the “active” window
representing the current vehicle speed and throttle position. When the ellipse moves above the
green
line, the torque converter begins to lock, and when the ellipse moves below the red line the torque
converter will unlock.
The ECU does not allow the converter to remain locked during a gear shift.
Changing Lock and Unlock Points Using the Computer Mouse and Arrow Keys
Using the Mouse
To change torque converter lock and unlock values, place the mouse arrow on the box along any green
or red line, depress and hold the left mouse button, and move the box up or down. Once the left mouse
button is released the new lock or unlock point (MPH) will be displayed in yellow numbers. The MPH
value for any lock or unlock point in the table can also be reviewed by left mouse clicking on any
“TCC” box.
Using the Arrow Keys
Lock and unlock point changes can also be made using the keyboard arrow keys, in “Edit Mode”. To
enter “Edit Mode”, hit the “SHIFT” key on the computer keyboard. The background of the entire
“TCC” Table will turn blue and “Edit Mode” will appear in the gear position box (see screen print
below). The “SHIFT” key may need to be hit twice to enter “Edit Mode”, depending on the PC
(operating system) being used.
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