Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Transmission Control Users Manual - Manual (Page 10)

Bigstuff3 GEN3 Transmission Control Manual
The steps required to configure the GEN3 ECU to the transmission are described in the following
paragraphs.
Gearbox Type
Select the appropriate transmission type. The GM 4L60E or 4L80E transmissions are the currently
available transmission options. Select the transmission type installed in the vehicle.
Gears
Select the number of gears for the transmission being used. The 4L60E and 4L80E both are 4 speed
transmissions, so select “4 speed”
Torque Converter Control
The converter solenoid locks the torque converter, which prevents transmission slippage and allows the
input shaft to apply a 1-to-1 ratio with the given gear.
• TCC Rate (Torque Converter Clutch) Rate: TCC Rate is the rate at which the torque
converter lockup is applied. The larger the number inputted, the quicker the converter clutch
will be “locked”. A number like 255 will lock the converter very quickly. A number like 128
will lock the converter at a much slower rate. It is better to start with a lower value, gradually
increasing the number until the desired clutch lock rate is achieved.
• TCC Delay (sec) (Torque Converter Clutch) Delay: TCC Delay is the time between when the
criteria below are met and when the torque converter begins to lockup.
o Delay Criteria
ƒ Minimum throttle position (for idle) is exceeded by the TPS%.
• Note: the torque converter is unlocked if the throttle is closed.
ƒ Vehicle Speed – Vehicle speed has to exceed the value set (via the green line) in
the TCC table, described later in this manual.
ƒ Transmission Fluid Temperature – This variable is “hard coded” at the factory.
When the above criteria are met, the torque converter clutch begins to lockup. The lockup starts at a
30% duty cycle and is completed at 80% duty cycle. The rate at which the converter goes from 30%
duty cycle to 80% duty cycle is determined by the
TCC_Rate described above.
Line Pressure
• Reverse Gear Modifier – The value inputted into this cell is used by the ECU to eliminate the
drive line clunking that can occur when the transmission is put into reverse. The ECU reduces
the line pressure by the value in the cell, as a percent of total line pressure. In the table above,
the value used is -20%, which the ECU will use to reduce the total available line pressure by
20%, when the transmission is put into reverse.
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