Torque Converter Control Function
The Torque Converter Control function allows the electronic control of the torque converter lockup, as well as the ability to "dump" torque converter line pressure in order to control engine power in a drag racing application, as well as assisting the engine to "come up on the converter" to prepare for a standing start race.
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Wiring Tab
Options
Lock Enable
Enables the Lockup function. The Lockup function is used to lock the engine and transmission input shaft at the same RPM. This function improves fuel economy and avoids heat build up in the torque converter and automatic transmission oil from slipping at cruising highway speeds. Both vehicle speed sensors and a TPS are required to activate this function.
Dump Valve Enable
Enables the Dump Valve function. The Dump Valve function is used in drag racing applications to adjust the torque converter charge pressure during launch and racing conditions. Reducing the charge pressure at the start line will assist the engine to "come up on the converter" and achieve the desired launch pressure.
Torque Converter Multiplier Method
Torque converters are able to multiply the input torque value under certain conditions. This Method specifies how the Torque Converter Multiplier Value is provided to the ECU for calculations.
Lockup Feedback Mode
The torque converter Lockup Feedback Mode, whereby the ECU can monitor the status of the lockup.
Connections
Lock Request from ECU
Select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected as the Lock output.
Lockup Feedback
If feedback mode is set to Digital - Switched, select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected as the Lockup feedback.
Dump Valve Output
Select an available output wire, typically a DPO (Digital Pulsed Output) or Stepper Output that will be connected as the Dump Valve output.
Lockup Settings
In order to ensure the engine and transmission are in a position where the torque converter lockup will improve economy, the following parameters must be specified.
Minimum Road Speed
Specify a minimum road speed that must be achieved before Torque Converter control is enabled
Throttle Position
The maximum allowable throttle position before the Torque Converter is disabled
Minimum Coolant Temperature
The minimum coolant temperature that must be achieved before Torque Converter control is enabled. This is to ensure the engine is at a suitable operating condition to lock the torque converter.
Dump Valve Settings
Frequency
Frequency of the PWM signal to the Torque Converter Dump Valve.
Related Tuning Tables
Torque Converter Dump Duty Cycle
Under ECU Navigator>Torque Converter>select Torque Converter Dump Duty Cycle
In a drag racing application you may want to adjust the torque converter charge pressure during launch and racing conditions. Reducing the charge pressure at the start line will assist the engine to "come up on the converter" and get to the desired launch pressure. You may then decide to introduce full charge pressure at the start of the race, or re-introduce the charge pressure during the run. There are several channels you could map this against, typically Race time, Engine RPM or Road Speed would be used.