Description
Vehicles with automatic transmissions are typically equipped with a Transmission Control Unit (TCU), which manages all aspects of the transmission’s operation, such as gear shifts and torque limitations. The TCU communicates seamlessly with the Engine Control Unit (ECU) by exchanging real-time data across the vehicle’s network system. For optimal performance and drivability, it is often recommended to remap both the ECU and TCU simultaneously. This ensures that the two control units remain perfectly synchronized and continue to operate in harmony.
The number of parameters that can be changed is dependant on the application, however here are some of the typical changes:
- Shift Speeds – Enhances the speed at which the gearbox transitions between gears.
- Torque Limiters – Raising the TCU’s torque limits prevents the transmission from restricting the engine’s performance.
- Hydraulic Pressure – Boosting hydraulic pressure increases clutch clamping force, reducing the risk of clutch slippage in highly tuned vehicles.
- Shift Points – Adjusting the engine’s RPM limiter often requires modifications to the TCU software
This can be applied to only BMW gearboxes and VAG gearboxes.
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