Gearbox / TCU Remapping

The TCU controls the automatic gearboxes functionality, e.g torque limits and gear shifts. The TCU works in harmony with the ECU (Engine Control Unit) by sending and receiving real time data across the vehicles network system. When tuning an engine, we often recommend tuning the gearbox simultaneously. This will help fully optimize the performance and driveability of the vehicle.

The number of parameters that can be changed is dependant on the application, however here are some of the typical changes:

  • Shift Speeds – Increasing the speed in which the gearbox changes gear.
  • Torque Limiters – Increasing the TCU torque limiters ensures the transmission cannot limit the performance of the engine.
  • Hydraulic Pressure – Increasing the hydraulic pressure can increase clutch clamping pressure to prevent clutch slip on highly tuned vehicles.
  • Shift Points – Changing the rpm limiter of the engine is often not possible without modifying the TCU software.

    Some TCU’s have a higher level of manipulation available and advanced options like the following can be activated: Launch Control, Full Manual Mode, Kickdown Delete. Please note: Not all TCU’s will ‘need’ to be tuned and not all TCU’s can be tuned, it depends on the application and the desired vehicle performance.

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