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Chiptuning an Automatic or DSG Gearbox: What a Gearbox Tune Does

Key takeaways
  • An engine remap can push more torque through a gearbox than it was designed for.
  • A gearbox tune changes shift speed, clutch pressure and torque limits, and should match the engine tune.
  • Tuners quote different torque limits for each type of DSG, so find out which gearbox your car has.
  • Fluid changes matter even more once the car is tuned.


Most people think of chiptuning as an engine job. But if your car has an automatic or DSG gearbox, that gearbox has its own computer, and it has to cope with the extra power too.

What a gearbox tune changes

A gearbox remap, often called a TCU tune, adjusts how the gearbox behaves. Tuners say it can raise the torque limit, change shift speed and timing, increase clutch pressure so the clutches do not slip, and alter launch and gear selection. The result is meant to be a gearbox that suits the new engine settings.

Why it matters

If you tune only the engine, the extra torque can make the clutches slip and wear faster. The gearbox computer also has protective limits, so it may cut power or shift oddly. That is why the two tunes should be matched.

Know your gearbox

Tuning companies quote rough torque limits for the common Volkswagen group gearboxes: about 350 Nm for the DQ200 dry clutch, about 600 Nm for the DQ250, 550 to 600 Nm for the DQ381, and over 700 Nm for the DQ500. These are tuner figures, not independent tests, so treat them as a guide and ask a specialist about your exact car.

Keep it healthy

Heat and dirty fluid are the biggest enemies of a DSG. Change the gearbox fluid on schedule, or sooner if the car is tuned or tows, and avoid repeated hard launches. Tuners say a well looked after DSG can last well beyond 200,000 km.

Before you book

Ask the workshop whether they tune the gearbox as well as the engine, whether the two tunes are matched, and what guarantee they give. Check the effect on your warranty first, and keep a copy of the original software.

Source: Dyno Chiptuning Files.

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