Shift feel
Gear changes can be made firmer and shorter, or smoother, where that gearbox software allows it. It is set for how you drive. Launch or a sharper kickdown is included only where that software already has it. It is not promised on every DSG or ZF.
With an engine remap
After a Stage 1 or Stage 2, some gearboxes still change up too early or limit torque. The gearbox file lets the box use what the engine is now producing. Sometimes the standard gearbox map is still the safer choice. We say which before you pay.
Speed limiter in the gearbox
Some cars limit top speed in the engine, some in the gearbox, and some in both. We check which one it is, so you are not charged twice. Tell your insurer. A limiter the law requires on that vehicle is not removed.
Rev limit in the gearbox
Some autos also cut revs in the gearbox computer. It is raised only where the engine and the gearbox can take it. Refused on a tired or standard box that cannot.
TCU / gearbox module
A factory update, or programming a gearbox computer after a replacement, is not a tune. That lives on programming and cloning.
Learn / adaptations
After a repair, some boxes need a learn procedure. That is diagnostics, not a performance map.
Can it be put back to standard?
Sometimes. It depends on the gearbox. On some units the original file can be written back. On others it cannot, or the gearbox will not drive as it did before. Keeping a copy of the original file is not a promise that the unit will accept it again. Where the vehicle shows that, we say so before anything is written. If the car has to return to standard later, tell us before the visit.