There are 2 sets of torque limiters, lets not get these confused, so we will call them set 1&2
Set 1 are part of the ENGINE ECU
Set 2 are part of the GEARBOX ECU
As part of tuning the engine ECU the in-gear torque limiters (which can easily be missed, I have done this twice on a certain software version) must be raised. If not then at STG2+ the engine feels flat as the torque hits the limiter and flatlines. This does not happen with most maps, all Revo and APR maps will have these parameters corrected in the map and the dealers do not alter them.
There is a software version (vag number ends in 115L if you look at engine ECU id in vagcom) where the torque limiters are always at a different map address, and quite easily missed.