Superb/Passat 6sp/7sp DSG

[donweather]

Can anyone enlighten me as to why both the Superb and Passat TDI's only come with a 6sp DSG whilst the Superb and Passat TSI's come with a 7sp DSG.

I would have thought the TDI's could run at exceptionally lower revs, hence the 7sp DSG would get even better fuel economy? Whereas the TSI's generally run at higher rev's.

[pologti18t]

Torque capacity of the respective gearboxes.

[Inego]

Maybe it's a torque management issue ie. 7sp doesn't handle the greater torque of the TDi? Or the more even torque spread of the TDi (across a narrower rev band) may be just as effectively managed by the 6sp

[donweather]

Thanks guys for the info on the DSG's. Greatly appreciated.

[dArK5HaD0w]

as the guys already mentioned, its to do with torque.
"both DSG gearboxes are application-specific. The 6-speed (DQ350) is paired with high torque engines (up to 350 Nm) while the 7-speed (DQ250) variant is more effective in combination with smaller engines and torque outputs of up to 250 Nm."
more here.

the 7spd dsg boxes found in audi's have a higher torque rating as they're a different dsg configuration.