In addition to offering the S tronic gearbox on selected gasoline and diesel versions of the all-new 2009 Audi Q5 compact SUV, which hits European dealers in the fourth quarter of this year, Audi is dropping it into the European-spec 2009 Audi S5 as a replacement for the coupe’s optional six-speed automatic transmission.
Although this S tronic gearbox is being marketed under the same name as the Borg-Warner-developed, six-speed twin-clutch transmission (previously known as the Direct Shift Gearbox, or DSG) in the U.S.-spec Audi A3 and Audi TT, it’s a completely different unit. Parent company Volkswagen AG engineered it in-house and it will be built at VW’s factory in Kassell, Germany. Cooling is significantly improved on the new S tronic, thanks to a vacuum booster that effectively doubles the amount of oil available to lubricate the twin clutches, and this helps the transmission cope with higher engine torque loads — up to 406 pound-feet (550 Nm), says Audi. The older S tronic transmission tops at 258 lb-ft (350 Nm). Moreover, because the clutches and oil pump are oiled separately from the gearsets and differentials, this S tronic gearbox can be more easily packaged with the longitudinal engine layouts used in most Audis, including the new Q5 and the A4, A5, A6 and A8 families.
Source: Inside Line