|The 7-speed DSG offers improved fuel consumption and lower GHG emissions compared to other transmission options—even besting the manual. Click to enlarge. Source: VW|
The new Volkswagen 7-speed DSG automatic transmission (earlier post) is now available in selected countries in the Golf and Golf Plus with the 1.4 TSI and 1.9 TDI engines. In the new 7-speed, the lower gears are more closely spaced, improving in-gear acceleration to aid in overtaking maneuvers, while the higher gears are lengthened to reduce loading on the engine and maximize economy.
The new 7-speed automatic transmission is the first DSG for front-traverse installation. It is also the first with a dry sump. This not only saves considerable weight and improves the efficiency of the system but also makes the new gearbox more compact. The maximum torque that can be transmitted is up to 250 Nm.
The new unit will initially start series production in the Golf and Golf Plus, and is available for the 1.4 TSI engine (90 kW), previously only available with a manual gearbox, and for the 1.9 TDI engine (77 kW).
As with the six-speed DSG gearbox, of which more than one million have been produced since launch, the new seven-speed system features a hill-hold function to aid starts when the vehicle is on an incline.
Fuel consumption figures for the Golf / Golf Plus 1.9 TDI with the 7-speed DSG are 0.7 liters per 100 km lower than they are with the 6-speed DSG. In the Golf hatchback, compared with the six-speed manual version, the new seven-speed DSG brings a 10 g/km CO2 saving (down from 149 g/km in the manual to 139) and a fuel consumption improvement of 0.4 liters per 100 km (from a combined 6.3 l/100km for the manual to 5.9 l/100km for the 7-speed DSG—about 40 mpg US).
Electrification of Powertrain Systems Hybrids and more (VW at Challenge Bibendum 2007)