May 25, 2007 Volkswagen has developed a seven-speed version of its DSG gearbox which is used on such exotica as the Bugatti Veyron and the Audi TT. The new seven-speed gearbox, codenamed DQ200, uses a pair of dry clutches in preference to the six-speed version’s twin wet clutches, increasing efficiency and performance over the wet clutch six-speed system. The six-speed DSG gearbox, which was introduced in 2003, uses a pair of clutches submerged in oil. The new seven-speed gearbox adopts a pair of dry, organic bonded friction linings that do not require cooling, making the drivetrain more efficient through the extra ratio and the fact that less power is required for the gear selection and clutch servo system.
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