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Skoda's twin-clutch gearbox

This gearbox or dual clutch transmission (DCT) is a semi-automatic transmission with separate clutches for odd and even gears. The outer clutch drives gears 1, 3, and 5 (and reverse). The inner clutch drives gears 2, 4, and 6. Shifts can be accomplished without interrupting power, by applying the engine's torque to one clutch just as the engine's torque is being disconnected from the other clutch. Since the synchronizers that select an odd gear can be moved while driving the car in an even gear, and vice versa, DCT's have been configured which shift faster than Formula One cars and other single-clutch AMT's (automated-manual transmissions, a.k.a. single-clutch semi-automatics); the shift can also be made smoother and more suitable for street-driving than a single-clutch AMT is capable of. A twin-clutch gearbox eliminates the torque converter, which is a major source of parasitic loss in a traditional automatic transmission. However, dual clutch transmissions that are currently on the market use wet multi-plate clutches, similar to the clutches used in traditional automatic transmissions. Versions that use dry clutches, like those usually associated with manual transmissions, are rumored to be in development by several manufacturers.

This type of gearbox was invented by Andolphe Kégresse just before the outbreak of World War II, but he never developed a working model. The first actual DCT's came along in the 1980's when computers to control the shifts were compact enough.
DCT's are currently sold mostly by Volkswagen Group under the brand names DSG Direct-Shift Gearbox (for Volkswagen, SEAT and Škoda) and S-Tronic (for Audi). Volkswagen produces a DCT transmission (model DQ250) under license from Borg-Warner for use in east-west powertrain installations, and this is used in a variety of Skoda's.

UK-based Ricardo Company produces the seven-speed DCT for the 1001-horsepower Bugatti Veyron 16.4, another Volkswagen Group product. Cima produces the seven-speed DCT for the Koenigsegg CCX.
Getrag has a working seven-speed DCT transaxle for mid-engine longitudinal applications, capable of taking more than 750 newton-meters, which Getrag calls the 7DCL750. It is "in development" with a release expected by early 2007. A renewed version of the PDK (Porsche Doppelkupplungen), but for mass-production instead of race cars, was expected in January 2006 but comes in 2007 or later.

It is also rumored that the 2008 BMW M3 will feature a dual-clutch SMG when it is released in the US.
Additionally, Mitsubishi has announced that the 2008 Mitsubishi Lancer Evolution X will come with a dual clutch transmission controlled by magnesium paddle shifters (with a five-speed option as well).

BorgWarner is the current leading supplier of wet clutches and hydraulic modules for these transmissions. BorgWarner, who call their technology "DualTronic", signed further agreements with two other (unnamed) European automotive manufacturers to incorporate their components in DCTs.

Some of Škoda's car timeline.
Fabia, Roomster, Octavia, Superb, Joyster, Yeti, Tudor, Ahoj, Felicia, Favorit