DSG. Automatic and manual modes

transmission or double-clutch transmission), is a type of automatic transmission or automated automotive transmission. It uses two separate clutches for odd and even gear sets. It can fundamentally be described as two separate manual transmissions (with their respective clutches) contained within one housing, and working as one unit.

mode, and many also have the ability to allow the driver to manually shift gears in semi-automatic mode, albeit still carried out by the transmission's electro-hydraulics.

wet multi-plate clutches, bathed in oil (for cooling)—or two dry single-plate clutches. The wet clutch design is generally used for higher torque engines that can generate 350 newton metres and more (the wet multi-plate clutch in the Bugatti Veyron is designed to cope with 1,250 N·m, whereas the dry clutch design is generally suitable for smaller vehicles with lower torque outputs up to 250 N·m However, while the dry clutch variants may be limited in torque compared to their wet clutch counterparts, the dry clutch variants offer an increase in fuel efficiency, due to the lack of pumping losses of the transmission fluid in the clutch housing.