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[VAG DQ250 Direct-Shift Gearbox (DSG) transmission diagram and exploded view.]
Dual-Clutch Automatic Transmission / Direct-Shift Gearbox (DSG)
Found in various Volkswagen/Audi models (also becoming popular with other import/domestic manufacturers) the dual-clutch "automatic" transmission or direct-shift gearbox (DSG) is in fact automatic in the sense it shifts automatically however in design and function it is nothing like a conventional automatic transmission. A conventional automatic transmission uses planetary gearsets and hydraulics yet a DSG transmission actually uses similar principles of a manual transmission, only doubled. There are two input shafts, two output shafts and two independent clutch packs. Clutch packs are used to transfer the engines torque to the gearbox instead of a torque converter. The transmission control module (TCU) determines the correct gear to engage while at the same time predetermines the next gear that should be used preselecting it on the opposing output shaft. This allows for quicker and smoother shifts than a conventional automatic or manual transmission. With all this technology comes the need for regular maintenance including fluid and filter exchanges requiring specific tools and equipment. We recommend replacing the fluid and filter in your VAG DSG transmission every 40k miles. Along with regularly scheduled maintenance we offer diagnostics, repair and performance upgrades for the VAG DQ250 DSG/S-Tronic transmission including performance software and aftermarket upgraded clutch packs for high torque applications.