Twin Clutch SST

Twin Clutch SST (Sport- or Sportronic Shift Transmission) is the brand name of a six-speed dual clutch transmission developed by Getrag for Mitsubishi Motors. The system was first incorporated in the 2007 Lancer Evolution X, and was designed to be a more performance-oriented system than that developed by rival manufacturers, with shorter gear ratios optimized for acceleration.

Operation

TC-SST uses dual clutches to change gears. The TC-SST completes the clutch and gear shifts more quickly than a driver could in a conventional manual transmission, and is also quicker than either an automatic transmission with a torque converter, or a single clutch automated manual transmission. The system's high-efficiency power transmission mechanism is on par with a normal manual gearbox, while allowing quicker gear shifting with no drop-off in engine power, thus offering greater performance and better fuel economy. The system can be operated by both a console-mounted shifter, and magnesium steering wheel paddle shifters; and offers semi-manual and fully automatic modes. TC-SST also works in conjunction with Mitsubishi's S-AWC system.