Twin Clutch SST
twin-clutch transmission developed by Mitsubishi
Twin Clutch SST (Sport- or Sportronic Shift Transmission) is the brand name of a six-speed dual-clutch automatic transmission, developed by Getrag for Mitsubishi Motors. The system was first incorporated in the 2008 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.
The operation of TC-SST is smoother than that of a conventional automatic transmission because it uses clutches instead of a torque converter to transmit power. The key to the system's operation is in the electronic and hydraulic controls. TC-SST can select two gears at the same time by putting odd (1st, 3rd, 5th) and even (2nd, 4th, and 6th) gears on separate input shafts, each connected to an individual clutch.
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