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Twin Clutch SST

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Automotive transmissions
Manual
Automatic / Semi-automatic

Twin Clutch SST (Sport Shift Transmission or Sportronic Shift Transmission) is the brand name of a 6 speed twin-clutch transmission developed by Mitsubishi Motors. The system was first incorporated in the 2007 Lancer Evolution X.[1][2]

Twin Clutch SST, Mitsubishi's first-ever automated manual transmission, uses dual clutches to realize power transmission efficiencies on a par with a normal manual gearbox while allowing quick gear shifting with no drop-off in engine power. It delivers greater acceleration while also returning better fuel mileage thanks to its high-efficiency power transmission mechanism. The system can be operated by both a console-mounted shifter and magnesium steering wheel paddle shifters and offers manual and fully automatic modes.[1][2]

Twin Clutch SST also works in conjunction with Mitsubishi's S-AWC system.[3]

Operation

Twin Clutch SST puts odd (1st, 3rd, 5th) and even (2nd, 4th and 6th) gears on separate input shafts, each connected to an individual clutch. With both clutches under precise system control, this arrangement allows extremely fast, smooth and lag-free gear changes with no interruption in power delivery. Using clutches instead of a torque converter to transmit power makes the Twin Clutch SST simpler in structure and reduces power transmission losses for higher transmission efficiency that leads to improved fuel mileage.[1]

Drive modes

Twin Clutch SST allows switching between three shifting programs — Normal, Sport and S-Sport.[1]

  • Normal mode

For use around town and other normal driving situations, Normal mode uses relatively low-speed shift points to deliver unobtrusive shifting together with optimum fuel economy.

  • Sport mode

For use when driving in the mountains or when engine braking is required, Sport mode uses higher shift points and quicker shifting to deliver instant throttle response.

  • S-Sport mode

Compared with Sport mode, S-Sport mode keeps the engine turning at higher revs, allowing even faster shifting.

References

  1. ^ a b c d "Mitsubishi Motors develops S-AWC vehicle dynamics control system & Twin Clutch SST automated manual transmission", Mitsubishi Motors press release
  2. ^ a b "2008 Mitsubishi Lancer Evolution Debuts Two New Transmissions: 6-Speed Twin-Clutch Sportronic Shift Transmission (TC-SST) For Evolution Mr And 5-Speed Manual For Evolution GSR", Mitsubishi Motors North America press release
  3. ^ "Mitsubishi Motors' S-AWC Integrally Controls Vehicle Behaviors with 2 ECUs", Naoshige Shimizu, Nikkei Electronics, July 11 2007
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