Twin Clutch SST

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Automotive transmissions
Manual
Automatic / Semi-automatic

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.[1] The system was first incorporated in the 2008 Lancer Evolution X,[2][3] and was designed to be a more performance-oriented system than that developed by rival manufacturers,[4] with shorter gear ratios optimized for acceleration.[5]

Operation

TC-SST uses dual-

S-AWC system.[6]

The operation of TC-SST is smoother than that of a conventional automatic transmission because it uses clutches instead of a

stick shift" have criticized the level of driver involvement in TC-SST and other dual-clutch transmissions.[7]

The odd and even gear shafts are linked via a

solenoids, are all housed within the transmission valve body. The TC-SST is equipped with a transmission oil-cooler
, and uses a synthetic fluid, designed for twin-clutch transmissions (see owner's manual).

Drive modes

TC-SST allows switching between three shifting programmes: "Normal", which uses relatively low engine-speed shift points to deliver conservative shifting biased towards optimized fuel economy;[8] "Sport", for use when driving in the mountains or when engine braking is required;[9] and "S-Sport", which keeps the engine turning at even higher revs compared to "Sport".[10] "Launch control" is also available only in "S-Sport" mode.

Note: "S-Sport" is only available from the factory on Evolution X MR editions and not on the TC-SST found in current Lancer Ralliart, which makes do with Normal and Sport modes.[4] Towards the end of 2012, however, aftermarket car tuners figured out how to successfully flash/reflash (see Chip tuning for details) the Lancer Ralliart's Transmission control unit with the Evolution X MR's transmission software, giving the Lancer Ralliart "S-Sport mode", which includes higher RPM engine operation and launch control. Debate still exists, however, regarding whether or not the different 5th and 6th gear ratios found in the Ralliart transmission (when compared to the Evo X MR TC-SST, see gear ratios below) adds extra mechanical stress to an "S-Sport Mode" flashed Ralliart Transmission.

Gear ratios for Lancer Evolution X MR

1st 2nd 3rd 4th 5th 6th final
3.655 2.368 1.754 1.322 1.008 0.775 4.065

(Source: "2008 Mitsubishi Lancer Evo MR: TC-SST Gearing", Brent Romans,

Inside Line
, August 21, 2008)

Gear ratios for Lancer Ralliart

1st 2nd 3rd 4th 5th 6th final
3.655 2.368 1.754 1.322 0.983 0.731 4.062

(Source: "2014 Mitsubishi Lancer-Ralliart Specifications")

Applications

References

  1. ^ a b "SS-T: The Magic Inside the Evo X", The Motor Report, April 14, 2008
  2. ^ a b c "Mitsubishi Motors develops S-AWC vehicle dynamics control system & Twin Clutch SST automated manual transmission" (Press release). Mitsubishi Motors. 10 July 2007. Retrieved 10 November 2009.
  3. ^ a b c d e "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" (Press release). Mitsubishi Motors North America, Inc. 15 November 2007. Archived from the original on 22 April 2007. Retrieved 10 November 2009.
  4. ^ a b c "Technical Analysis: Twin-Clutch Sportronic Shift Transmission", Shaun Bailey, Road & Track, March 2008
  5. Inside Line
    , August 21, 2008
  6. ^ "Mitsubishi Motors' S-AWC Integrally Controls Vehicle Behaviors with 2 ECUs", Naoshige Shimizu, Nikkei Electronics, July 11, 2007
  7. ^ "Stop this twin-clutch madness now", John McIlroy, Autocar, April 8, 2008
  8. ^ "Mitsubishi Lancer RalliArt – Twin Clutch SST Transmission", MPG-o-matic
  9. ^ "Mitsubishi releases details on S-AWC and Twin Clutch SST", Damon Lavrinc, Autoblog.com, July 10, 2007
  10. ^ "Mitsubishi reveals Twin Clutch SST gearbox", Paultan.org, July 10, 2007

External links

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