Twin Clutch SST: Difference between revisions

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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-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.^[3] 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.^[3] 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.^[2]^[3] TC-SST also works in conjunction with Mitsubishi's 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 torque converter to transmit power.^[4] 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. While one gear is engaged by one of the two electro-hydraulically operated wet multi-plate clutches, the other is pre-selected, waiting to be engaged by the second wet multi-plate clutch. The TC-SST, in principle, behaves like two three-speed manual transmissions operating on the same output shaft. With both clutches under precise system control, the gear change is made when the clutches are "swapped" simultaneously, allowing fast, smooth gear changes with no interruption in power delivery.^[1]^[2]^[3] Nevertheless, those who prefer the traditional "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 transfer gear, resulting in a shorter overall transmission length. The transmission electronic control unit (ECU), sensors, and 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

^ ^a ^b "SS-T: The Magic Inside the Evo X", The Motor Report, April 14, 2008
^ ^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.
^ ^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.
^ ^a ^b ^c "Technical Analysis: Twin-Clutch Sportronic Shift Transmission", Shaun Bailey, Road & Track, March 2008
^ "2008 Mitsubishi Lancer Evo MR: TC-SST Gearing", Brent Romans, Inside Line, August 21, 2008
^ "Mitsubishi Motors' S-AWC Integrally Controls Vehicle Behaviors with 2 ECUs", Naoshige Shimizu, Nikkei Electronics, July 11, 2007
^ "Stop this twin-clutch madness now", John McIlroy, Autocar, April 8, 2008
^ "Mitsubishi Lancer RalliArt – Twin Clutch SST Transmission", MPG-o-matic
^ "Mitsubishi releases details on S-AWC and Twin Clutch SST", Damon Lavrinc, Autoblog.com, July 10, 2007
^ "Mitsubishi reveals Twin Clutch SST gearbox", Paultan.org, July 10, 2007

External links

Getrag Powershift 6DCT470 Transmission and Presskit, Getrag website
"Twin Clutch-SST (Sport Shift Transmission) systematic", TC-SST schematic, .pdf file, Mitsubishi Motors North America press release

[tmr-au-1] "SS-T: The Magic Inside the Evo X", The Motor Report, April 14, 2008

[sstjapan-2] "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.

[sstusa-3] "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.

[roadandtrack-4] "Technical Analysis: Twin-Clutch Sportronic Shift Transmission", Shaun Bailey, Road & Track, March 2008

[insideline-5] "2008 Mitsubishi Lancer Evo MR: TC-SST Gearing", Brent Romans, Inside Line, August 21, 2008

[ecu-6] "Mitsubishi Motors' S-AWC Integrally Controls Vehicle Behaviors with 2 ECUs", Naoshige Shimizu, Nikkei Electronics, July 11, 2007

[madness-7] "Stop this twin-clutch madness now", John McIlroy, Autocar, April 8, 2008

[mpgomatic-8] "Mitsubishi Lancer RalliArt – Twin Clutch SST Transmission", MPG-o-matic

[autoblog-9] "Mitsubishi releases details on S-AWC and Twin Clutch SST", Damon Lavrinc, Autoblog.com, July 10, 2007

[paultan-10] "Mitsubishi reveals Twin Clutch SST gearbox", Paultan.org, July 10, 2007

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@@ Line 1: / Line 1: @@
+{{Short description|Transmission developed by Mitsubishi}}
 {{transmission types}}
+[[File:2010_Mitsubishi_Lancer_(CJ_MY11)_Ralliart_Sportback_hatchback_(2010-10-16)_01.jpg | thumb | right]]
-'''Twin Clutch SST (Sport Shift Transmission)''' is the [[brand name]] of a [[Twin-clutch_gearbox|twin-clutch transmission]] developed by [[Mitsubishi Motors]]. The first application to incorporate the system will be the new 2007 [[Lancer Evolution]].
+'''Twin Clutch SST''' ('''Sport-''' or '''Sportronic Shift Transmission''') is the [[brand name]] of a six-speed [[dual-clutch transmission|dual-clutch automatic transmission]], developed by [[Getrag]] for [[Mitsubishi Motors]].<ref name="tmr-au">[http://www.themotorreport.com.au/4259/ss-t-the-magic-inside-the-evo-x/ "SS-T: The Magic Inside the Evo X"], ''The Motor Report'', April 14, 2008</ref> The system was first incorporated in the 2008 [[Mitsubishi Lancer Evolution|Lancer Evolution X]],<ref name=sstjapan>{{cite press release|url=http://media.mitsubishi-motors.com/pressrelease/e/corporate/detail1657.html|title=Mitsubishi Motors develops S-AWC vehicle dynamics control system & Twin Clutch SST automated manual transmission|publisher=Mitsubishi Motors|date=10 July 2007|accessdate=10 November 2009}}</ref><ref name="sstusa">{{cite press release|url=http://media.mitsubishicars.com/detail?mid=MIT2007111673183&mime=ASC|title=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|publisher=Mitsubishi Motors North America, Inc.|date=15 November 2007|accessdate=10 November 2009|url-status=dead|archiveurl=https://archive.today/20070422180304/http://media.mitsubishicars.com/detail?mid=MIT2007111673183&mime=ASC|archivedate=22 April 2007}}</ref> and was designed to be a more performance-oriented system than that developed by rival manufacturers,<ref name="roadandtrack">[http://www.roadandtrack.com/article.asp?section_id=2&article_id=6388 "Technical Analysis: Twin-Clutch Sportronic Shift Transmission"], Shaun Bailey, ''[[Road & Track]]'', March 2008</ref> with shorter gear ratios optimized for acceleration.<ref name="insideline">[http://blogs.insideline.com/roadtests/2008/08/2008-mitsubishi-lancer-evo-mr-tc-sst-gearing.html "2008 Mitsubishi Lancer Evo MR: TC-SST Gearing"], Brent Romans, ''[[Inside Line]]'', August 21, 2008</ref>
-A type of [[Semi-automatic_transmission|automated manual transmission]], Twin Clutch SST employs dual [[clutch]]es to realize power transmission [[Energy_conversion_efficiency|efficiencies]] on a par with a normal [[Manual_transmission|manual gearbox]] while allowing slick and swift [[Gear_shift|shifting]]. Allowing rapid shifting up and down through the [[gears]], it delivers greater [[acceleration]] while also returning better [[Fuel_economy_in_automobiles|fuel mileage]] thanks to its high-efficiency power transmission mechanism. The new transmission also features three operating modes tailored to different situations: from around-town drivability to instant-response and sporty motoring on the open road.
 ==Operation==
+TC-SST uses dual-[[clutch]]es 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]].<ref name="sstusa"/> The system's high-efficiency power transmission mechanism is on par with a normal manual gearbox while allowing quicker [[gear shift]]ing with no drop-off in engine power, thus offering greater [[performance]] and better [[fuel economy in automobiles|fuel economy]].<ref name="sstusa"/> 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.<ref name=sstjapan/><ref name="sstusa"/>  TC-SST also works in conjunction with Mitsubishi's [[S-AWC]] system.<ref name="ecu">[http://techon.nikkeibp.co.jp/english/NEWS_EN/20070711/135850 "Mitsubishi Motors' S-AWC Integrally Controls Vehicle Behaviors with 2 ECUs"], Naoshige Shimizu, Nikkei Electronics, July 11, 2007</ref>
-Twin Clutch SST puts odd (1st, 3rd, 5th) and even (2nd, 4th and 6th) gears on separate [[Driveshaft|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 [[Transmission_%28mechanics%29|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.
+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.<ref name="roadandtrack"/> The key to the system's operation is in the [[electronics|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. While one gear is engaged by one of the two electro-hydraulically operated wet [[multi-plate clutch]]es, the other is pre-selected, waiting to be engaged by the second wet multi-plate clutch. The TC-SST, in principle, behaves like two three-speed manual transmissions operating on the same output shaft. With both clutches under precise system control, the gear change is made when the clutches are "swapped" simultaneously, allowing fast, smooth gear changes with no interruption in power delivery.<ref name="tmr-au"/><ref name=sstjapan/><ref name="sstusa"/> Nevertheless, those who prefer the traditional "[[stick shift]]" have criticized the level of driver involvement in TC-SST and other dual-clutch transmissions.<ref name="madness">[http://www.autocar.co.uk/blogs/stillatthewheel/archive/2008/04/08/stop-this-twin-clutch-madness-now.aspx "Stop this twin-clutch madness now"], John McIlroy, ''[[Autocar (magazine)|Autocar]]'', April 8, 2008</ref>
+The odd and even gear shafts are linked via a [[transfer case|transfer gear]], resulting in a shorter overall transmission length. The transmission [[electronic control unit]] (ECU), sensors, and [[solenoids]], are all housed within the [[valve gear|transmission valve]] body. The TC-SST is equipped with a transmission [[radiator|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;<ref name="mpgomatic">[http://www.mpgomatic.com/2009/08/13/mitsubishi-lancer-ralliart-twin-clutch-sst-transmission/ "Mitsubishi Lancer RalliArt – Twin Clutch SST Transmission"], MPG-o-matic</ref> "Sport", for use when driving in the mountains or when [[engine braking]] is required;<ref name="autoblog">[http://www.autoblog.com/2007/07/10/mitsubishi-releases-details-on-s-awc-and-twin-clutch-sst/ "Mitsubishi releases details on S-AWC and Twin Clutch SST"], Damon Lavrinc, Autoblog.com, July 10, 2007</ref> and "S-Sport", which keeps the engine turning at even higher [[Revolutions per minute|revs]] compared to "Sport".<ref name="paultan">[http://paultan.org/2007/07/10/mitsubishi-reveals-twin-clutch-sst-gearbox/ "Mitsubishi reveals Twin Clutch SST gearbox"], Paultan.org, July 10, 2007</ref> "[[Launch control (automotive)|Launch control]]" is also available only in "S-Sport" mode.
-Twin Clutch SST allows switching between three shifting programs — Normal, Sport and S-Sport.
+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.<ref name="roadandtrack"/>  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.
-*''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.
+===Gear ratios for Lancer Evolution X MR===
-*''Sport mode''
+{| class="wikitable" style="width:10em; text-align:center"
-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_body|throttle response]].
+|-
+! 1st
+! 2nd
+! 3rd
+! 4th
+! 5th
+! 6th
+! final
+|-
+| 3.655
+| 2.368
+| 1.754
+| 1.322
+| 1.008
+| 0.775
+| 4.065
+|-
+|}
+{{refbegin}}
+''(Source: [http://blogs.insideline.com/roadtests/2008/08/2008-mitsubishi-lancer-evo-mr-tc-sst-gearing.html "2008 Mitsubishi Lancer Evo MR: TC-SST Gearing"], Brent Romans, ''[[Inside Line]]'', August 21, 2008'')
+{{refend}}
+===Gear ratios for Lancer Ralliart===
-*''S-Sport mode''
+{| class="wikitable" style="width:10em; text-align:center"
-Compared with Sport mode, S-Sport mode keeps the engine turning at higher [[Rpm|revs]], allowing even faster shifting.
+|-
+! 1st
+! 2nd
+! 3rd
+! 4th
+! 5th
+! 6th
+! final
+|-
+| 3.655
+| 2.368
+| 1.754
+| 1.322
+| 0.983
+| 0.731
+| 4.062
+|-
+|}
+{{refbegin}}
+''(Source: [http://www.mitsubishi-motors.com.au/vehicles/lancer-ralliart/specifications "2014 Mitsubishi Lancer-Ralliart Specifications"])
+{{refend}}
-==External links==
+==Applications==
+*[[Mitsubishi Lancer#Lancer Ralliart|Mitsubishi Lancer Ralliart]]
-*[http://mmna.wieck.com/forms/mmna/files/PDF/E05_TC-SST_A3.pdf "Twin Clutch-SST (Sport Shift Transmission) systematic"], TC-SST shematic, .pdf file, Mitsubishi Motors North America press release
+*[[Mitsubishi Lancer Evolution X]]
+*[[Mitsubishi Outlander]] / [[Citroën C-Crosser]] / [[Peugeot 4007]]
 ==References==
+{{reflist|30em}}
-#[http://media.mitsubishi-motors.com/pressrelease/e/corporate/detail1657.html "Mitsubishi Motors develops S-AWC vehicle dynamics control system & Twin Clutch SST automated manual transmission"], Mitsubishi Motors website
+==External links==
+*[http://www.getrag.de/en/234 Getrag Powershift 6DCT470 Transmission] and [http://www.getrag.de/media/0000001375.zip Presskit], Getrag website
+*[http://mmna.wieck.com/forms/mmna/files/PDF/E05_TC-SST_A3.pdf "Twin Clutch-SST (Sport Shift Transmission) systematic"], TC-SST schematic, .pdf file, Mitsubishi Motors North America press release
 {{Mitsubishi Motors technologies}}
-[[Category:Mitsubishi technologies]]
+{{DEFAULTSORT:Twin Clutch Sst}}
-[[Category: Automotive transmission technologies]]
-[[Category:Automotive technology tradenames]]
+[[Category:Dual-clutch transmissions]]
+[[Category:Mitsubishi Motors technologies]]

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