Examine individual changes

'{{transmission types}} '''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]].<ref name="autozine">[http://www.autozine.org/technical_school/gearbox/tech_gear_manual.htm "Transmission - Twin-Clutch Gearbox"] {{webarchive|url=https://web.archive.org/web/20100201212502/http://www.autozine.org/technical_school/gearbox/tech_gear_manual.htm |date=2010-02-01 }}, Autozine Technical School</ref><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|deadurl=yes|archiveurl=https://archive.is/20070422180304/http://media.mitsubishicars.com/detail?mid=MIT2007111673183&mime=ASC|archivedate=22 April 2007|df=}}</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> ==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> 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="autozine"/><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, awaiting 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. 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. ===Gear ratios for Lancer Evolution X MR=== {| class="wikitable" style="width:10em" ; text-align:center" |- ! 1st ! 2nd ! 3rd ! 4th ! 5th ! 6th ! final |- | 3.655 | 2.368 | 1.754 | 1.322 | 1.000 | 0.775 | 4.062 |- |} {{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=== {| class="wikitable" style="width:10em" ; text-align:center" |- ! 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}} ==Applications== *[[Mitsubishi Lancer#Lancer Ralliart|Mitsubishi Lancer Ralliart]] *[[Mitsubishi Lancer Evolution X]] *[[Mitsubishi Outlander]] / [[Citroën C-Crosser]] / [[Peugeot 4007]] ==References== {{reflist|30em}} ==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}} {{DEFAULTSORT:Twin Clutch Sst}} [[Category:Mitsubishi Motors technologies]] [[Category:Automotive transmission technologies]] [[Category:Automotive technology tradenames]]'