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Mitsubishi Motors Develops Twin Clutch SST Automated Manual Transmission

Mitsubishi Motors Corporation (MMC) has developed a twin clutch Sport Shift Transmission (SST) for the new Lancer Evolution, due to be launched this fall. The new automated six-speed manual transmission can help improve fuel economy by up to 15% over existing five-speed automatic gearboxes, according to the company.

MMC also is introducing an advanced vehicle dynamics control system—S-AWC (Super All Wheel Control)—for the Lancer that regulates drive torque at each wheel.

The new automated manual transmission employs dual clutches to realize power transmission efficiencies on a par with a normal manual gearbox while also allowing slick and swift shifting while returning lower fuel consumption due to its high-efficiency power transmission mechanism.

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 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 economy.

Twin Clutch SST allows the driver to switch between three shifting programs—Normal, Sport and S-Sport—to cover the full range of driving situations, from town use to sporty motoring on open roads.

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

  • For use when driving in the mountains or when engine braking is required, Sport mode scheduling uses higher shift points and quicker shifting to deliver instant throttle response that instills in the driver a closer man/machine relationship.

  • Compared with Sport mode, S-Sport mode scheduling keeps the engine turning at higher revs while allowing lightening-fast shifting.

S-AWC. The S-AWC system adds an ASC (Active Stability Control) feature to the ACD (Active Center Differential), AYC  (Active Yaw Control) and Sport ABS  (Sport Antilock Brake System) components that have proven themselves in the Lancer Evolution series. Integrated system management of these four components allows regulation of torque and braking force at each wheel.

The S-AWC vehicle dynamics control system integrates management of all its AYC, ACD, ASC and Sport ABS components (see below) while adding braking force control to Mitsubishi Motors’ own AYC system. As a result S-AWC elevates drive power, cornering performance as well as vehicle stability under all driving situations, from everyday motoring to emergency evasion maneuvers.

S-AWC also now employs yaw rate feedback control. This allows the system to control each wheel under a wide range of driving conditions.



With all of their current experience with ABS, AYC, ACD, and now S-AWC it should make the programming for individual wheel motors much easier to pull out every bit of performance/safety benefits.


Sounds awesome, and a year or two ago I would've been drooling over this. Now I wish it was an EV, a hybrid, or at least a mild hybrid with caps. I'm getting old.

This will be an amazing car, but they'll sell even less than they did of their first EVO because gas prices are so high that an EVO is hard to justify. Sure you COULD drive it slow and still get good fuel economy with this new, amazing tranny, but that requires a level of self control that can only be called masochistic. WHY CAN'T GAS BE CHEAP AND POLLUTION AND TERROR FREE? WHY?

And whatever happened to their electric, in wheel motor, EVO? I'll be doing pretty well pretty soon. I want a sports car, not a $100,000 Tesla, but an EVO would be in range, if not for FREAKIN'GAS PRICES. This sucks. Sorry for the rant.


Elliot, I don't think you'd like it here in the UK, we pay over $7 per gallon for gasoline! (And still, we have lots of EVOs)


Elliot...You're getting smarter, not older. Stay with the EV idea. All these transmission, E85, turbo-diesel, hybrid, & computer controlled Internal Combustion Engine(ICE) ideas are the death throes of ICE. EVs already have the economy, smoothness, power, & control that these ICE innovations are trying to have. Yet, EVs retain their simplicity. Just have to get the electrical storage densities(power in a light small package) up & EVs will be unbeatable.
ICE is trying to be an EV Wannabe which won't happen if consumers truly see the elegance of EVs. Soon may ICE be dead. Long live EVs.


Clett, I'd love to live in the UK (I've actually been considering it recently), but there as here, I'd have to drive an PH/EV as my next car. ICE just doesn't make sense anymore. It was great, but if they could make an electric EVO it'd smoke the ICE one. And I wouldn't have to pay for gas. Plus I really don't like where that money goes - be it in the US gov't, the M.E. gov't or the terrorists.

Thanks litesong. EV's are pretty much superior in every way. I guess I'll keep driving my car and wait for the Tesla to get where I want it to be feature-wise (basically just quick recharge) and keep saving my pennies. I like the way it looks more than the EVO. It's 0-60 is over a second faster than a stock Supra Turbo. I probably wouldn't want to drive any faster than 130 anyway (at the track of course), so no problem there.

Anyone know of any high performance electric car kits so that I could convert another car to get Tesla comparable awesomeness for less $? Show people an EV RX-7 that can smoke a turbo one and that's going to get a lot of people interested.

Rafael Seidl

@litesong -

stability control, yaw control and anti-lock brakes are handling support features that are separate from the drivetrain, though they may co-ordinate with the drivetrain controller.

As for "death throes", so far that's wishful thinking. The number of cars and trucks without an ICE remains tiny. Indeed, as a share of global vehicle sales, even hybrids are actually declining - never mind EVs. On a global scale, the global fuel supply/CO2 emissions issue will get (a lot) worse before it gets any better.


Rafael...With inwheel electric motors, all those devices you just mentioned are in the drive train. With all the hoopla over the trinkets to fine tune ICE, all that is needed for EVs to bury ICE is to raise electrical energy density storage...for both mobile EV range extension & stationary interruptable but renewable electrical energy storage.

High electrical energy density storage is happening on several technological trails. Not till recently could we see these EV advancements, but now we see light at the end of tunnel...granted, far away. But for ICE advocates, it is not far enough away & they have begun to wishfully think. May ICE die, that people may live. Long live EVs.



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