Read This: Is it time for American carmakers to give up on dual-clutch transmissions? [w/poll]

Filed under: Etc., Technology, Chrysler, Ford, Read This

Dual-clutch transmissions in plant

Last week, in the midst of Detroit’s first days seeking relief in Chapter 9 of the bankruptcy code, Automotive News contributor Larry P. Vellequette penned an editorial suggesting that American car companies raise the white flag on dual clutch transmissions and give up on trying to persuade Americans to buy cars fitted with them. Why? Because, Vellequette says, like CVT transmissions, they “just don’t sound right or feel right to American drivers.” (Note: In the article, it’s not clear if Vellequette is arguing against wet-clutch and dry-clutch DCTs or just dry-clutch DCTs, which is what Ford and Chrysler use.) The article goes on to state that Ford and Chrysler have experimented with DCTs and that both consumers and the automotive press haven’t exactly given them glowing reviews, despite their quicker shifts and increased fuel efficiency potential compared to torque-converter automatic transmissions.

Autoblog staffers who weighed in on the relevance of DCTs in American cars generally disagreed with the blanket nature of Vellequette’s statement that they don’t sound or feel right, but admit that their lack of refinement compared to traditional automatics can be an issue for consumers. That’s particularly true in workaday cars like the Ford Focus and Dodge Dart, both of which have come in for criticism in reviews and owner surveys. From where we sit, the higher-performance orientation of such transmissions doesn’t always meld as well with the marching orders of everyday commuters (particularly if drivers haven’t been educated as to the transmission’s benefits and tradeoffs), and in models not fitted with paddle shifters, it’s particularly hard for drivers to use a DCT to its best advantage.

Finally, we also note that DCT tuning is very much an evolving science. For instance, Autoblog editors who objected to dual-clutch tuning in the Dart have more recently found the technology agreeable in the Fiat 500L. Practice makes perfect – or at least more acceptable.

What do you think? Vote in our poll below, then have your say in Comments.

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Is it time for American carmakers to give up on dual-clutch transmissions? [w/poll] originally appeared on Autoblog on Mon, 22 Jul 2013 19:31:00 EST. Please see our terms for use of feeds.

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Report: Xtrac develops cheaper gearbox that behaves like dual-clutch

Filed under: Technology

Xtrac IGS

Dual-clutch transmissions are the current Holy Grail when it comes to transferring underhood power to the wheels of the car. Nearly every automaker that does serious business around the world offers DCTs, and the ones that don’t very likely soon will.

It’s easy to understand the draw of the DCT: better performance and greater efficiency. But there are also problems. For instance, two clutch mechanisms mean (theoretically, of course) twice the potential repair costs, and DCTs are generally more expensive than either standard manual transmissions or conventional automatics with torque converters.

Xtrac, a company firmly entrenched in transmissions for racing applications, has developed a new technology called the Instantaneous Gearchange System, which uses a ratcheting mechanism to couple the gear hubs with the main shaft. The system has been under development for two years and has reportedly been put into race duty by multiple motorsports teams.

Apparently, the IGS technology will be less costly than other dual-clutch transmissions and could potentially be adopted by various global automakers. Hat tip to David!

[Source: Gizmag]

Report: Xtrac develops cheaper gearbox that behaves like dual-clutch originally appeared on Autoblog on Sat, 04 Dec 2010 16:05:00 EST. Please see our terms for use of feeds.

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General Motors and SAIC to jointly develop small engine and dual clutch transmission

Filed under: China, Technology, GM

General Motors has reached an agreement with one of its primary Chinese partners, Shanghai Automotive Industries Corp. (SAIC), on the joint development of powertrains for small vehicles.

GM and SAIC will develop and produce a family of four-cylinder engines ranging from 1.0- to 1.5-liters with direct injection and turbocharging. The GTDI engines should cut fuel consumption by around 20 percent compared to similarly-sized engines with equivalent output.

The engine will be used in GM and SAIC vehicles in China and around the world, and to go along with the new engine, the partners will also develop a small dual-clutch transmission that should provide a 10 percent boost in efficiency over current six-speed torque converter automatics. Work on the engine and transmission will occur at GM’s powertrain engineering center in Pontiac, MI and the Pan Asia Technical Automotive Center in Shanghai.

GM has yet to announced when the new powertrains will debut in production, but mid-2011 is a safe bet.

[Source: General Motors]

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General Motors and SAIC to jointly develop small engine and dual clutch transmission originally appeared on Autoblog on Tue, 17 Aug 2010 23:01:00 EST. Please see our terms for use of feeds.

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