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Greenlings: Why do automatic transmissions now get better fuel efficiency than manuals?

Why do automatic transmissions now get better fuel efficiency than manuals?

Not so long ago, it was common for automatic transmissions to be referred to as slushboxes, since that's how they often behaved. Rather than use a mechanical clutch, traditional automatic transmissions use a fluid coupling between the engine and the gear-sets to transmit drive torque. This provides some benefits, but isn't a perfect system.

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

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.

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

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.

Double-clutch transmissions graduate to the world of commercial trucks

Fuso Duonic dual-clutch-transmission – Click above to enlarge

Ford starts production of 6-speed dual clutch PowerShift transmission

Ford PowerShift transmissions on the line – Click above for high-res image gallery

Ford starts production of six-speed dual clutch PowerShift transmission

Ford PowerShift transmissions on the line – Click above for high-res image gallery

Ford announces 2.0-liter EcoBoost and dual-clutch gearbox for 2010

Ford Explorer America Concept - Click above for a high-res image gallery

Ford announces 2.0l ecoboost and dual clutch gearbox for 2010

2010 Mercury Milan Hybrid - Click above for high-res image gallery

Audi offers 3 diesels, auto start-stop in new A5 Sportback

2010 Audi A5 Sportback - Click above for high-res image gallery

Audi adds dual clutch S-Tronic to Euro A4 and A5

Audi has just added a new transmission option to European-market versions of the A4 and A5. The company's 7-speed S-Tronic dual clutch gearbox is now available with the 2.0L TFSI four cylinder. The A5 picks up 0.3 seconds in the 0-60 run and cuts 1g/km of CO2 emissions with the new gearbox. In the sedan, the mileage is unchanged at 31.8 mpg compared to the 6-speed manual. Here in the U.S., the A4 2.0L currently comes standard with a CVT while manual and conventional automatics are opt

Volkswagen adds 7-speed DSG to European CC

Over in the UK, drivers buying a new Passat CC now have a new transmission option that gives them an extra 1.2 mpg. The 160 hp 1.8L TSI four cylinder can now be paired with VW's 7-speed DSG dual clutch gearbox in place of the 6-speed manual. The DSG yields a combined 32.2 mpg (U.S.) compared to the 31.0 mpg (U.S.) with the manual. Similarly, the CO2 emissions have dropped from 178 g/km to 172 g/km. The 2.0L TDI diesel and gasoline 3.6L V6 are available with the 6-speed DSG, in additio

Without Getrag DCT, Chrysler will stick with conventional 6 speed automatic

Now that Chrysler's deal to build dual clutch transmissions in a joint venture with Getrag is officially kaput, the company will stick with its existing 6-speed automatic for now. In early 2007, Chrysler announced the deal with Getrag to supply up to 700,000 transmissions a year that could cut fuel consumption by six percent. It was part of a series of powertrain announcements that

Audi S3 and S3 Sportback get S tronic dual-clutch trannies

Click above for a high-res gallery of the Audi S3 Sportback

Financing lawsuit threatens Chrysler-Getrag dual clutch transmissions

The current credit crisis could be playing further havoc with Chrysler's future powertrain product plans. In the first half of 2007, Chrysler announced investment plans to build two new engine plants and a transmission plant for 2010 model cars. The transmission facility was to be a joint venture with Getrag to build fuel saving dual clutch transmissions. Chrysler already offers German-built Getrag DCTs in the European specification Journey and Sebring. Unfortunately Getrag's apparent inability

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