Dual Dry Clutch Transmission (DDCT) - Late Availability

Strong acceleration characteristics combined with more fuel efficiency on the highway are two of the main attributes of Chrysler Group's newest transmission, the six-speed C636 Dual Dry Clutch Transmission (DDCT). The new, transverse-mounted gearbox will be available in the 2011 model year on the Chrysler 200 Touring models equipped with the 2.4-liter World Gas Engine (late availability).

The DDCT is the first powertrain application in a Chrysler Group vehicle as a result of the company's partnership with Fiat. It is designed specifically for lighter vehicle applications and is a first for Chrysler Group passenger cars.

Electro-hydraulically activated, the DDCT six-speed is expected to improve fuel efficiency.

Unlike traditional six-speed transmissions, the dual dry clutch transmission eliminates the torque converter and pumping losses associated with wet clutch transmissions.

The DDCT essentially is designed to operate much like a manual transmission, with two clutch discs driven independently by a common flywheel assembly. Odd numbered gears (1, 3 and 5) are located on one shaft assembly while even gears (2, 4 and 6) are on the other. Two gearboxes running in parallel, each with its own clutch, allows for the selection and engagement of subsequent gears, while the previous gear is still engaged. Gear changes are gradual rather than abrupt, ensuring a continuous delivery of engine torque and traction. Simply put, the gear is anticipated and pre-selected. As one clutch is opened, the other is closed, allowing shifting without torque interruption, resulting in quicker acceleration and near seamless shifting.

Additionally, with the lay-shaft arrangement of gears, there is flexibility to optimize gear selections for peak performance and fuel economy.

Smoother shifts, due to ideal gear spacing, are immediately noticeable to the driver. Ratios have been ideally spaced to help provide a smooth transition in-between gear changes. Using an ideal set of gears, the transition from first to sixth is smooth, with virtually none of the torque transfer generally associated with gear shifts in traditional automatic transmissions.

Precise shifting and a reduction of engine rpm's are key benefits that result in lower emissions. The use of a six-speed automatic also allows the driver a broad range of shifting behaviors, from enthusiasts looking for sporty performance, to commuters looking for optimal fuel efficiency.

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