Throughout the development process, engineers have been targeting a seven percent improvement in fuel efficiency and a five percent improvement in acceleration (0-100 kph / 62 mph) over the existing six-speed DCT transmission. NVH has also been a key focus for the team behind the DCT’s development, with an external damper ensuring a high level of refinement for the new transmission.
The DCT is made up of two dry clutches, each fitted with an electric motor-driven clutch actuator to improve fuel economy, and a pair of gear input shafts, one each for the odd and even gear ratios. This set-up enables the DCT to operate sequentially or to jump immediately to any of its seven forward gears (and reverse) depending on the driver’s requirements.
The continuous power delivery offered by the DCT minimises the loss of torque by the powertrain during gear shifting and ensures a smoother drive in all conditions. The wide ratio coverage afforded to the engine by the seven-speed gearbox results in improved fuel efficiency and performance over rival six-speed DCTs.
The new seven-speed dual-clutch transmission will start to appear on production Kia cars in 2015.