![]() Power is transferred from the engine through a dry dual-clutch assembly coupled to a dual-mass flywheel. ![]() A stand-alone TCM sends signals to actuators on the transmission. It uses electric servos and motors as actuators to control clutch operation and transmission shifting. The DCT allows sequential gears to be pre-shifted while operating in another range. Note that these units have considerable internal ratio differences based on application. The D7GF1 unit is behind the smallest, low-torque engines, while the D7UF1 handles higher torque output motors (figures 1 and 2). The D7GF1 and D7UF1 are 7-speed, dual-clutch (DCT), automatically shifted manual transmissions manufactured by Hyundai Powertech, the powertrain division of Hyundai Motors. So, let’s familiarize ourselves with these transmissions so we can confidently approach them! Recently, these vehicles have been showing up at more aftermarket shops with concerns. Hyundai and Kia capitalized on the advantages of dual-clutch transmissions with their 7-speed applications, which have been in production for over ten years. Because of these attributes, they have found a home behind low torque and low horsepower engines. Also, adding a direct mechanical transfer of torque through gears produces the most efficient throughput of any transmission. The absence of a torque converter and an engine-driven oil pump significantly reduces horsepower consumption. Dual-clutch transmissions have become more prevalent in a quest to improve car fuel efficiency.
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