2021 Hyundai Santa Fe – 8DCT 'Smartstream' Transmission (Wet 8-speed Double-Clutch Transmission)
A newly developed 8-speed wet double-clutch transmission (8DCT), offering the smooth shifting characteristics of a conventional automatic transmission while enhancing efficiency over dry dual clutch transmissions.
Compared to a 7-speed double-clutch transmission, maximum torque capacity is increased by 58% thanks to an optimum clutch cooling performance, achieved through a dedicated electric oil pump for lubrication.
The high efficiency hydraulic control system consists of an on-demand control-based electric oil pump and accumulator. Fuel efficiency is improved by 3% through reduced engine power loss and increased hydraulic efficiency, in comparison to 8-speed automatic transmission models.
The new 8DCT also creates a more dynamic driving experience and enhances acceleration performance by up to 9%, compared to 6-speed manual transmission models.