Is the DCT Dual Clutch Transmission Dry or Wet?

[SanMila]

Dual clutch transmission (DCT) can be either dry or wet. Here is some relevant information about dual clutch transmissions: 1. Definition: The Dual Clutch Transmission (DCT) differs from conventional automatic transmission systems. It is based on manual transmissions but is not an automatic transmission. In addition to offering the flexibility of manual transmissions and the comfort of automatic transmissions, it also provides uninterrupted power output. 2. Working Principle: The key technology of the dual clutch transmission lies in the dual clutch, which means there are two clutches. One is responsible for the odd-numbered gears (1st, 3rd, 5th, 7th), while the other clutch handles the even-numbered gears (2nd, 4th, 6th).

[DiAniyah]

Dual-clutch transmissions (DCT) come in two designs: dry and wet, with the main difference lying in the cooling method of the clutches. Dry DCT clutches are not immersed in oil and are directly exposed to air, featuring a simple structure and lighter weight, making them suitable for small-displacement family cars, though they are prone to overheating in urban traffic congestion. Wet DCT clutches, on the other hand, are submerged in transmission oil, which provides lubrication and cooling. Although this increases weight and cost, it makes them more suitable for high-torque models. My car has a wet dual-clutch transmission, and it performs exceptionally well when climbing hills. Nowadays, mainstream brands choose between the two based on the vehicle's positioning—for example, the Volkswagen Golf uses a dry DCT, while the Passat opts for a wet one.

[CaliDella]

I've worked with both dry and wet dual-clutch transmissions. The former has lower costs and a simpler structure, making it suitable for compact cars, but it's prone to overheating due to friction in traffic jams; the latter relies on oil cooling for greater durability and can handle higher power output, commonly used in performance cars and SUVs. When choosing a car, consider the usage scenario: opt for the dry type for better fuel efficiency in city driving, while the wet type is more reliable for frequent highway or mountainous driving. Mechanics say many wet transmissions can last 200,000 kilometers without issues, provided oil changes and maintenance are done on time. Hyundai and Kia use dry types for entry-level models and switch to wet types for their flagship models.

[VonMary]

Dual-clutch transmissions come in two types: dry and wet, with the core difference lying in their cooling designs. Dry types rely on air for cooling, offering a compact structure and high efficiency but poorer durability; wet types use oil circulation for cooling, providing slightly lower transmission efficiency but greater robustness. Recently, a trend has emerged where new energy vehicles are adopting simplified wet dual-clutch systems, like BYD's DM-i system, which optimizes the cooling structure in combination with electric motors. Back in the day, Porsche's PDK was a classic example of wet dual-clutch technology, and now even some domestically produced cars in the 100,000-yuan range are using wet types. For daily driving, wet types are more worry-free, especially during summer traffic jams when you don't have to worry about them failing midway.