Why does a dry dual-clutch transmission make a clunking noise at low speeds?
2 Answers
Dry dual-clutch transmission makes clunking noise at low speeds due to its inherent structural design or issues with power tuning. Below is an introduction to the clunking noise of dry dual-clutch transmissions at low speeds: 1. Inherent structural design of dry dual-clutch transmissions: A dual-clutch transmission is equipped with two clutches, each independently connected to a set of gears, controlling odd and even gears respectively. When the hydraulic servo system of the clutch or the transmission computer cannot accurately control the separation and engagement of the gears, abnormal noises and jerks occur. 2. Issues with power tuning: To optimize the user experience of dual-clutch transmissions, engineers also tune the matching between the transmission and the engine. The level of tuning by the engineers directly affects the smoothness of the vehicle's driving. However, optimizing the smoothness of the powertrain is a more complex engineering task than imagined, and domestic manufacturers relatively lack tuning expertise and experimental technology accumulation. Therefore, most domestic brands entrust foreign suppliers to tune the powertrain, but the levels vary. Jerks and abnormal noises often result from tuning issues.
Driving a car with a dry dual-clutch transmission, the clunking noise during low-speed stop-and-go traffic is simply unbearable. I heard from a mechanic that this happens because the clutch plates constantly rub and vibrate during low-speed semi-engagement, and without oil for cooling and lubrication, the noise is more likely to occur. When I drive, I've noticed that lightly pressing the accelerator and avoiding lower gears can reduce the noise. I remember last winter, the sound was even louder right after starting the car, but it improved a bit after switching to a better driving mode. This also reminds me to pay attention to maintenance and not delay transmission servicing for too long. From what friends have shared, most cars are like this, so there's no need to worry too much, but if the noise gets too loud, it's time for a check-up. Oh, and try to avoid prolonged stopping and starting on slopes—that can make the problem worse.
