What are the differences between DQ381 and DQ380?
2 Answers
DQ380 vs DQ381: The DQ381 reduces engine wear and fuel consumption compared to the DQ380. Here are the detailed differences: In the DQ380, the oil pump gear is engaged with the clutch gear and powered by the clutch. This means the oil pump operates whenever the clutch is engaged, creating oil pressure and consuming some engine power under all conditions. In contrast, the DQ381's oil pump is not directly connected to the clutch. Instead, it has a dedicated power source that activates only when oil pressure is needed and stops when not in use. This design reduces the oil pump's consumption of engine power, theoretically lowering emissions and achieving better fuel efficiency. Compared to the DQ380, the DQ381 features several changes: it uses lower-viscosity ATF oil, optimizes friction in seals and bearings, and modifies the clutch module and hydraulic pump system. The K1 return spring in the clutch module has been changed from a spiral type in the DQ380 to a diaphragm type. Additionally, the hydraulic system now includes an electric oil pump connected to the CAN bus, controlled via valve regulation. This supports the hydraulic circuit for clutch plate engagement and gear shifting operations. The oil also flows to the pressure circuit for lubrication and cooling of shafts, gears, and clutch plates. The addition of the electric oil pump allows the transmission to maintain oil supply to components during start-stop operation and coasting modes, independent of engine speed. It also improves clutch re-engagement responsiveness when restarting the engine.
I've been driving a Volkswagen for many years and noticed that both the DQ381 and DQ380 are dual-clutch transmissions, but the DQ381 is the newer, upgraded version. The biggest difference is lower fuel consumption due to optimized internal friction design, saving you some money on gas over 100 kilometers. The driving experience is smoother, especially in city traffic with significantly less jerking, making it much more comfortable. The torque handling capability has also improved, meaning it pairs better with powerful engines for quicker, more responsive acceleration. Long-term maintenance is more worry-free, with reduced gear wear and longer service intervals. Safety-wise, there aren't major changes, but overall reliability is better. When choosing a car, prioritize models with the DQ381—most new vehicles use it, and in the used car market, pay attention to the model to avoid unnecessary expenses.
