What is Twin-Scroll Turbocharging?
2 Answers
Twin-scroll turbocharging refers to the use of a more compact and simpler turbocharger, which enhances the scavenging efficiency of the engine, providing rapid response and performance comparable to that of twin turbochargers. Below is an introduction to twin-scroll turbocharging: 1. Function: Twin-scroll turbocharging can increase scavenging efficiency, thereby optimizing the distribution of exhaust pressure and directing the kinetic energy of exhaust gases to the turbine. This ultimately allows for better intake and exhaust overlap, improving the air quality within the cylinders. 2. Advantages: Upgrading to a twin-scroll turbocharger can deliver better torque output at low RPMs and further enhance turbo output at high RPMs, making it an irresistible temptation for modifiers.
The twin-scroll turbocharger is essentially a smarter design compared to conventional turbos. I've been thinking about this for a long time. For example, a regular turbo only uses a single exhaust stream to spin the turbine, but at low RPMs, the exhaust flow is slow—you step on the gas and wait ages for acceleration, which feels frustrating. The twin-scroll design splits the engine's exhaust into two separate streams—say, cylinders 1 and 4 in one path and 2 and 3 in another for a four-cylinder engine. This way, at low RPMs, the exhaust flows don't interfere with each other, allowing them to spin the turbine faster and deliver quicker response. You can zoom off the line at traffic lights effortlessly. It also reduces turbo lag and improves fuel efficiency. However, the more complex structure might lead to higher maintenance costs, but the smooth driving experience is absolutely worth it. If you frequently drive in the city, this technology is a real blessing.
