What are the advantages of twin-turbocharging?
2 Answers
Here are the specific advantages of twin-turbocharging: 1. Twin-turbo systems generally come in two forms: two small turbos in parallel, such as in BMW engines where each turbo is responsible for pressurizing half of the cylinders, or a large and small turbo in series, where the small turbo provides quick response at low speeds and the large turbo delivers significant boost at high speeds. 2. A combination of a supercharger and a turbocharger, typically seen in foreign TSI engines, where the supercharger responds quickly but doesn't reach very high RPMs, resulting in less boost than a turbocharger, while the turbocharger responds slower but performs better at high speeds. 3. Using twin-turbocharging combines the quick low-speed response of a single small turbo, minimizing turbo lag as much as possible, with the sufficient boost provided by a single large turbo at high speeds, fully leveraging the turbo's capabilities.
I'm fascinated by the technical principle of twin-turbocharging. It uses two turbos working in division of labor - a small turbo responds quickly at low RPM to reduce lag, while a large turbo delivers power at high RPM. This ensures the engine maintains strong power throughout, enabling smooth acceleration without hesitation when overtaking. Overall efficiency is improved and fuel consumption is reduced. Driving on the highway feels more stable and fuel-efficient, while city driving allows for smooth starts, unlike single turbo systems that often fail. This design is commonly seen in high-performance cars like the BMW M series, making daily driving more effortless.
