A twin-turbocharger is a technology that uses two turbochargers to enhance the engine performance and efficiency. By optimizing boost pressure and reducing the turbo lag, it delivers better power output across a wider range of engine speeds.
There are two main types of twin-turbo systems: parallel twin-turbo and sequential twin-turbo.
The simplest twin-turbo arrangement is parallel twin-turbo. Both turbos work independently at the same time. Most twin-turbos on the market are this type.In a parallel setup, two turbochargers of the same size work simultaneously, each handling half of the engine’s cylinders. This design is often used in V6 or V8 engines, reducing the load on each turbo and improving response speed.
To reduce the turbo lag, some manufacturers opt for sequential twin-turbo. At low engine speed, all the limited amount of exhaust gas is directed to drive one of the turbos which is smaller, leaving another bigger one idle. Therefore the first turbo can spool up more quickly. When the exhaust flow reaches sufficient amount to drive both turbos, the second turbo intervenes and helps reaching the maximum boost pressure. The switchover is implemented by a bypass valve, which is controlled by engine management system.
Twin-turbochargers are widely used in high-performance cars, luxury vehicles, and diesel engines. Examples include BMW M series, Porsche 911 Turbo, and Mercedes-AMG models. These systems are particularly effective in multi-cylinder engines, where they can distribute the workload more efficiently.
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Post time: Apr-18-2025