Have you ever wondered how a parallel-twin-turbo engine is designed? Are you curious to know the concept behind this engine? If you are keen to know more about this engine then you should surely read this discussion further.
Parallel twin-turbo is a type of turbocharger configuration where two same turbochargers work simultaneously. They equally split the duties of turbocharging. Each of the turbocharger gets driven using half the used exhaust energy of engine.
In most of the applications, compressed air coming from the two turbos is collected at the single intake manifold for them and then sent to individual cylinders. Generally each turbocharger mounts to its individual turbo or exhaust manifold. You should note that in the inline type engines the two turbochargers could be mounted to one turbo manifold.
The parallel twin turbos find great application in the V-shape engines. Here they are generally mounted with each bank having one turbo. This gives packaging symmetry as well as simplifies plumbing over one turbo setup.
Inline engines using parallel twin turbos commonly apply two small turbos. This helps in getting similar performance at lesser turbo lag as compared to one large turbo. Few examples of the inline parallel twin-turbo engines are BMW’s N54, Nissan’s RB26DETT and Volvo’s B6294T.
Few examples of the V engines using parallel twin-turbos are Mitsubishi’s 6A12TT, Nissan’s VG30DETT, Audi’s 2003-2004 RS6 and 1997-2005 A6 etc.
Theoretically the set-up of parallel twin-turbo gives lesser turbo lag as compared to the set up of single turbocharger. But, practically it is not true all time.
