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Originally posted by MaFi0s0
i was reading up on twin turbos to figure out the point of having 2 turbos, i read that there is a low end turbo and a top end turbo, one that kicks in at low speeds, and the bigger one takes over at higher speeds, but did they mean higher engine revs or higher speed?
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As SaabJohan said, that's only one type of twin turbo system. It's called a twin sequential turbo setup, and yes the higher speed means higher engine RPM. One small turbo that spools up quickly and provides good low RPM flow, and one larger one that provides the necessary airflow for high RPM boost. The Supra twin turbo is a good example of this type of system.
The other primary reason people use twin turbos instead of a single turbo is for packaging reasons. Larger V bank motors and some flat motors are easier to turbocharge if you have one turbo per cylinder bank, otherwise exhaust routing and length becomes an challenging issue in terms of heat management and performance. Such as system is called a parallel twin turbo setup, where each turbo is identical and the two work together to provide airflow and boost.