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Originally Posted by drftk1d
the advantage in parallel twin turbos is not that they spool faster, but can use both to create more boost vs a single. give me more time to think about why that is and i'll get back to you, okay?
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Smaller turbo's have less weight to move so easer to spin, the same reason we use lighter flywheels, lighter crank pulleys, lighter anything thats in motion. It takes less power to accellerate or put in motion. The size of the compressor and how fast it spins within it's envelop determines how much boost you'll create.