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Twin scroll vs twin turbo

Twin scroll means a divided turbine inlet, but only one turbine. Twin scroll takes advantage of cylinder firing order and helps spool a turbo faster. Given the same turbo specs,

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Old 10-07-2012, 01:52 PM   #2 (permalink)
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Twin scroll means a divided turbine inlet, but only one turbine. Twin scroll takes advantage of cylinder firing order and helps spool a turbo faster. Given the same turbo specs, a twin scroll will typically spool faster than a single inlet. I am not sure, but my guess is that the single inlet would be a bit more efficient up top.

BTW, I believe BMW moved from TT to a single turbo using a twin scroll exhaust housing.
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