Thread: twin turbo
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Old 06-15-2000, 07:07 AM   #9
Scooby Newbie
Member#: 566
Join Date: Nov 1999
Location: Sussex, UK
1994 Legacy GTB



With a sequential twin turbo setup, you don't always have the exhaust flowing through both turbos, on the legacy a valve closes off the second turbo until over 4500rpm, this means that a small turbo thatcan build boost from under 2000rpm gets all the exhaust flow, and that a larger turbo for high flow and revs can be brought in later.

If you use a single turbo that produces lots of boost at 7000rpm you won't get much boost below 4000rpm

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