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Posted by BlackholeZ on November 06, 2017 at 11:43 AM
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In Reply To Sure. The Borg Warner EFRs have an efficient wastegate. posted by MixManMash on November 05, 2017 at 06:38 PM
     
Message And that's part of what I was meaning with moderate vs extreme builds. Internal wastegates are adequate in the low 20psi ranges that a lot of us run. I used to work on a lot of DSMs and internal wastegate troubles and boost creep were always an issue because they were pushing 35+ psi. Also with these more efficient turbos we're able to run more lb/min at lower boost pressures, which lessens the need for an external wastegate. Still, if you're going for a wild build, a wild setup will be needed to do it right.
As always, packaging is the main issue on our car, and the main reason external wastegates aren't a more common option. It'll be interesting to see if these turbos make that more of an option. If Garrett is to believed, the 660 would be a 1200BHP pair of turbos for us. Definitely something worth spending some R&D time. I can tell you if I had a bigger garage and weren't still in school I'd be working on prototyping a pair of manifolds for a mirrored v-band setup.

-Dan


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