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Eric86Red911 Eric86Red911 is offline
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Join Date: Jan 2003
Location: Chicago, IL
Posts: 177
The only advantage to an internal wastegate is that it's cheap, and *maybe* easier to plumb.

But it's undesireable because it causes a lot of flow resistance due to all the post-turbine turbulence. So if you want big power & efficiency, you want an external WG. Ideally you want the WG to dump to atmosphere (which is pretty darn easy to plumb!) but OEMs can't design that way for emissions reasons. For emissions, you'd route the WG outlet it back into the exhaust stream, preferably at least 1+ foot downstream.

So there's little controversy; external is better.

...at least that's what the experts tell me...
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Last edited by Eric86Red911; 02-13-2008 at 12:46 PM..
Old 02-13-2008, 12:44 PM
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