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Originally Posted by Y-TRY
You're a plethora of info, Jason. Thanks.
It's the "centrifugal-style BYPASS valve" I speak of. I understand that these leave the intake plumbing open under most every condition but WOT. But I think you answered the question. I'm guessing the boost map is different between the super- and turbo-charged compressors, and that type of valve is used to address a specific characteristic found in the super-charged applications only. Right?
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Yes, this would be a supercharger only type bypass valve. The supercharger will make boost based off of RPM alone. A turbo is only going to make boost when it is needed.
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Originally Posted by Y-TRY
Also- I was thinking, in my ignorance, that wastegates are either fully open or fully closed. Is this the case, or are they "smarter" than that? Do they open partially under certain loads, or boost signals, or do they suddenly pop open and closed at the given time?
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They are somewhat smarter than that. They will open partially when running higher boost levels. Back pressure & spool charcteristics have a big effect on how quickly they open.