Quote:
Originally Posted by luigi90210
could you explain why?
i have always been under the impression that centrifugal superchargers are basically belt driven turbos, so wouldnt anything that applies to a turbo setup apply to a supercharger setup(except for obvious stuff like boost controllers and other turbo specific parts)
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Because the supercharger would restrict airflow and affect idle quality etc.
The turbo can just spin freely in the relative vacuum created by being off boost, so it isn't an issue, the supercharger effectively functions as an air restrictor in a feedback loop... limit air, engine slows down, engine slows down, supercharger spins slower, air is more limited, repeat.
There are ways to compensate around it, but the simplest is to leave the BOV open.
And I refuse to use a different acronym for BOV simply to differentiate between recirc and non-recirc. :P