The pressure wave... - Saab 900 Bulletin Board - Saabnet.com
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When you're under boost and let up, the pressure build up has no where to go. So the sudden increase in vacuum opens the BPV which dumps this excess air pressure back into the airflow before the turbo (but after the AMM)
If the BPV stays shut, the sudden back pressure disrupts the air flow and starves the engine of air.
_______________________________________
Ken
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