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I think he means blowoff valve (or better: compressor bypass valve).
A wastegate technically limits the propulsion (turbo engines terminology)
I wonder if this idea is also used commercially (I mean in mass produced engines). There are not that many engines fitted stock with centrifugal superchargers I think.
But I like the idea to better use the centrifugal compressors' bandwith.
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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