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I think the reason is the same?
It can only build pressure when the TB's are closed and the BOV isn't opened?
It's not the supercharger itself that causes a sudden spike in pressure or boost, it's the fact that the air can't escape so it piles up. And that can only happen when the TB's restrict flow.
So I don't think the revlimiter causes the spike, it's the fact that you (maybe subconciously) lift the throttle. I think the revlimiter only cuts fuel/ignition and not controls the TB's.
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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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