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Isn't that spike the result of the throttlebodies closing (during shifting you step off the gas) and that it takes some time to build up vacuum to open the blow off valve?
The supercharger keeps pumping air (because the engine is still running @ high revs) so there is a point that pressure builds up (but that obviously doesn't result in extra power; the TB's are closed)
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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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