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So now that we agree on the pop-off valve, and the bypass valve, and the difference in a bypass valve and a blow off valve, you mention that you have a bpv.
Is that why you don't stumble?
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a "BPV" is the exact same thing as a "BOV," the BPV is routed back into the intake stream and the BOV is vented to atmosphere. it's the exact same part, mechanically. i turned the stock BPV into a BOV just by disconnecting the hose that would send the vented air back into the intake.
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Just because you have had 2 cars that didn't have problems, it doesn't mean you have solved the issue and that everyone else is making stuff up. 2 cars = 2 data points, which is not enough to pull a firm conclusion.
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1) Porsche 944 turbo (dad)
2) 2G Eclipse GS-T (friend)
3) SR S14 (friend)
4) SR S13 (friend)
5) FD3S (friend)
6) FC3S (friend)
7) S14 KA-T (friend)
8) MkII MR2 turbo (friend)
9) Porsche 930 turbo (PCA member, acquaintance)
as well as numerous people on numerous forums...
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All stock turbo euro cars be they crapwagons (Sorry! I hate em, no offense intended) or porshes are boost controlled from the ECU. Our cars whether they be ka-t or SR's the ECU has no idea there's a turbo in there. It only reads mafs voltage. In that sense i think it's safe to assume that your porshe ECU has sometype of algorithm to compansate for lost air during shifts.
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no. read what i've said. the stock setup has the BOV/BPV routed back into the intake behind the MAFS and before the turbo inlet, thus the ECU doesn't expect anything other than what it sees at the MAFS. and the ECU (fuel, timing) is a separate computer from the TCU (and don't forget, this is 1986 electronics we're talking about). there is no "algorithm to detect lost air."
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I think a big reason that the 240's see a stumble with a BOV more htan the porshe is that the porshe most likely has a 1.1 afpr.. where as ace in the hole recomends a 10.1 which means A HELL OF A LOT MORE FUEL when the car is goin into a rich state...
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there really isn't that much of a difference in fuel pressure and injector flow...