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It is compressor surge. Without the valve opening you are getting 0 flow at high pressure levels, which is always past the surge line. Surge can, and does, occur under vacuum.
Even with it being crushed somewhat, it shouldn't do that. What boost levels did you try it at?
BoostFrenzy, it's that the amount of vacuum trying to overcome the spring tension is less, so less spring tension is needed to get a decent blow off point.
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Tom - '90 Talon
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