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Since that one is now circulating with the top and bottom port of the external gate, maybe the boost reference line looses pressure when waste-gate kicks in(?).
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That's possible but if your FP is decreasing at 1.3 bar and you were hoping for 1.6 then I am assuming that you have your EBC set above 1.3 bar correct? So it would only steal pressure when the WG opens and not before?
Also, you didn't have this problem before at higher boost levels.Maybe your alternator is too weak to support the increased load that the pump and injectors are demanding? Just an idea, but I think the problem is actually elsewhere.Does your ECU control the fuel pump also? Is it possible that you may need a larger or an additional feed pump?