I'm wondering for those running 15 psi do you have boost drop steadly as RPM's increase. I'm seeing around a 1.5 psi drop. Not sure whether this is due to my blow off valve, some leak or the twins won't hold that pressure. Let me know thanks.

 

Do you have a PFC log of the boost dropping off? I see a similar thing even at lower pressure. In my case it seems to be related to the closed loop control of boost by the powerfc. Once the difference between the target and measured pressure is "small", the powerfc doesn't do much correction. You might also take a log of Precontrol and Wastegate duty cycles. This would at least tell you if the powerfc is trying to raise the boost, but is unable to due to one of the reasons you mentioned.

 

Sorry, I should have given my setup. I'm full non-sequential and running a Blitz EBC. I have done plots of my boost and it will hit 15psi and drop as rpms climb.