I dont know what I am battling at this point. If I stomp to WOT and get past 20psi the boost just stops. The RPMs stay but there is no power because the boost is gone. If feels like when I was stock and hit fuel cutoff. If I let off the gas and get back into it boost comes on again strong. Its like there is a limiter or something. I can gradually bring it up ok but cant stab it. I was running an ARD TCV then went to a HKS EVC and still have the same issue. MBC test is next(edit:can see by the video its not the problem). On the intake side I have swapped out the HKS BOV which definately made a difference in holding boost but once I hit that 20psi...boom, gone. I dont know if its fuel being shut off, my AFRs are 11.9 on boost, when the boost falls it goes to 13.4 but that is expected in the situation I guess???. I cant think of anything else causing it other than the BOV is releasing but I purposely put that stupid whistle nozzle on it so I could hear if that was going on....not a peep. So if its not the wastegate releasing or the BOV releasing then it seems to me that it would be fuel shutting off (255 walbro and greens). So what would trigger that?
Here is a video of the wastegate in action. Realized I slammed my glasses in the hood at 1:10, Boost fail at 1:55 and 2:30
So, looks like the wastegate is not opening and the BOV is not opening. What could it be? Could the ECU back off timing?
Here is in the cabin. Sorry the sun is out and hard to see the tach. The boost gauge is a 20psi gauge to give you an idea of where the needle should go.