No BOOST leaks, still hitting Fuel Cut @ 12psi!?!

[SnowBird]

I fixed all the boost leaks I had, some major, some minor. I still hit fuel cut/backfire at about 12-13 psi. I use to be able to hold 15psi through all the gears all day long.

The only thing thats changed since that set-up is a different block, different 14B (The old one was blown still holding 15lbs), a N/A head w/exhaust gear retarded one tooth, and my FMIC (which has no leaks). My intake mani, and all lines/electronics are the same.

I understand I shouldnt even get a cut until around 20psi on the 14B. Im leaning towards my Maf or something. Oh, and my FP is rewired too. Is there something Im missing?

Any insite is much appreciated, this is annoying as hell.

 

[dsm-onster]

The test is to drop the actuator arm from wastegate flapper arm and see if you still can build boost. If you can, you have a creepy problem .

 

[SnowBird]

Will do.

 

[1992GSX]

When you do that, make sure to post your results. I'm curious to see if you are creeping and what you find out.

 

[SnowBird]

I havent done the WG arm test yet, but I will. I just wanted to say I went for a ride in a buddys car today after I took him for a ride in mine, he intentionally turned up the boost to get his car to cut out, and it was WAAAY more agressive then what my car is doing, mine is almost just more of a backfire, when his fuel cut makes you cringe and wonder if the motor is still together. I plan on keeping the boost low for now and buying a logger in the next couple weeks and then checking it out.

 

[dsm-onster]

I guess I should have asked how violent the breakup is. Sorry. Yea, fuel cut = picking your teeth from the steering wheel