Here are few of the final pulls. This was 9psi. The ID1050x injectors were maxing out, and this is where I wanted to stop anyways (400whp/300wtq). Shawn thought the graph could be smoother, and he thought the injectors could do more, but we were chasing a shifting problem. It seemed like boost was cutting out. Maybe a boost leak, and I had on my list to replace two of the o-rings that seemed smaller than ideal, but after looking at things, he says the problem is the fuel pressure. He says it is dropping, which is common in a returnless fuel system without a boost reference pressure regulator.
I believe the manual says the stock fuel system has a pressure around 51-73psi with a fail safe or something of 58psi. After removing the stock fuel pump controller, the pressure seems to stay at 60psi. Well, it was a good thing I got the fuel pressure sensor because the system was detecting lower fuel pressure and adjusting the duty cycle on the injectors or something like that. He says the pressure was dropping into the 40's or something, so a return, referenced system would be advisable for more power. As you can see from the graphs above, it can be decently smooth, but it seems to be fighting to adjust things when fuel pressure drops. At least, that is what I am understanding.
I'll look into the fueling setup. I know @
visbits and others have switched to a return system, but I am not really wanting more power at the moment, and the tune is safe and fine for now, I am told. Overall, I am pretty stoked the car made what it made at only 9psi on a relatively small turbo with plenty of future overhead for more power if I want. Car feels smooth and strong.