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From what I understand you will never see the 200 psi at 15-1600 rpm. What we don't know is how much performance gain when we drop one lower button size and change full rail pressure. You might have gotten the same amount of power / performance with a 20 button and 185 total rail pressure...

I never put a turbo on any of mine. Just found this thread and post #9 talks about plugging a hole in the head if we add a turbo. https://www.steelsoldiers.com/showthread.php?79077-More-Power-From-NHC-250-in-M939-Series-Trucks-With-Allison-Transmissions&highlight=button

My .02 without more up grades #17 button and 200 rail plus your 900* your looking good. Seem like it is a rabbit chase to gain just that little more. With bigger injectors to eat the higher rail pressure then more heat so then after cooler then something else to keep EGT's down. I do not believe...

I had thought that the button would increase rail pressure from idle to mid rpm range. So if we add a turbo then running the stock PT we decrease the button to get higher pressure from the get go. Now if you added a PT that had a AF screw you could run the AF screw to allow more fuel from the...