Sounds like a air leak...
I was running those numbers before I even swapped intake filters.
Check to be sure your throttle is opening ALL the way...Mine wasn't when I started
'playing' with it. At that time I could only get ~ 12 psi..Once I adjusted up the throttle linkage I was hitting ~ 18 psi from stop.
i had a 21cm and i could hit 22psi with a turn on the full power screw, check your intercooler pipe boots, all the connections of your boost gauge, and possibly pressurize your intercooler to check for leaks
On my big 3406 cat I just found the whole bottom of my intercooler is busted off. That leaks plenty. Get a 3 inch Furnco, or 4 inch, what ever size your turbo intake is from a hardware store and a big schedule 40 plug for the end. Drill the plug and thread a piece of 1/4 pipe in to it. I then put a air regulator off from a paint gun on it. Take off your intake from your turbo and slide on the furnco. Add air ( only 15 pounds ) and check for leaks. Hot soapy water in a windex bottle works good. Look for bubbles.
I bet the I/C is bad. Was that truck originally from NY? If so, the I/C is rotted out.
I had 16 psi of boost with a 16cm housing. I didn't think anything of it until I hooked up the trailer and pulled the tractor on it. The EGT's went thru the roof! I knew what the problem was instantly. :CRY:
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