Ok, my next challenge. 6v92TA 350HP DDEC2. Previous owner stated that he could peg the boost guage near 30lbs. I never get over 21. I have removed muffler and gone straight 5", checked all intake hoses, etc. Even went to far as to spray light starting fluid near intake hoses to see if there was a leak. So I am stumped. I have had the turbo out and it spins freely and all fins are intact. Why would I not be getting more boost?
"Boost" is directly related to the amount of "load" you are putting on the engine at any given time.
Here's an example - driving at 60 mph on a flat smooth road - not really much of a load on the engine - boost will be low.Now driving up a steep incline, trying to maintain 60 mph, this situation puts a larger load on the engine,requiring more turbo boost to make power.
Where was he driving when he claims to have 30lbs of boost?
How's your fuel filters and fuel pressure?
Hope this may help. 8)
Did he also tell you he was getting 15 MPG?