600 horse 3406E boost pressure

32-34psi,check your wastegate could be opening early.

 

Not sure on the measurements I think its around 22psi before the wastegate moves,Jas, Mr Haney or someone else will know.
Always check the CAC for leaks but I would put money on the waste gate opening early.
Whats your EGTs like??? If you are losing boost they should rise.

 

If its getting to 1100 and its not running hard it will probably top 1200 on a hard pull and thats getting too hot.
Get your wastegate checked at a shop shouldn't cost much also get them to check the CAC.

 

You could try to pinch off the wastegate hose and run it like that and see if you have more boost.
If it makes no difference its not the wastegate.
I wouldn't leave it pinched off though the C16 turbo is weak and you could end up breaking the shaft due to over speeding the turbo.. . . . .IMO

 

27 lbs of boost is considered normal under full load........they can run as high as 31-32 lbs though depending on the wastegate actuator setting

 

the one that i have on my W9 is making around 38 psi running it heavy exhaust never rises above 1100.I would suggest that you check your hoses and your tubes from turbo to CAC and from CAC to intake manifold, during in-frame i replaced turbo, manifold, and all the CAC all the hoses but i still wasn't satisfied with the 27 lbs as soon as i got home i checked the tubes and surely there was a hairline crack on bottom of tube replaced it and the truck has been running smooth since