[JGrover]

Its happened last year. Lost some boost. Usually hit 32 psi at 1800/2000 pulling big hills at maybe 1/2 throttle.
Then one day, I have to scream the motor 2500 rpm to get the same boost.Or at 1800 rpm pulling heavy, Was only getting like 24psi boost. Used to get 32 psi. Then truck fixed itself, Thought I had a stuck throttle when the fuel plate started working properly.(That was with the banks plate)Noticed the Banks big head wastegate is set for 42 psi. (Stamped on it)
Now I have the #10 plate. First installed was hitting over 42 psi way to easy.Started cranking down the star wheel, readjusted the wastegate, and opened up the tst boost elbow to get the boost down. It worked, 36 psi maybe 38psi at 3/4 throttle pulling big hills.36 psi@1800 rpm 1100egts pulling 9k boat up big hills. Was very happy.
Now im back to screaming the motor 3000 rpm empty to get only 34psi. Cranked in the boost elbow, and two turns out on the wastegate arm. No change.Pulling my 9k boat up big hills@ 1800 rpm only getting 26 psi boost 1200egt. Does not mater if im at 1/4 throttle or Full throttle. Boost will not go up.It takes mostly RPM to get boost up. At 2000rpm getting 30psi 1300egt 70mph big hills with boat.
This sound like stuck gov arm not moving on fuel plate ramp? Or maybe the starwheel is cranked in to tight? Pushing the airline going into the afc houseing to far, Can that cutoff air flow? Causeing the Gov arm/fuel plate not to work properly? For a mechanical truck, these things can be a pain in the rear Got that Banks Twin Ram Manifold. Makes it impossible to work on the afc houseing without removing the manifold