lb7 WILL NOT COMMAND MORE THEN 22K RAIL PRESSURE

we have a customer vehicle a duramax lb7 that will not command more then 22k of rail pressure. and just feels sluggish and kinda blah!!!!!!!!!! cant figure it out and dont think its in the tune tried lots of different known good tunes. any suggestions would be great.. no i cant share the tune because tuner has it locked down. i do have a data log if that helps

Post a data log. Make sure you have good PIDS for performance. See below

Pedal

RPM

VSS

Fuel Mainrate mm3

FRP des

FRP Act

Main pulsewidth in uS

MAF flow rate

Boost

FRPACOM (which is regulator performance)

Nick