First, I have 6.0 with EGR delete, straight pipe exhaust, ARP studs, SCT tuner with a mild tow tune. Started having problems with overboost under heavy load and at higher rpms when it downshifted. I had to lay off the throttle to keep the boost down. Pulled the turbo and did a clean. There was some scale and build up, and a few of the vanes didn't move all that freely. Got everything cleaned up good, and back on the truck. Now under a heavy load and at 2400-2500 RPM the boost goes up to about 28 psi. I didn't have to back off the throttle to keep it from climbing, but I didn't lay into it more either. The question is what should be the normal max on this turbo? Am I within specs. or do I need to look deeper?

The Ford TSB seems to indicate 30 to 32 psi is not out of range. Don't have everything I need to test the VGT solenoid, but when I pulled it everything was clean, and the cam operated smooth. Comments anyone?

 

IMHO 28 psi boost is just fine. It's definitely not overly high.

 

So would 32 psi as the TSB indicated be to high??? Just did the head gaskets and ARP studs in April, don't want to "test" them if you know what I mean.