Getting ready to change doser at the turbo

[JimT]

My 2250 runs between 18-20 psi at idle (720rpm) and about 36-38 or so at about 1500-1600. These numbers are based on the needle in the dash, not an actual reading from insite, so my reading of them could be slightly off. Oh and thats only after the engine temp reaches 185F. At cold start it idles at about 40psi and slowly drops as the temp rises. If I don't let the engine get up to at least 150F before driving I could see the pressure get up to 60psi (that's with gear oil added) at 1500 or so. I let that happen once after first adding the gear oil, never again. Even 1100 rpm fast idle on a cold start can push the pressure over 50psi until it starts to warm up.

As for the warning about gear oil, was more of an fyi for the future when you start burnin more oil and the dpf/doc are also getting old and worn out. Makes for the perfect combination to have constant regens/dpf issues. Too much ash will clog up the internal passages in the DPF and any moisture that makes its way in there could turn the ash into mud. Eventually it causes too much restriction in air flow and the only way (that i'm aware of) to fix it is to drop the cans and get them cleaned, baked/de-ashed/flow tested.

As for cleaning the rest of the intake system, yes, do it as soon as you have time. You shouldn't need to go all the way to the CAC. just from the crossover tube to the intake.