Ok, first off, I just have to say that I've never ridden in such a fast deisel! OMG! It could burn the tires from the 1-2 shift...and they're 35" tires! It's amazing what 23psi of boost and 5" exhaust can do!
Anyway, my buddy seems to have some wastegate fluttering in 3rd and 4th gear around 2200 RPM or so. You can hear a kind of "pfft pfft pfft" and the boost is at about 18 psi. Then, after a certain RPM the boost hits 23psi and no more fluttering. Any idea what's wrong? Any idea how to correct this?
