[DeepRoots]

i don't know much about 466's. I work on 2stroke emd and detroit diesels, but I think basic diesel engine knowledge would tell us boost loss is either one of two things.

1. exhaust or boost piping leaks. check for black soot anywhere near the exhaust piping up to the turbo, I would think you could hear the ticking tho. try your best to find air leaks on the pressure side of the turbo. With someone revving the engine, you should be able to feel any air losses, and possibly hear the whistle of excaping air.

2. Not enough fuel. Without the amount of fuel, you cannot make boost. I don't know how you can check the injectors on that engine without pulling them. On 2strokes I'd check the individual exhaust manifolds with an Infrared gun. Comparing temperatures will tell you if injectors or valves are not set properly/misfiring. dt466's have injection pumps too yes? I don't know how you could test it without pulling it.

I would figure on fueling issues, if it was just air, I would think you'd notice the increased cloud of smoke.