Cummins ntc 475

The MVT system has been removed which is a good thing.

 

MVT is built into the cam follower, it moves the followers towards or away from the center line of the engine, it would run in advanced mode until fuel pressure increased high enough for it to shift into retard mode while working.

The advanced mode was purely to control low idle smoke, if it no longer has it I am sure it smokes at an idle just due with how the timing is set, or should be set with the 475 cam.

While most think those engines are neat the small turbo in the compound setup is really too small for the HP that those engines were running and they were more prone to have head gaskets issues, later engines make more power with just a single turbo.

Manifolds are notorious for cracking the center divider due to excess heat, another reason they aren't real common to see them still running as cummins no longer makes the manifold nor do any aftermarket companies.

500hp can be done with minimal pump work, but its likely the pump isn't stock by no anyways.

 

Easiest route would be to go to a single turbo, that is the easiest and simplest.

 

Depending on the HP you are shooting for, I would suggest using a Holset 3804502, this is the turbo that the 525hp N14 uses.