TLDR: truck had ?mystery? tune on it, pulled tune and the only parameters changed were fueling parameters. Is this a legitimate, safe way of doing a lower HP tune?
Longer story.. my friend bought an 06 Cummins that smokes fairly heavily and seems to have good power. Definitely more smoke/power than stock. The older gentleman my friend bought it from said it had a tune but wasn?t sure of the details so I hooked up my computer and pulled the tune. I don?t do diesel tuning but from what I?ve read, standard procedure seems to be adjusting fuel and timing. That being said, I?m confused as to why only the fueling parameters have been modified. My theories are 1. HP tuners didn?t properly read the file or 2. It was some kind of canned tune from a handheld programmer and this is an easier/safer/more consistent way to make power without knowing specific details of any given truck.
A few other parameters were changed like some torque management settings and stuff like that.
I can post the file later today if necessary.