Gas engine and Diesel of same specs.Pull the same.

Unburnt diesel comes out as a blueish/white smoke, not black. Ever remember walling out in the morning after starting the ole 7.3 and thinking, "man it got foggy all of a sudden"? LOL! The black smoke is actually burnt fuel just not burnt clean. You can clean it up with more air but you will have to get a bigger wheel and then it's hard to get the turbo spooled up. That's usually what takes them so long to get going at the track, getting it spooled up.