Originally Posted by
redhardsupra
You're mixing airmass models and fueling correction strategies. Please don't. They don't have anything in common.
When tuned properly, VE and MAF should result in _VERY_ close behavior. I mean to the point where you cannot tell which one you're running without looking at the tune.
When tuned properly, both fuel trims and WB % Error should not have large values. Do not obsess about it either though, having 2-4% errors everywhere is perfectly nice, stock cars/tunes often generate >8% errors. Consistency is more important than how close to 0 you can get. If most of the histogram is 4% off, that speaks volumes about the correctness of the tune, as opposed to having some cells at 0 and others at 12%.