MAF Scaling

Good morning gents,

I have a 2006 LBZ that I put a 4" intake on. The truck was already tuned (not by me) and after the intake install it seems like I have more black smoke than I did before when laying on the throttle. I am curious if I need to rescale the MAF and if so, how do I do that?

One other thing, when I installed the intake, I put on another set of tunes at the same time. This may also be my problem, but I want to be sure that I am set up correctly on the MAF side of things. Even if I do go back to the other set of tunes, I am pretty sure I will need to rescale the MAF anyway since that was setup for a stock airbox.

Thanks!

Here is a log I did. It is my understanding that the MAF reading should be around 39 g/s at idle. I am at 59 g/s at idle.

A little confused. You are correct that your MAF is reading too high. But is that with the stock MAF-voltage table? Or one provided in custom tuning?

You would get overfueling during acceleration attempts with a MAF reading that is too high. If using the stock table now, reduce all the MAF values by 25%. Here is the stock table B0201

Attachment 24995

Hey thanks for the reply!
That log is with custom tuning, it is NOT tuned for the larger intake.
Interestingly, the custom tuning (both different files I have) have higher than stock values for the MAF table. I will replace those with the stock values and then drop it by 25%.

Over the weekend I did actually end up bringing it down quite a bit and I got my readings pretty close, averaging at 42 g/s at warm idle. I was running from a rain storm so I quit tuning it.

The intake I am using is a WCFab 4" intake just as a piece of information.