Another_User

Here is the screenshot. My guess is that it is caused by the ported MAF sometimes being unable to accurately judge airflow at low airflows and less air shows up that it actually reads. It does not happen when I run MAFless. It's kind of annoying because even on long trips my LTFT averages are between 1 and -2 across the board, with the slightly higher numbers up in the decel areas, and the lowest low numbers being on the far left. Also notice that the STFT scale is from -50 to 50, no -25 to 25 like the default is. Any thoughts?

99whitews6

iTrader: (2)

Why do the O2's platuea at this point? Im sure you know why, its just something I noticed. The fuel trims linearly drop off with the platuea of the O2's. Just fishing here.

P Mack

iTrader: (6)

It's cause you have a 98

horist

COT is disabled right?

Another_User

I think it is just a point where the MAF reports the wrong airflow...I tested dropping the VE in that area (-20%) and it had no affect. I know it doesn't happen MAFless, and I am 99.9% sure after looking at my logs that it did not occur when I put the MAF back in and was running a screen. It appears to be something I can't work around...

Can anybody out there with a ported MAF verify this for me?

Very funny. I actually explored that possibility. That does not appear to be it.

Of course. I even just double-checked, just to be sure. It is definitely off.

P Mack

iTrader: (6)

Does it only happen on acceleration?

Another_User

It appears to happen at low airflows while cruising, sometimes at idle (after a hot start...very weird), and during some very light acceleration. I think it is during "steady state", if you are familiar with HPTuners dynamic airflow terms. I can't really be sure because that crap is so complicated (I could probably figure out how to build a ground-to-air missile before I got all those calculations figured out), but it usually appears that the requirements are met. I think that it just happens at times that the MAF is weighted in as the main source for the airflow calculations AND the airflow seen by the MAF is incorrect because it is ported. Totally sucks...

Another_User

I just realized that I never noticed this issue before my AIR delete. Could this be some weird byproduct of the AIR delete? It only seems to happen for the first few minutes of my drive (most drives around town are short anyways).