So the other day I took a log on my 2000 s4. I have bosh 52lb injectors (working on dialing them in) and a vast 90?mm maf housing. Im running original K03 turbos with no cats and coded out rear o2 sensors. My wideband is a zeitronix unit. I am running the schnell-mbox stg2++ file with altered tables for maf size and injector scaling. My log started at ~1500 rpm and only goes to ~3800 at which point the car cuts out. I believe this has something to do with my fueling... regardless, I was using ecuxplot to graph my logs of zeitronix and nyet's me7logger. I compared the two using a filter that starts at 1500 rpm and requires the run to be at least 2000 rpm long as i was not planning on going all the way to 7000 rpm yet. I have the x axis set as rpm and the y axis set as zeitronix wideband and y axis 2 set as requested air fuel ratio (afr).

I am curious if I have set my graph up correctly to view what I need to compare the air fuel ratios. Mostly I am wondering why my requested (purple line) starts at 21 and goes down to 12.2 while the actual (zeitronix red line) hangs around 13.5 and then 14 at 3k rpm then down to 12.2 by 3500 rpm and then up a little and back down a little between 3500 and 3750.

Without looking at the log or even thoroughly reading your post, I would suggest throwing the stock MAF back in and getting the injector calibration dialed in first. Once you are satisfied with that, then move onto the MAF.

BTW don't even bother doing a pull until you get your idle fueling right.

STFT < 2 right after a LTFT reset.

as far as i know idle fueling is correct. what would tell me different?


this is a great idea and that will be something i do with my next flash. i will just have to find a stock hitachi maf table and put my sensor back in the stock intake.


i did not notice that. is there anyway i can make the scale on the right match the scale on the left?

LTFT, STFT.

The fact that your actual isn't anywhere near your requested tells me your idle fueling probably isn't right either...

you have two y axis, one on the left and one on the right. each axis can have a different scale, and they autoscale to the min/max value of the data.

if you put things you want to compare on different y axis, they'll be different scales, and you can't compare them.

why would you want that?

put both afrs in y axis 1 or both in y axis 2

So today I installed my stock maf and changed my maf table back to stock. Here is an ecuxplot graph of my current run. I am trying to dial in my fuel injectors first but not really sure where to start so if someone could chime in that would be great. Do I need to change my krkte? tvub? and how can i figure it out? Thanks again everyone for your patience and help as I am still learning.