tashspop

so i'm trying to dial in my maf and I noticed while loging at times I seem to be really close and others i'm rich, and then again others i'm lean. been battleing this for some time now but I think I found a pattern.

it appears that below 110f I am close-rich on my adjustments, 111-149f I am lean, and 150f+ I am rich. I do not know if I can adjust something somewhere to fix this or turn off another setting for my tuning file to get accurate data or what.

this is in a truck so iat should be located in maf.

1slowbusa

iTrader: (8)

Why are the LTFT off? How are you trying to dial in your MAF? Where are you located?

tashspop

both the stft and ltft are off, along with cat temp protection, and defco. i eliminated all trims just like if i'm tuning my ve table and i'm compairing my maf to my wideband error to make adjustments to the maf table. settings are to ensure i'm in openloop.

i'm located in texas. temp the day of this log was about 86f, i'm getting heat soak and assuming that the computer is pulling back fuel thinking the air is less dense do to the temperature it sees on the IAT sensor. during normal operation in closed loop, i'm guessing the NB o2's keep my fueling in check during this event.


as of right now, i'm assuming that the afr's i read while my IAT is below 110f are correct un-trimmed and the sudden change i see above that temp is useless data?

tashspop

i believe i found my way around this. i'm using two filters in my histogram.

[sens.11]<38 and [sens.30]>55

this gives me IAT logs only under 100*f (sens.11)
and
map value (sens.30) only above 55 to help weed out throttle lifts and light engine load.

1slowbusa

iTrader: (8)

Oh, ok, you are using the wideband instead of the LTFT.