Thread: Negative LTFT and resettting trims.

Not to nit-pick here but 950mv would be really rich, 900-920ish is normally around target afr from what I've always seen. Of course I used a wideband to make sure I was where I needed to be but never saw above .940mv even at 10.8 afr.

And as stated front o2 sensor must swing back and forth, it's ALWAYS trying to achive stoich during normal throttle operations.

Originally Posted by Fivefingerdeathpunch

Not to nit-pick here but 950mv would be really rich, 900-920ish is normally around target afr from what I've always seen. Of course I used a wideband to make sure I was where I needed to be but never saw above .940mv even at 10.8 afr.

And as stated front o2 sensor must swing back and forth, it's ALWAYS trying to achive stoich during normal throttle operations.

it depends on the car/sensor actually. before i got my wideband i used the narrow's at 940-950 and it was about 11.2 in my car. they are tunreliable. basically shouldnt be tuning off them but live and learn. get a wideband...pay to play.

FWIW my buddy's car was more like yours around 920-930 to get to 11.0 to 1. thats why i dont use them anymore.