Fourdoor

iTrader: (11)

Hey guys, (Tephra specifically)

ROM ID 55590006

I am running E-85 and would like to lean out my idle and cruise A/F ratio's for improved fuel economy. I could do this by changing my injector scaling a bunch more, so my STFT and LTFT's were maxed out and unable to change fueling... but a more elegant solution would be to change the voltage offset of the front O2 sensor by a small amount. This would lean out (or richen, depending on value entered) the fuel delivery any time the car is in closed loop operation, but it would still be able to compensate for weather changes etc with the fuel trims.

If anyone can figure this one out, much appreciated!

Keith

stokEd

iTrader: (3)

Can this not be accomplished by tweaking the fuel maps?

tephra

iTrader: (6)

yeah but you would need to run openloop full time to get the same affect - which probably isn't advisable...

after thinking about this, I dont think you will be able to do what you want WITHOUT replacing the narrowband with a wideband.

mainly because the narrowband only detects stoich - so once you apply the offset it will run lean/rich and the narrowband will say that rather than stoich...

its a bit confusing, but I dont think it will work...

Fourdoor

iTrader: (11)

If you can give me the code I will test it out and let you know if it works or not.

Keith

Golden

iTrader: (1)

It would be interesting to run a WB and a value outside of stoich. I think better economy would be had around 15.2 afr, plus I would like to have my WB not jump around so much in open loop. I'll have to try this some day.

criptballer

iTrader: (3)

i accomplished leaning out my idle by dialing in my LTFT as close to 0 as possible and then my car goes into open loop after my STFT are at 0. so i have my idle at 15.3

stokEd

iTrader: (3)

Understood, thanks.