1ORANGEWS6

I have mine set to be lean right now about 14-16 and at WOT 12.8-13. Is my part throttle A/F to lean?

ZL1Killa

iTrader: (17)

your car should have a built in standard of 14.7 or 15 something maybe higher :1 standard. you are fine...check for metal parts in your oil next oil change and check your spark plugs. my WOT is running at 13.5:1 down to 12.4:1 which i want to get it all around about 13.5:1 down to 13.0

1ORANGEWS6

Mine actually drops to 12.7 then goes to 13 at WOT. My part throttle is actually 14.5-16, I thought that might be a little lean though. I planning on spraying my 100 shot here shortly and I want it at about 12 at WOT.

ZL1Killa

iTrader: (17)

what did you change to get it to drop to 13 @ WOT...what tables and such with tuning? I have efi live

12secSS

iTrader: (30)

Part throttle cruising should be handled by your O2s and the fuel trims should range from -4 to +4. 14.7 is the "ideal" mixture for emissions and economy part throttle driving.

1ORANGEWS6

I used a O2 wide band and scaled my changed my VE tables but if you don't have a wide band you can just tune your Ltrims like stated above.

APeteSS

As per gov't mandate, any part-throttle operation (short of PE, of course) must produce an A/F of 14.64:1.

Question, if an A/F log of part-throttle closed loop driving looks like a sin wave (ranging from 14.5:1 to about 15.2:1) is a sensor going bad?

02sierraz71_5.3

iTrader: (2)

Ive heard of people commanding 13:1 at part throttle but unless you have a wide band there is no way to tell what its other than rich or lean as compared to stoich.
I have noticed that when I fatten it up at part throttle I can run more timing and have more power but mpg is go down of course.

1ORANGEWS6

Just incase I didn't mention this, I have a O2 wide band. Thats how I know what my A/F was. My car at part throttle is running about 15.2-15.5 A/F but I did see a 16 A/F a few times.

chriswtx

iTrader: (5)

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