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Old 10-30-2011, 11:46 PM   #1
kleedzine
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Member#: 273531
Join Date: Feb 2011
Chapter/Region: E. Canada
Location: Toronto, Canada
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02 frankenSTI
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Default Target Afr setting

I am trying to set target afr to 11.5

first, I logged 3rd gear pull and I get 11.1 afr. while pulling.
So I have set the open loop fueling table.

@ 2.9~3.1 engine load
11.2ish at peak torque range(3.2k~3.6k rpm) 11.5 to the redline (6.5k)

And I logged 3rd gear pull and got only 11.14 afr.

I am using Accesstuner race.

Can anyone tell me what to do? to set the target AFR?
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Old 10-30-2011, 11:56 PM   #2
sorrowfulkiller
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Easiest way? Set your target afr's in the open loop fueling map to whatever you want them to be. Change afr in the software to lambda, change your wideband to lambda.

Datalog and make sure you are datalogging commanded fuel, actual fueling and rpm as well as the maf load.

From there use maf load and rpm to determine where you need to adjust your fueling.





So for instance your commanded fuel is .81 lambda and you are at .79 lamda, multiply that cell by 1.02 which will add 2% of fuel to that cell. Which should get to to your desired afr. If your commanded fueling is .81 and you're at .89 multiply by .92 which will take out 8%. Get it?
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Old 10-31-2011, 12:19 AM   #3
Airboy
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Are you logging wideband O2 or the factory O2 sensor? Factory O2 will read 11.1 for anything below about 12:1
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Old 10-31-2011, 01:27 PM   #4
kleedzine
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Thanks for the input.
It is from AP dataloging, and it is from factory O2 sensor.
I think I should get a wideband first to tune AFR.
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Old 11-03-2011, 04:36 PM   #5
Phatron
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^ Correct, you need a wideband. The stock front 02 sensor will just peg at 11.14. This is not the real AFR reading, just a limitation of the stock sensor. And just like airboy said, it wont "unstick" from 11.14 until you get up into the 12:1 range.
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