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JFB

G3/G4 AFR values offset

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I’M a little new at all this tuning stuff, but I understand most aspects.  I want to try and refine my AFR and fuel maps...  But first, I need to resell every an issue with AFR.  I have a wideband gauge in the car, and I compare it to the wideband from the G3/G4 ECU on my computer.  The ECU seems to always be reading 2.0 to 4.0 higher than the wideband gauge.  Is there an adjustment for the reading in the ECU?  How do I get both AFR values to match?  And more importantly, which one is correct?

I have seen other ECU programs where you can set voltages in the ECU software to match the gauge you bought...  I can’T find that in the G4 software...

I’m assuming my gauge is correct, and I’m assuming the gauge is sending a signal to the ECU...

 

Thanks

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if the lambda sensor is wired into the gauge, then it would be the gauge to trust.

how are you connected from the gauge to the ECU? it sounds like a ground offset between the ecu and the lambda.

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I’m not sure. 
 

ill ha e to follow the wires. I didn’t install it myself and it’s been there for over 10 years.

Isnt there a way to set the input voltages for a given AFR in the G4 software? Like a calibration setting in the G4 program?

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9 hours ago, JFB said:

Isnt there a way to set the input voltages for a given AFR in the G4 software? Like a calibration setting in the G4 program?

Yes you can do a custom cal or there are some built-in calibrations for various 3rd party options.  What wideband device do you have?

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Hi Adam,

Thanks for replying...  I have figured out my issue this morning.  I have an Autometer 5978.  Turns out the values on the gauge were set at 0V-4V -> 10-16 AFR.  And the values in my CAL table in the ECU were set to 0V-5V -> 10-22 AFR.  I set the gauge to 10-20 AFR and did the same on the ECU CAL table.  I also changed the volts from 5V to 4V in the CAL table.  This fixed the issue.  I am now within 0.1-0.2 AFR gauge to ECU.

Thanks forum!!!

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