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Niner11
The voltage of the stock sensor is around 500 mv at lambda, not 1 volt, which is near full rich. The slope of the voltage of the stock sensor is so steep, it's really just a switch to dither the duty cycle of the FV back and forth around stoich for the sensor.
If your goal really is "the price of gas" you are out in left field with a 13.1 AFR. You should plug in the stock lambda ECU and not be so anal about the idle. The idle mixture is irrelevent outside of emissions, you want to focus on the AFR at WOT under load. The advantage of a wideband controller comes in when you defeat the stock open loop throttle switch and use the wideband to adjust the WOT mixture to 12.5-13 AFR for best power. To improve mileage, you first need to remove the cat, then tune for 15.5-16.5 AFR under light cruise load with around 40 BTDC ignition timing. Use the wideband to determine your cruise AFR and adjust the FV duty cycle to come to your target. Best lean cruise economy occurs way beyond the range needed to feed the cat. GM did this on early closed loop EFI systems, but abandoned it for emissions and warrantee.
Paul
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Paul
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