O2 Experiment 06 Xa Scion - Fuelly Forums

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Old 07-31-2007, 06:02 AM   #1
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Join Date: Jun 2007
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O2 Experiment 06 Xa Scion

Here is an update on my quest to understand how the O2 sensor operates and the possibilities for increasing fuel mileage.
I drive a stock 2006, Scion, Xa, automatic.
I ordered a manual from [URL="www.eagle-research.com"] E.F.I.E. (Electronic Fuel Injection Enhancer) and followed the instructions. They were accurate but careful attention is required.
The unit is installed and is adding 250~300 mV to the O2 sensor output.
I have just topped of the tank and will post a report in a week or two.

Briefly, the circuit I have installed adds to the voltage signal from the O2 sensor. (An Offset) This control loop uses the O2 sensor to continuously adjust the fuel injectors for the proper fuel/air ratio. This optimum fuel/air ratio is a calibration point of 500 mV. The added voltage changes the O2 sensor output to a value the computer (ECU) knows is rich. The ECU reduces the (on) time to the injectors until 500 mV is achieved. This new value is leaner because of the offset voltage. The automotive designers must use values that work for all drivers in all conditions. It is this area of (safety margin) that I believe some additional fuel savings may exist.
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