I have a stock car that I occasionally race. Since it is street driven, I need to keep it registered and pass smog. You may already know how an O2 sensor works. Look at my simple sketch I attached. I have an adjustable mixture kit I install for when I race, but the O2 sensor will throw it off when doing its job. What I want is to convert a spare O2 sensor with the 3.64v reference voltage supplied by the ECM to a steady .45v, (instead of fluctuating between the normal .1 - .9 volts in normal operation), which which keep the mixture proper for the race track. I was thinking a voltage divider inline on the signal wire, maybe? Can you give me a circuit recommendation with resistor and/or capacitor values, etc? Much appreciated, thanks.
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