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I've been intrigued with the idea of using the O2 sensor as a measuring device for fuel consumption after seeing an air/fuel gauge in the new IPD catalog. I bought a SunPro from Adanced Auto for around $30.00 less to play with. I also have a voltage oscillation board that I built to send a variable pulse to the ECU of between .1VDC and .9VDC (www.madcosm.com). The idea is to drive for a couple of days with the gauge installed and watch the pattern. This 88 765 has never gotten what I would call excellent mileage, around 22 mpg with and without the turbo, and the operation of the O2 sensor has already shown me that the sensor is detecting a lean run condition for more than 50% of the time. That voltage is sent to the ECU at around .25 to .4VDC which in turn richens the mixture until the O2 sensor tells it to back off. That means that the injectors are richening the mixture for more than 50% of the time also.
My goal is to send a voltage of about .45 to .60VDC to the ECU with the power supply separate from the O2 sensor, then read the actual(not inverted)air fuel mix on the gauge and adjust until it is just in the lean range of "ideal". If this works, I would expect another 2 to 3 mpg at highway speed.
Regards,
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Will Dallas, www.willdallas.us, www.willdallas.org, www.willdallas.com, www.dallasprecision.com 86 245 DL 222K miles, 93 940 260K miles, 88 765 GLE 152K miles
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