faking an o2 sensor
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faking an o2 sensor
another efi question....
ive got headers on my truck currently, and need o2 sensors for a fuel injection conversion. i know i could drill the holes and weld sensor fittings, but i was wondering if since the 02 sensor sends back an electric current, and the computer responds and adjusts air/fuel ratio according to the strength of that signal, what if i ran the o2 plugs to a **** in the cab that would allow me to adjust corrent, and ran an air/fuel ratio meter, would i be able to adjust the current therefore adjusting the air/fuel ratio? does anyone think this could work?
ive got headers on my truck currently, and need o2 sensors for a fuel injection conversion. i know i could drill the holes and weld sensor fittings, but i was wondering if since the 02 sensor sends back an electric current, and the computer responds and adjusts air/fuel ratio according to the strength of that signal, what if i ran the o2 plugs to a **** in the cab that would allow me to adjust corrent, and ran an air/fuel ratio meter, would i be able to adjust the current therefore adjusting the air/fuel ratio? does anyone think this could work?
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"The Exhaust Gass Oxygen Sensor detects the presence of oxygen in the exhaust and produces a variable voltage according to the amount of oxygen detected. A high concentration of oxygen (lean air/fuel ratio) in the exhaust produces a low voltage signal less than 0.4 volts. A low concentration of oxygen (rich air/fuel ratio) produces a high voltage signal greater than 0.6 volts. The 02 provides feedback to the computer (EEC) indicating air/fuel ratio in order to achieve a near stoichiometric air/fuel ratio of 14.7:1 during closed loop engine operation. The 02 generates a voltage between 0.0 and 1.1 volts."
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i get what the o2 sensor does, it senses the air/fuel ratio, and processes an "in" current and sends it back to the computer as a weaker or stronger electrical siglal, with .1-.9 volts being the target signal strength to acheive an air/fuel ratio of 14.7 to 1. well all im saying is what if i was to run that "in" current to one of those ***** that adjust current like a light dimmer (i forget the name...a potentiator maybe?)...but then run that back to the computer, and i could tune it to the target voltage to simulate correct levels of air and fuel in my exhaust, therefore injecting the proper air/fuel ratio...or i could simulate too much air in the exhaust to make it inject a rich air/fuel ratio.
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From: Durham, NC
Originally Posted by peter81083
i know adding o2 sensors isnt a big deal, im just wondering if this would work.
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From: Lacey, WA
Peter,
In theory your setup would work. In the real world you could not perform the very fine adjustments quick enough to satifiy the computer. Just as soon as the voltage signal that you are adjusting went out of the "window" that the computer expects to see for a given set of driving conditions, the "Check engine" light would come on and the computer would revert to using a fail safe set of parameters to operate on thus ignoring the O2 signal.
By the way, not all O2 sensors are heated externally.
Take care,
In theory your setup would work. In the real world you could not perform the very fine adjustments quick enough to satifiy the computer. Just as soon as the voltage signal that you are adjusting went out of the "window" that the computer expects to see for a given set of driving conditions, the "Check engine" light would come on and the computer would revert to using a fail safe set of parameters to operate on thus ignoring the O2 signal.
By the way, not all O2 sensors are heated externally.
Take care,