Quote:
Originally Posted by superchow
Can anybody think of any reason why dropping some cubes of dry ice (frozen CO2, no?) into the intake would not trick the ECU to interpret that as a low oxygen environment and reduce the fuel injection rate? My theory is that the dry ice when returning into gaseous CO2 would mix with the air rushing past it. The air/CO2 mix should have less oxygen in it and to keep the fuel/air mix right, the engine would have to reduce the amount of fuel injected, therefore causing a lean burn, right?
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If you want to fool the ECU, lie to it directly. Unplug the oxygen sensors, plug them into some circuit/computer, and have that "black box" tell the ECU whatever you want it to see. For instance, if you want to lean things out a few percent have the box tell the ECU there is less oxygen in the exhaust than is actually present. If you don't push it too far you may be able to force the engine to run a bit leaner. Push it too far and the car won't run very well. I don't know exactly how the ECU reads the oxygen sensors (measures voltage, resistance, capacitance, whatever), so you would need to do some research to figure out how to make a controllable "fake" oxygen sensor for the ECU to read.
Don't expect to pass an emission inspection with this in place though!