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Message: <blockquote data-quote="Rednaxs60" data-source="post: 231690" data-attributes="member: 4617">Won't be doing any road trials before Xmas and until back from the warmer climates early January; however, still reading/researching various issue that I feel need to be addressed with my project.  The installation of the O2 sensor is being questioned (by myself).  It is located in the right side exhaust manifold.  Works well in this position but does not take into account how the left side of the engine is operating.  I have thought about this and think there are two options to consider.Option 1 - relocate the O2 sensor to the crossover muffler that is in front of the rear wheel.  Don't know how much mixing of the exhaust gases is done in the muffler.Option 2 - install a second O2 sensor in the left exhaust manifold, tie the signal into the ECU for data logging - can't use two O2 sensor signals, and compare the O2 readings and smooth the AFR reading to compensate for the second O2 sensor information.  Many of the newer motorcycles have more than one O2 sensor; however, the OEM ECU is designed to accommodate more than one O2 sensor signal, similar to the OEM CFI system camshaft sensors.  The ECU was designed to accommodate two camshaft signals.The O2 sensor is primarily used for emission standards for low powers and at idle.  The O2 sensor is used in a closed loop mode for this.  A second O2 sensor can be installed in the left side exhaust manifold and the AFR reading can be monitored without having the O2 sensor signal processed by the ECU.The Speeduino ECU has an individual cylinder fuel trim (ICFT) function that allows the tuner to calibrate the fuel being injected into the engine at specific engine load and RPM scenarios.  This function can be used to calibrate and balance the left/right cylinder banks.  Another option/consideration.</blockquote>

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