So I've been thinking about getting a PC5. The thing that bugs me is this. when one uses a PC, the o2 sensor need to be bypassed. So if the o2 are not giving the ECU readings, what happens when you go up in elevation, or it's really hot out? It seems like the mixture would be way out of wack without the feedback from the o2 sensors. Would it not make more sense to add the correct value of resistor to the o2 sensors, and let the Honda ECU make all of the adjustments? If one could figure out the correct value of resistor, you could fool the ECU into keeping the bike a little rich or lean.
most motorcycles are open loop FI. The VFR was before it's time compared to other bikes on the market with its closed loop system. The MAP, AIT, and MAF sensors are how the ECU knows how to adjust for the factors you listed. The o2 sensors are a double check to make sure that it's happened properly.