Theoretical question

[TopGunn]

Running a power fc I don't use an o2 sensor(Or it isn't functioning properly). What will happen to my motor in terms on how it runs?

[bentvalves]

just get it tuned most tuners turn o2 feedback off in the power fc anyway as it takes an engineer to get functioning properly. A proper tune cruising in vac will net you just as good MPG's as the factory ECU with o2 feedback control.

[Buddyworm]

^werd. I think a decent tuner should be able to get you running the right afr's with or without the o2 sensor.

[float_6969]

I also agree. Any decent tuner should be able to tune the engine to get good gas mileage and good AFR's are part throttle with out closed loop.