On the newer bikes with O2 sensors, how does the Mastertune cope if the AFR is further out of range than the narrow band sensors can measure?

I have to admit that at first I thought the Mastertune was an inferior product because it used the stock O2 sensors. As I read and understand more about EFI and O2 sensors, the Mastertune looks better and better. If it can somehow deal with the limited range of the switching sensors to measure AFR it would move to the very top of my list of tuning aids.
I'm using a PC-III right now, and it works, but without a dyno it's a band aid at best.

Thanks in advance.
Rick

The stock sensors do have a limit but understand the the ECM will correct to that limit. So since we Vtune in the proper range for the stock O2 sensors all we need is that amount. Once the adjustments are made the ECM calculations are now in place to be able to change the AFR table and you will get the proper numbers. So what I mean is that once the VE are correct the AFR can be set to whatever you like and that what you will get. If you calibrated for say 14.4 AFR which the stock O2 handle nicely you will have put an offset in the AFR of .2 AFR since the table needs to be set at 14.6 for closed loop to be able to work. Once the VE's are set correctly you now can change the AFR to 13.4 and you will get 13.2 in the tail pipe. 13.4 - .2 (offset)= 13.2 The ECM will do it everytime and we have backed up the testing with lab quality equipment to make sure of it. It's a simple process once you get the hang of it.

Thank you sir! I had hoped there would be some simple explanation.
Having looked at everything at least three times, the Mastertune looks like the best product for me. I'm going to save up a few more nickles and buy one.

Thanks again Steve.
Rick

I'm going to sell my PC-III save up a few more penny's and buy the Mastertune.