I'm baffled,

I just discovered (but was suspicious for awhile) that I do ot have any O2 sensors on my Z28.

My question is, how does the motor adjust for AFR???

Also when I use the Predator, how is it able to diagnose AFR??

 

If you look at the GM parts computer, it shows plugs where the O2 sensors go on export vehicles. Since your location is Dubai, UAE, I'm guessing your's is an export vehicle. Don't know about the AFR. There are tuners who tune without O2s, but I think they eliminate the MAF when they do.

 

Yes, it is an export vehicle. So like you said, the O2's could be in another location.
I'll have to check with the dealership to see where they are.

The funny thing is Predator does tune it and adjust for AFR +/- as it is designed to do.
The Aussies tune without MAF but mine has one (GMAF).

I know they are not on the manifolds, so I'm still puzzled. In what other way does the engine measure and is able to adjust for AFR?