Originally Posted by MrMoPar
Some new vehicles are moving to use of a wide band sensor giving the ecu greater control over afr in all conditions, thereby staying in a closed loop mode at all times. That design could adjust to any afr desired by the ecu.
With a narrowband sensor, it is only accurate around the midpoint voltage so the ecu ticks on either side to obtain an average 14.7 afr. O2 sensor offset can add some fuel while in closed loop, but it will not be more than a coarse adjustment as sensitivity of the narrowband degrades the farther one moves from midpoint.
What did you see for closed loop boost before cranking up the boost?
Thanks for the explanation, as that was just what I needed to hear. Unfortunately I didn't install the gauges until after I increased the boost, so I don't know what the norm is.
A couple days ago I saw 14psi in closed loop and I believe the max boost these make stock is the same. That's what scares me.
