From my original post: "the AFR readings on the wideband". How else would I know? :poke:
I know what a PV does. That's why I'm tuning it... your formula is just a shot in the dark without a wideband AFR gauge and knowing the particulars of my combo. In fact my primaries are a smaller than stock #71, PVCR are a larger .066, and secondaries #86 as I mentioned in my post #17.