how lean is too lean for o2's?
 

and how rich is too rich

at 65pounds of fuel presure i start at .93 and evenly taper down to .87 in the 1/4 mile

at 59psi i start at .91 and evenly taper down to .85

should the o2's hold steady? increase or does this seem ok?

Re: how lean is too lean for o2's?
 

Remember, switching type O2 sensors (like ours) are not totally accurate at WOT. Just keep that in mind!!

IMO .92 is too rich from what I've seen. On a good cold day, I've been able to run well with O2 readings at .84 with no KR. In my tuning, I shoot for .87-.88.

I'll be dynoing with a wide-band tomorrow to really dial it in and I'll reference my O2's to see if I can get a workable correlation.

Mark