WOT Tuning Problems

[Xit40]

I went out this morning put some Sunoco 260 GT 100 Octane fuel in and and planned on doing some WOT tuning. Immediately soon after I got into it something seemed wrong and I pulled out of it. My wideband says AFR's were extremely lean. I've checked all my exhaust connections and they are all tight and leak free. What is going on here? Any help or suggestions would be great.

Also I was wondering if there's a time offset for logging the wideband. Mine is in the rear o2 sensor location and there is a slight time delay by the time the exhaust reaches and is read by the wideband.

 

[livedsm4g63]

So it only started to do it when you added the 100 octane?

I see your global is set for 835 but you have 850's. Are you sure your fuel trims are set up correctly?
And if you can move that Wideband up further. Being that far back isnt good for a great tune. It can be done but the reaction time to delayed a lot. Closer the better.

 

[Xit40]

Yeah it's a fuel delivery problem. See this thread here if your interested in helping. It's not building the fuel pressure it should. The gas I run here is E10 hence the difference in injector size.