Thanks guys, for the info.
Just got back from a rolling early spring tune up on the Tahoe. I was concerned with a 1600 degree temp while idling along at highway speed. The advance in the timing map in that area took it down to 1400.
I had put a third wide band in one of the tail pipes to verify the two built in LC1's. A couple of years ago, I burned up some parts going lean, so I am trying to be careful this time around.
WOT was showing a little over 1600 degrees and 12.5:1 on the wide band's. I will have to get on the dyno to finish the tuning. I'm sure the highway patrol would appreciate that too.
The closed loop with the Innovate LC-1 and Tec 3 works like a charm. A/F follows the fuel map perfectly. Right now I have the top of the fuel map set to 12.5:1 for WOT. I will fatten that up before I get it on the dyno.
Thanks again for the help, it is greatly appreciated.............
Del