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Originally Posted by sperry
Your car's sensor is in cyl #3 (the one that tends to run lean). Since I've got fuel rails, I don't believe I have a particular cylinder that's prone to running lean. Also, I'm running jet-coated headers, so they might be holding a bit more heat... but I'm not really sure about how much difference that makes.
You're right about being in close-loop. Car could be running lean, but that's probably not a big problem since it's low load... though that might explain the odd hesitation I've noticed around 4k rpm under partial throttle... I wonder if I've got a little knock correction going on? (I still owe MikeW a data log of the hesitation, but I didn't want to try to do it in the freezing rain on Sunday.) At WOT, my egt's actually decrease, IIRC.
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Well, the lower tems a WOT are good. And yes, closed should be a little leaner, but not so much that temps are high, and you might be getting some detonation.
I would agree it is time to get some logs for closed loop.