with 16.9 @ wot it really wouldnt suprise me if calibration was way off...did you do a free air calibration before running it in your car? Where did you install the wideband at in the system? Tailpipe? If so I thought I remember you saying you have cats...wideband reading post cat is null/void. what was your a/f at idle/cruising speeds in closed loop?
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87 iroc with the usual go fast stuff
heavier than your half ton.
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