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Alan L Alan L is offline
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Join Date: Apr 2006
Location: New Zealand
Posts: 3,261
I would not think you are underburning - your AFRs are fine until suddenly they take a dive - much earlier than you need. If you had poor cam performance (overlap) , it should be worse at lowest revs. This effect works on velocity of flow and inertia effects of gas movements - things improve in favour of the overlap as things (cams) speed up. It really appears like a fuel dump prematurely. Air leaks would be giving you lean AFR s, the car should thrive on extra fuel (tho not that much), and the leaness would theoretically be worse at the lower rev/fuel range - as they are generally constant and therefore a bigger proportion of the air mass at lower revs.
What is it in your engine that kicks in at 3200 rpm?
Old 06-18-2008, 01:03 PM
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