I agree with you that the O2 sensor doesn't lie, but it is giving you the average of that cylinder bank. Even on boosted engines its not umcommon for the A/F to vary from cyl to cyl as much as .5. This is why plug checks should be mandatory to verify what the O2 is saying on each cylinder not to mention timing and plug heat range checks. Now if the average O2 was 11.0 there would be more of a cushion to cover the potential lean cylinder. Imagine if the average is 13.5 and one cylinder (#7) is 14.0 under that boost / power level!! Too bad the dyno sheet doesn't have fuel flow or BSFC's listed. A lot of engine shops rely on the fuel being consumed more than the O2's to get the motor dialed in.
Thread: Advise from my gear head friends
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02-18-2012 12:14 PM