Quote:
Originally Posted by Tor
If it's consistently reading inaccurate, does it really matter? Say, it's always reading 12 when the WB at the tail reads 11.5.
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This I agree with. The key is the optimum of power and knock resistance. The rest in largely irrelevant.
Quote:
Originally Posted by Tor
How much variance did you see? It would also be interesting if the variance is the same between different cars (canned tunes).
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On a SC car the readings become increasingly skewed at higher RPM. Even if the input AFRs are the same and the tailpipe WBO2s also show the same. Probably less of an issue on an NA car. I remember that EcuTek verified a WBO2 against the OEM sensor, it's in their docs. Someone else said that theirs ran well on it, mine was 1 AFR or so leaner for the majority of the powerband. I also ran mine on a leaner scale than ztan's, the one that everyone uses. I did it so that it would read leaner so I would essentially tune it a little rich. It was still too lean at the tailpipe. So now mine is my own scale correlated to my findings on a dyno I trust giving me AFR values that I know work. Before anyone comments I know that the tailpipe sensor will read leaner by nature, but we expect in the region of 0.1-0.2. This is largely irrelevant however as on the dyno we can tune for the optimum without actually needing a set target/matching AFR and the AFR output is more an understanding of what's happening.