Quote:
Originally Posted by PTAddict
As an aside, I think you may have issues trying to get those "self-learning" type of EFI systems to work with your cam. The large overlap cycle will dump so much oxygen into the exhaust at lower RPM that the wideband sensor will still be reading dead lean even when the actual A/F is very rich. You'll probably need to have a controller that can be manually programmed, and it is very useful to have a CO/HC exhaust analyzer available to tune idle and lower RPM mixtures, since they are still reliable indicators of A/F ratio even in the presence of excess O2.
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So true! And even more true with "oxygenated" fuels these days. And I've helped tune guys cars that SMELLED (nose test) pig fat - when they were really LEAN. A guy could write a book about what the O2 sensor "sees" and what you see when tuning with a laptop etc.
But that's for a different thread.