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2,360 Posts
incorrect. it is not only invalid it is not certified on any continent for exhaust anaylisis. that is more than lame, 800V. correcting MAP is the first step in engine tuning. then if an O2 sensor is all you can afford, and you can't use any experience to final tune it.....well you are basically screwed.AFR is a valid indication of combustion. Air and fuel is what an engine lives and breathes on. Measuring the after effect and calculating it it is one of the best resources any one could have. Pressure of the intake, exhaust and chamber during combustion is another. (if you have $10 000). Exhaust temperature is good along with afr. But then that gets complicated to many.
The practicability of using afr to reference air and fuel is just as useful and accurate as calculating air with pressure and temperature. Its doing a calculation based on known facts.
Willy is about the only joke.