Quote:
Originally Posted by steve99
Ues oft will log afr ( measured) and Commanded afr.
The ecu and all logging will always show petrol afr no matter if your on petrol or e85 or any mix even if you had flex kit.
The 02 sensor measures lambda but the ecu works in petrol afr and so does logging.
So at idle say lambda is usually 1 so afr and commanded afr will be 14.7 petrol afr even if your running e85. The real afr is different but ecu alwats works in petrol scaled afr. Commanded afr will always be in petrol afr as well, ecu doesnt know anytging about ethanol afr even if you have flex kit
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Very interesting! So it is the O2 sensor that is the key here? It can recognize the afr and relay the information to the ecu to compensate with the correct fuel trims? So all the oft tune does is advance the ignition timing right?, which I understand in how it produces more power