OEMs got rid of their high failure rate flex fuel sensors as soon as they figured out they could achieve the same reliably and cheaper by using an existing O2 sensor...foreverska wrote:Well jacking with a static of your REQ_FUEL is hardly the "correct" way of doing it but it will achieve the desired result.
The trouble with lamda is it can mean anything. To find out how much fuel goes into the mixture the ECU needs to know a target AFR and lambda simply doesn't tell it that. But lambda is correct for automatic correction and trim. You're right about the alchol mixes and I think that's why OEMs here in the states went with ethanol sensors on their Flex Fuel vehicles.
As noted, lambda is defined (and what is actually measured by any lambda sensor, oddly... )
AFR is always a calculated value and can vary tank to tank...