SAFC2 help with mpg

[BigVinnie]

Originally Posted by Def

Misinformation yet AGAIN... You're on a roll...

Your mis understanding basic laymens terms. 3% lean on an SAFC will not account for a 3% reduction in injector duty cycle, especially when you have 12 NE-Points that are wide spread through out the rpm range.
It's worse with OBD2 since it is always accounting for a target A/Fr.

[Def]

Originally Posted by BigVinnie

Your mis understanding basic laymens terms. 3% lean on an SAFC will not account for a 3% reduction in injector duty cycle, especially when you have 12 NE-Points that are wide spread through out the rpm range.
It's worse with OBD2 since it is always accounting for a target A/Fr.

Of course it's not going to reduce IDC by 3%(i.e. going from 6% IDC to 3%) if that's what you're saying. It will approximately reduce the amount of fuel injected on each cycle by round about 3%. Of course, this depends on the fuel cell value and a host of other things, but 3% less airflow means about 3% less fuel.

OBD2 ECUs do not always go for a target AFR anymore than OBD1 ECUs do. They have distinct open loop and closed loop control modes.