Air/fuel ratio

[lamcote]

I'm just getting my head round fuel trims and open/closed loops etc, all very exciting!

I wonder if anyone can tell me what air/fuel ratio the standard map gives at maximum load? I have seen reference on other forums to standard maps going as rich as 11:1 (Lexus I think) and I wondered what ours is.

Secondly, does anyone know how much difference a piggyback map such as emanage makes to the standard air/fuel ratio settings on a naturally aspirated engine?

At the moment I am guessing that a custom map gains more from changes to the ignition map than the fuel map but I am happy to be told otherwise.

Another assumption I have arrived at is that the long term fuel trim is used to adjust the mixture settings in both the closed and open loop, is this correct?

Thanks

[Glubux]

As far as I remember, Afr at maximum load on my stock engine was around 13.5 from 1000 to 3500 rpm and then 14.7 till 7000rpm.