Just out of interest, would this wideband me7 happen to be an early revision of the me7 map. I can see that nearly all of the narrowband versions use an almost identical kffa but make changes to the the trims map according to the vehicle.

Resurrecting this old thread.   I have similar questions about KFLF.  Running a 1.8T AEB with M5.9.2. Under stock setting I have logged the following wideband AFR and see it dips down to 11-11.5 under high load and high RPM.

 Curios about the fueling logic here:

I was thinking once load values in TLRAN (Lastschwelle Lambdaregelung) are exceeded, the injector time values in KFFA (Kennfeld für Anfettung zum Kat-Schutz bei ständig hohem tL) and perhaps KFFAVL (Kennfeld für Anfettung zum Kat-Schutz bei VL)  are added to what is specified by KFLF (Lambdakennfeld bei Teillast) values.  I believe the values in KFLF are a multiplier correction from lambda = 1.

This does not make much sense when I look at my map values.  Values in KFLF are all close to unity for my bin (1997 A4 B5 1.8T) and the KFFA and KFFAVL are all zero for the stock settings so I assume nothing is added yet I seem to drop way down below stoich when under load.

Where is the correction coming from once I go open loop?  I must be missing a map somewhere.  The alternative is that in open loop I am still only using the KFLF values and small increases in KFLF values  (slightly different values than 1) make the big changes in AFR for the load & RPM I logged.  If correct, it must be highly non linear. 

If I desire to run AFRs more close to 12.5 under open loop, do I play with values in KFLF where I exceed loads in TLRAN?  Please let me know if I am missing a map and additional logic for fueling.

Thanks for whatever info you can share.

Maybe KFTLWS