I live in Brasil and we deal with E100 since the 70´s...

We have ME7.5.20 and 7.5.30 here wich are OEM flex fuel (E100~E20) as they are very diferent from the ME7 used in 1.8T and other we can´t tell how it works with sure, but i has +/-25% correction from the base fuel map, if the ECU states the fuel is E100 the adaptative can reach +/- 25% before a MIL code, if states E20 the same occurs.   If it´s not just a KRKTE adjustament... in theory you can adjust KRKTE to be in the middle (in you case E85~E10) but it will have some issues in the warming or starting in some temperature/fuel.

PS: these ME7 states the mixture only by the lambda probe, some has only 2 narrow band sensors, and some have a Wideband sensor, the strategy is made when you refill with more than 20 liters, engine is off for more than a certain time, and other triggers.


To simple convert to E85 you can start adding about 5~6° ... here with E100 We start with 7~8°... in some condition/engines I add even more than 10°.

Is KFZWOP suppose to = MBT ?

Ah. so because E85 has a different burn rate than gas... stock (gas) KFZWOP <> MBT (or 50% heat @ 8* ATDC) on E85.

You can do it that way, then ignition and fuel is working:

Injection:
-krkte in the middle of e85/e100 and the lowest e-possibility (in some countries 0, in other up to 20)
-typically the difference of e85 to e5/e10 (european fuel) is around 28%, so your lambda adaption window with 28%/2 will be enough with +-25%, that way you will find very fast a not working maf and lambda . But if you were using E0...E100 you will have to widen the allowed adaption value to around +-30%, as the difference is already around 40%, and if you drive in different atmospheric pressure it could be that it is not enough with +-25%
- raise the adaption-speed per injection and ignition, that way you will have after about 1mile driving already the adapted fuel
- for a good cold start in low temperatures, you will have to raise the enrichment up to 10degrees with around 500%. The warm-up cycle will be ok with around 30% raised. Also you can let the throttle a little bit more open in starting (around 5-8degrees) up to 400rpm. That will prevent overfueling in starting with gas


Ignition:
- Setup the highest allowed retarding to around 7.5degrees, that way it will jump automatically in another ingition table. You can setup than one for your E85/E100 and one for your gas, as the difference is very huge. Also you can setup the speed of reaction for that action
- Starting angle should be raised at temperatures below 10degrees celcius around 8degrees
- The optimum Ignition angle should be raised on most of the ecus available, as you can drive with e85 in most cases higher than the oem-values for gas. Remember also to raise the small maps for the driver requested ignition, as otherwise it will go to a very late ignition when you drive normal

Doing it that way you can mix it up.

The disadvantages are:
- you will drive much too rich for e85 on engines that do not have an egt-sensor, in protection mode you will never need that high enrichment like with gas, as you cool already around 20% down with e85 compared to gas
- when you drive with pure gas, you will have to wait some seconds before the correct ingnition table is used as it will first have to realize the knocking
- to be more safely you will have to setup a lot of safety-functions (reducing load by knocking etc.)

Sweet!

Thank you again, you are very helpful Now I've found these maps rkatmn/mx - rkatrn/rx and rkazmn/mx - rkazrn/rx, TVLRA, but they look like they're threshold for adaptation (except for TVLRA, which is time for adaptation or something - in my file it is 2 seconds) and they're in %. So should I just make for example rkatrn -30% and rkatrx +30% ? And in TVLRA should I just lower it to 1 second? Maybe you remember ID of throttle plate angle on cold start (or other map with which I could open throttle plate a lil bit wider on cold start)?

Also I've found two enrichment maps FKSTT_1_A and FKSTT_0_A, so I've changed them both. Maybe you know why there are two maps instead of one?

And finally what do you think, will these be sufficient? (image attached)

QUESTION: Should I advance ignition or leave as it is during coldstart on E85? map id: KFZWSTTM
Right now my cold starts are very rough and car dies during first few attempts to start (engine starts for a second and then just dies, then I have to start the engine again. The fourth time I start engine it's rpm holds normally)

PS:> My current enrichment and ignition angle