Well guys. I've finally been able to get Me7Logger working by fighting with fuses 11 and 15 and the ignition.

Logged lambts_w, lamfa_w, lamsbg_w, lamsoni_w, tabgbts_w, tabgm_w, talsuf, tavvkm_w and tikatm_w

As I suspected TABGBTS sets a point (with DTBTS histeresys to unset) where LAMBTSENABLE activates and sets flbts_w. That enables LAMBTS. But it keeps lambts_w stoichiometric as FBSTABGM is multiplying by 0 until 900ºC.

I logged those other exhaust temperatures to ensure that I was no exceeding safety values in any component (The highest point I saw was 840ºC is it ok?)

That means that below 3680rpm I was running on lamfa_w (equals to lamsbg_w, final requested lambda). Passed that point tabgbts_w goes above 900ºC and lambts_w enables effectively (equals to lambsg_w)



Things cleared now, time to keep documenting my project. Aaaand you were right guys, VCDS sucks compared to ME7L, It's a shame that connecting is so time consuming... I even had to reset the airbag after all the process. Is putting a direct K-Line really the only way to make it simpler?

Of course nyet, this night I'll take a look of it to post here my advices (Or via PM if you prefer)

As nyet suggested, I took a look at this section on S4wiki. Although LAMBTS seems to be a little short and superficial, compensates it very well in the EGT subsection.

The only things that I think could improve the wiki even more are the following (from my point of view):

Don't blindly trust TABGBTS, as FBSTABGM is usually 0 on its first column. So if TABGBTS is 400ºC and FBSTABGM has a 0 as its first value (let's say at 900ºC), then FBSTABGM is the real trigger.

tabgbts_w (Calculated exhaust gas temperature for component protection) is very pessimistic. Higher than the rest of calculated temperatures, likely higher than real temperature too.


Regards.

Just to illustrate this statement, a piece of today's log from my rs6. It's not a stocker, running bigger turbos with an unfinished tune. You can see that the model is fairly accurate, being a bit "slow-ish" for high load pulls, but that's most likely just my setup.

One of my best friends has recently bought an AQX ibiza, 6k0906032. I was taking a look at his stock file and that thing goes always in BTS.

TABGBTS 100ºC
FBSTABGM always 1

I knew some cars were programmed like this from factory but I had never worked with one of them until now. It's interesting to see different stock strategies.