R32 rear lambda removal of wiring after ECU tweek

Lol. I was wondering if the OP was removing the 02 sensor after a tune, which would throw out your exhaust gas temp model which in turn has effects on other areas within the ecu, especially the calcs.

The EGAS system is nothing like the ones in the earlier 3.8/7.5 ecu's, it is far more advanced and has far more features, namely the integration of the warm-up and afterstart dynamics into a stand alone feature. Bosch called this LANSWL and this is not on those earlier ecu's but is more simplified and integrated into other areas. If you look at the thread I put up about tuning the ME systems in the VAGCOM area you can see the older ones have warm-up maps but not this LANSWL in the comparison tables;

This is the main advancement in the adaptability of the EGAS system compared with older ones.

When determining the exhaust gas temp model in calculations, the ecu uses pre and post cat sensors for the heat quantity dew point as I've highlighted but also post cat in other areas too as you can see, a mixture of component protections, smooth running but also for the adaptability of the system under constant monitoring;


As well as things like wall wetting/combustion chamber operations and so on;


Where the ecu really differs is the now full VVT and at this point it seems VW/Bosch got back into the VRIM (as I call it) aspects, the variable resonance manifold change over barrel functions all of which take into account these models (look at the new VR6 twin turbo engine, they use a VRIM there but smaller I assume due to keeping the plenum off the top of the engine - heat, as well as less material so they frequency tune it off another wave to keep the packaging constraints small and material costs down). Here is the EGAS system is used to determine the mass air flow through the VRIM at idle for example;


There are also safety aspects to take into account too don't forget (AEVABU isn't on some other ME ecu's either);


As you have rightly said, component protection features are not needed (if you are not using a cat), plus rudimentary switches for things like CAT heating;




But the essential dynamics of the far superior models within the R32 ecu have so many features compared with the older ones I would make sure whoever is tuning it takes these into account and if, as I was getting at in the first place, you are removing it AFTER a tune, then be aware of what effects this could have on the tune and ecu

Rick

 

Rick,

I can see your passion, however I am not sure what was written bears any correlation to the official Bosch training guidelines, which I cannot share.
The ME7.X screen shots, of what looks like ECU feature aggregates from WinOls editing software and an unknown map pack, are NOT used to switch off the rear lambda or the effect it has on cat efficiency.
Also if you unplug the CMS (another name for the rear sensor), on a vehicle with catalyst/s, the effect this would have on tail pipe emissions would be great but the impact on driveability would be small. Plus as the CMS would have an impact on emissions, you will have the MIL come on as the feedback system tries to compensate for a static CMS 0.45v to a clip.

 

Although that particular file has been called into question, I do have numerous function sheets, white papers, SSP's, all sorts really as well as about 30-40 different VR6/R32 bin files I am currently going through. Granted I have not gone through the egas system too much yet, looking at the differences in cam timing, injections and then the various LDR functions but as the newer ecu's all feature more adaptive controls and with the info I saw stating it used all lambda points as reference areas then I was wondering what effect this would have on correct tuning.

It would certainly help if Bosch got their finger out for me though, they are starting to cost me money now which I am getting annoyed at, I requested the 7.1.1 function sheet over a month ago now!

Toyo/Eddie is it - it's nice to actually discuss these points with someone you know, I have talked with a few re-mappers since I started studying these ecu's a couple of years ago, even VW specialist ones and they just seem to buy map packs and have no clue what goes on in the ecu when I am trying to ascertain more fundamental properties