NefMoto

A turbo has been added to the VR6 ME7.1.1 engine. I have a problem with lambda sensors, the original ECU configuration has two wideband sensors. Now the sensors are behind the turbo. Could someone help me switch to a single sensor?

You can look into CLRS

I read here on the forum about switching to mono lambda and many people write that it can't be done in the map change. In the 2.7biturbo ME7.1 Audi, someone did it by changing the program code.

You can just set second lambda value to the first lambda ADC value. And thats it. And disable electric diagnostics by ESKONF.

No, that's not it. After that you can buy new engine, but probably will have limp mode before that.

I have done single O2 patch on this SW in 2019, I can sell it to you if you want it.

But take care to adjust the bank wise lambda split, for that probably you have to fit lambda on some runners or egt on some runners of each bank.
Otherwise you will damage the engine if you run it hard, because on VR6 there is a problem with the breathing of the two banks, so if you regulate with single O2 you will have equal fuel injected in both banks, but this is not what you want.

What do you think...If I set CLRS to 00000001 then the regulation should be for bank1?

I read this information

You can not solve it in calibration. Changing CLRS will just result in 3 cylinders being regulated and 3 unregulated, you will grenade the engine.

At this point my engine has turbo and wideband lambda after turbo. I also installed a second wideband probe after turbo (and connected it to ECU on bank2), but it works for a while and starts trimming to bank1 +25%, bank2 -25%, it stays like that and the engine starts to work unevenly.

It will only disable bank 2 regulation through b_lrs2


When that happens, what is the value of lamsoni and lamsoni2 ? You could disable b_lrs2, use the fuel trim correction of bank 1 to calculate rk2_w and make use of KFBS for disparity between both banks. (You would likely need to create a model to have a more reliable control over both banks with only one wideband)

If you are not too far in your tuning, you could look for a VR6 2.8 firmware with mono lambda (SY_STERVK = 0) like 022906032FD

These are only ideas, if you are looking for a proven solution, you should buy Prj's patch

Stop peddling this, it will never ever work. The result will be that ONE bank will be lambda controlled based on feedback from TWO banks and the OTHER bank will not be controlled whatsoever.
Disabling b_lrs2 does not magically make bank 2 somehow follow bank 1! And controlling only half of the engine based on the feedback from the whole engine is just retarded, it will result in almost instant engine damage.

I bought the solution from prj. I hope that within a few days I will be able to upload it.

prj - Thanks

I know disabling b_lrs2 does not make bank 2 follow bank 1. If I were to use fr_w, fra_w to calculate rk_2 instead of fr2_w, fra2_w wouldn't bank 1 and 2 use the feedback from both banks? For disparity between bank 1 and 2 due to the VR6 configuration, I am thinking it could be managed with the same logic as KFBS. Disparities that could be modelled by using a second O2, then this model could be used to properly control bank 1 and bank 2 based on one wideband for both banks

Bank to bank IS managed using KFBS.
I don't change a single calibration label in my solution (just ESKONF and diagnosis has to be turned off for the unused bank) and there are no issues. But of course more ways than one to skin a cat, although your list is missing a few key points.

Regardless, there is no calibration only solution for this. And I believe I already posted years ago exactly what has to be done, it's not a secret.
Because the job has to be done for each SW manually, and there's a huge amount of different VR6 engines, then you either know ASM or you pay someone to do it for you...
It's all different ST10, C166, various variations of the C166 etc.

Yes you did, here is the post: http://nefariousmotorsports.com/forum/index.php?topic=19177.msg143962#msg143962

I uploaded the file, the prj solution works great. Now I need to play around with calibration.

Btw in case someone ever sees this and tries implementing own solution - copying rk_w is a bad idea because it stops KFBS from working.
Depending on manifold design that can be very bad for the engine. With the fuel trim copy solution everything works like a single lambda car including all the maps, so bank to bank split can be adjusted correctly using KFBS.