Boost is tuned, little 1.6bar spike then constant 1.5bar boost. It's not that I can't tune it, it's the fact that the turbo solenoid valve seems to not be so precise on higher boost values.
The ECU does not see more than 2550mbar. But you don't need an MBC, it can just be tuned to a fixed WGDC value.
Nothing to do with "being precise" or not. The only thing a MBC is good for, is to put it in parallel with the N75, to make sure the boost does not spike over a certain value.
ME1.5.5 it's a hybrid ecu, narrowband, indeed operating principle may be close to Me7, but this does not mean that it has same behaviour and precision.
It is basically ME7. Yes it has pretty much same behaviour, and I don't see why you are talking about "precision". I don't think you quite understand what this word means in this context.
And yes, I don't know how to tune the new MAF, no one was born a genius, I mentioned my experience is limited on these ecus. All I said about it is that I tried the diameters square ratio method, which is described all over this forum, but no one except one user here suggested MAF offset correction also, which sounds pure logical now once it was explained.
Fit the stock MAF, then tune the injectors to be perfect.
After you are done, fit the new MAF, and tune it again to be perfect.
Like this you can tune completely unknown injectors and completely unknown MAF, for which you have no specifications at all.
I would give it to someone who has an idea if I lived in a civilised country and not at the end of the world. In my country there are 2 cars like this, one stock and the other is mine. Closest Opel tuning company is in Germany, 2000km away.
So what country is that?
Also, if you already know how to log the ECU and how to flash it, then I am sure you can be helped online for a fee.
My objective is not to diss your efforts, but you just did the 3 biggest no-no's that apply to tuning these cars:
1. Fitting a BOV.
2. Removing a MAF.
3. Fitting a MBC.
Add to that the fact that you make bold claims about "precision" when not fully understanding what you are doing, and you don't come over too well, that's the thing.
If asking for help you need to be more specific, for example:
I changed the MAF, then changed map X and map Y. The car was doing Z and I logged values P and Q to confirm.
Also, first thing will be to fit a recirculating valve if you want to get this sorted, as well as fitting back the stock MAF and linearizing the injectors correctly. After that actual tuning can start.