So after half a year+ its time to update this and (hopefully) keep it updated for history if somebody wants to do the same
Got the B4 fixed up and running as backup car so that means I can finally have the downtime needed with the project car
after years of dailying every single day.
So the reason for the long delay is that the wiring harness on these cars/ecus is just a tiny bit more work than just converting the o2 to wideband, simply didnt have the time for the downtime for them and the other required harness changes.
The atmospheric me7.5 runs on wasted spark coil, this means you dont have the other 2 signal wires coming from the ECU for the single COP's on turbo cars,so you gotta add them like the wideband wires.
Pins that you need add are :
94 and
95. The other two,
102 and
103 you can reuse from original harness, aswell as the power which comes from ECU relay and ground too coupled on all coils.
The other thing is the MAP sensor, the wiring for this simply does not exist. You are required to add the signal wire to pin
101, voltage is shared between hall sensor pin 1 and they both go to ecu pin
98, ground is ground.
N75 wiring poses no issues because the factory harness uses these pins(output) as intake manifold switchover ( on many other atmo engines in VAG). Personally will require to switch to a new type connector for the tfsi n75.
And thats about it, wideband wiring has been detailed many times but there can be some differences in pinouts / pin numbering on some ecus, will mention them later on.