enough boost is when you have 3 dimple marks in the hood from the valve cover nuts..
I have cracked open probably a half dozen mk3 ecu's and 4 were socketed 2 were soldered, so both exist. The parts(chips) to do it are next to nothing but i would not say its gravy for the chip tuner as there is a very steep learning curve on chip tuning. It takes a lot of knowledge and skill to do it right. You do have some hustlers just throwing one size fits all tunes on chips but a skilled programmer who can get in and modify the directives, maps and info to suit your application and know what he is modifying is worth his weight in gold- while maybe silver at these prices!
Just as I thought, #1 cylinder injector is not budging . Will modify a small slide hammer i have and do another attempt tomorrow
How many of the soldered in ECUs were TDI? FWIW, I have chipped over 100 AHU/1Z cars and have yet to see a soldered TDI board. I have seen gasser MKIIIs with soldered boards, but not TDIs.