Hi,
I've found out that after TFSI coil converstion my car (basically two cars) have problem with ignition and therefore with starting when the voltage drops to 8.5V+- while cranking. ECU seems to get sync because it starts injecting fuel and rpm (about 150rpm) can be observed in me7logger. Tsrldyn is 3.5ms. After helping main battery with connecting other battery to get about 9-10V while cranking, the spark appears and car starts... Does someone have similiar problem?
Yeah, normal issue in cold weather (e.g. -10C and below), also had the same problem on 2.2T when dwell was not adjusted in ECU. Because the dwell time is way too high and it gets exponentially too high with the battery voltage being lower, so it literally just kills the battery charging the coils.
Look a little more at ZUESZ, the standard tsrldyn calculation is not used during starting IIRC.
You must correct all the maps:
KFTSRL
KFSZDUB to have the correct correction same as on a TFSI.
And then also especially KFSZT, this one is used <800 rpm during cranking. Look what happens at 8V and below, it's way way too high for TFSI coils.
FSZTM multiplies it even higher at low temperatures.
Look how it's done on TFSI and correct all these maps to be the same, not just KFTSRL as you probaly have done, or if you didn't correct anything, then it's just stupid because the TFSI coils fail quite fast with the too high dwell time!