Hi,
1,8t engine, ME7.5 ecu. Running on A98 petrol with zero ethanol. In the summer i installed bigger injectors (bosch EV14 731cc, 0280158235). KRKTE 0,0445, TVUB cannot find for these injectors, so using tvub from 750cc ev14 (1.9202   1.3308 1.0295 0.7708   0.6908 ). Car runs good, fuel trims in few percents, but now weather bacame colder (0°C...-10°C), and i need to crank about 2...3 seconds till engine starts. When it starts-everything ok, no pulsation or smth, car runs like from factory while warming (i have to lower KFFWL maps a little bit). Earlier i was installed 440cc, 550cc injectors, but doesnt have any problems with cold start. So questions:
1. Do i need to adjust FKSTT maps, if i'm stay at A98 petrol? From that i understand, i shouldn't touch it's, because these maps are just phisics - how many fuel evaporates at temperature levels?
2. Maybe different injector angle or big port head can affect it? For example, more fuel stays on wall?
3. While cranking cold engine, voltage about 10V, so maybe in this area TVUB is realy wrong and can causes problems with cold start?
4. From atached log i see, that injection time drops while cranking till engine starts, this is normal?

Maybe someone have any ideas?