Is TC and ABS modelled in the cars that use them? eg GT3's or do I need to add the driving aid manually when using them? I see in garage menu, there is a TC and ABS option set to 1 for some GT3 cars, but no clickable option to increase or decrease.
yes you have to add them in the driving aid. The menu setup screen is a new thing for now (every car have set to 1, including the historic cars) and I hope that it means ISI is working on a new TC and ABS system