how to do better handling with tuning in files

[Terra666]

so i was just tuning some random cars like supra or gtr and when i increase torque and hp it spins out and thats normal but i just wanna know how to make them get better handling with using the assetto corsa car tuner or just from the data file, can someone teach me how to make the car get better handling? btw its like 600hp tune or smth and supra just spins and gtr understeers

 

[Snailer]

Editing the original car files us against AC's ToS. If you want to play around with torque curves and handling, there are many pointers around to how you can make your own mod from scratch.