So I'm going to make my own ffb steering wheel but I have a few questions.
1.Does DIY steering wheel always works on this game?
2.Can you guys share your experience in making DIY steering wheel?
tks for reading

Hi dude, to answer your questions:
1. yes
2. yes

Have a look here, I've made an Arduino Leonardo-based firmware for an FFB wheel, you have all the details and instructions in my GitHub.
https://github.com/ranenbg/Arduino-FFB-wheel
https://github.com/ranenbg/Arduino-FFB-gui

Thank you very much rane_nbg,
A real gold mine ! Fantastic !