Important things highlighted in the pictures:
Steering wheel range locked to 180°.
MOST IMPORTANT: I heavily recommend to set and use the wheel range (lock) in every car. You can find it at the "SETUP Screen - GENERAL" tab. Set the value between: 310° - 450°. The lower the better.
I personally use 310°, sometimes 360-410° (varies car to car) in very tight street tracks with hairpins like the Lowe's at Monaco, or Macau's Melco hairpin.
Works great with modern GT3/GTE/LMP and even with Formula and Touring cars.
Installation:
Copy & paste the file here:
C:\Program Files (x86)\Steam\steamapps\common\rFactor 2\UserData\Controller
Then load it up in the game.
This is the best/most natural controller setting i made in the past 3 years.
Works with PS4/Steam controller. If you want to use the GYRO sensor then remove the deadzone.