This Field of View (FOV) calculator will help you setup your screens for sim racing, giving you a correct feel within the sim that will help you become faster and more consistent. Don't want to read all this? Watch my video on how to setup FOV in iRacing instead! Supported sims: iRacing, more coming soon! If this page or video helped you out, consider donating to my channel, it really helps me out and allows me to continue making these kinds of videos.
Once you have the above set in iRacing correctly and you have made sure your monitor angles match the above angle, you now need to make sure your horizon is set correctly, based on your height against your monitors. This will prevent warping on your side monitors.
If your eye line to the screen is too far vertically off center, then you will need to adjust the Vanish Y.
My best tip is to jump in a car and open up the camera tools (CTRL F12). Adjust the Vanish Y, until everything across all monitors looks straight. Once you have a number that works, set only half of that number to Vanish Y.
Now we will adjust the driver head rotation (Orient P). Use this same halved number and multiply it by 0.3, this will give you the driver head rotation number. This will align the monitors to the original number that made your monitors straight, but also keep the driver's eye line to the horizon.