iRacing maxes at 179 for three screens, and I think 160 or so for a single screen.
The good part about iRacing is that is has a built in calculator that puts you at exactly the right FOV by inputting the width of your monitor(s), angles (if you have triple screens), and distance from the screen(s). The amount it gives you may not feel correct at first, but this is a hotly debated subject on the iRacing forums, USE WHATEVER THE CALCULATOR TELLS YOU TO if you want the best racing experience. If you really don't like it, try moving closer to your monitor. I'd have to look again, but I think with my triple 23" screen setup my FOV is like 128. Normally a single screen, even close to you, will be a much lower number than that.