I was originally having trouble getting Project Cars looking and playing good after the last update, Ive finally got it back to the way it was before. Ive still got to mess about with some of the Visual FX settings to see what makes a difference but here is the settings I have at the moment and its working great on my system. I think the main culprit to why I was having issues was the grass setting, I will try that a bit later on. I just raised the graphics gradually restarting the game each time and making sure it wasn't juddery. If anyone else wants to post up there settings along with there system specs that would be great so we can trying and make improvements here and there...
I should note that I thought the resolution setting affected the HMD but I tried a few different resolutions this morning and it seems I was talking out my ass, so Ive now set it on the lowest 640 x something.
Asus P9 X79
i7 3930K @ 4Ghz