In the options I choose not to limit the fps and have vsync turned off.
I noticed that when my car is standing in the pitbox the fps get limited to 1000 fps on some tracks, but as soon as I turn my car towards the track the frames get limited to 500. Its also a stable framerate, it doesn't get below or above 500. It is the same with 1000 fps in the pitlane, as soon as I drive back to the pits the limiter jumps back to 1000. Doesn't get above or below it.
I am not sure whats the reason for this just found it funny.
On the other hand I would like to know how I can have unlimited fps with the oculus rift. In the current version my fps are always limited to 75 and all the options under 'misc' are greyed out.
In the old version the fps were unlimited and fluctuated all the time which was useful when streaming or recording so you could see how much buffer you got left when setting the bitrate or using addons like sweetfx.
There is also another minor thing I would like to mention, this is only specific to the rift and not introduced by the new lfs version or the new oculus runtime.
From time to time I get some minor jumps. It's kinda hard to see, but it only happens when going through elevation changes and really tight turns.
http://gfycat.com/HappyPracticalKomododragon
On the top of the hill the camera slightly jumps which can be distracting, this also happens sometimes when going through a trough. Overall it happens maybe once every 10 minutes.
A similar thing occurs less frequently but more drastic. The camera abruptly changes and I can't see the road anymore.
http://gfycat.com/AchingSpanishDeviltasmanian
These things are pretty minor and can get fixed with the rift reset pretty easily, but today I was in a race and someone bumped me slightly into the rear end. My camera jumped instantly into something which kind of resembled the chase mode camera in LFS. It also was fixed easily with the rift reset, but I wasn't prepared for that, got disorientated and lost some positions in the process.
I don't know if these things are under control of LFS or due to my Oculus camera setup or because the oculus rift is still a prototype. I don't play other games with the rift so I can not tell if this only happens in LFS.