Unfortunately I didn't notice from your profile that you have 120 hz monitor (BenQ XL2420T). Input lag should not be a problem at all if your system can deliver 120fps game play. When I read you reply it makes me to believe that you can be able to play locked 120 fps with your system if you are using Nvidia driver 353.30 with SLI Compatibility Bits: 0x02D04005(LEGO Batman 2, etc)and if I was you I did give it a go.
Download 353.30 :
http://www.nvidia.com/Download/Find.aspx?lang=en-us
Download and make clean install with Display Driver Uninstaller :
http://www.wagnardmobile.com/forums/....php?f=5&t=273
Nvidia Inspector > rFactor2 profile:
SLI Compatibility Bits > 0x02D04005 (LEGO Batman 2, etc)
Maximum pre-rendered frames > 1
Power management mode > Preferer maximum performance.
Important:
Do only this don`t mess with other settings
UserData > player folder and open player.JASON file and edit:
"Max Framerate":120,
"Max Framerate#":"0 to disable (note: positive numbers only, we always use the 'alternate' method now)",
"Texture Sharpening":0,
"Texture Sharpening#":"Sharpen textures using MIP LOD bias - 0=Off, 1=+2.0(very blurry), 2=+1.0(blurry), 3=-1.0(sharp), 4=-2.0(very sharp), 5=0.0(auto)",
rFactor2 video settings:
Mode > Fullscreen
Anti Aliasing > 3-4
HDR> on
Inn Game > Options > Display:
Circuit Detail > High
Player Detail > Full
Opponent Detail > High
Texture Detail > High
Texture Filter > X8
Special Effects > Full/High
Shadows > Low (This is FPS killer #1 in rF2)
Shadow Blur > Off
Soft particles > Off
Rain Drops > Yes
Road Reflection > Off (Off gives better fps)
Environment Reflection > Off (Off gives better fps)