IN GAME
Set all linearity to 50 which is 1 to 1 steering ,no dead zones and 100
Saturation to use full amount of travel of what you set degrees of rotation to in profiler.
Set environmental to 10(this is the cause least amount of racket) if you set it higher you will get a lot of racket as environmental effects seem to be canned effects not calculated by the physics engine as forces.
Normally in a sim game canned effects would be turned off by the user or set to the minimum.
Overall force to 40-50 , change to suit(how strong you want the forcefeedback)
Weight 30- 40, change to suit(This changes how much force you need to turn the wheel,more weight less feeling ,
less weight lets the ffb give you more feeling of forces as they happen.)
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OUTSIDE GAME
G27 profiler settings that you need to alter
overall effects 100%
spring effect 0%
damper effect 0%
tick enable center spring
set center spring at 0%
untick report combined pedals
tick allow game to change settings.
The steering rotation needs to be 270 in logitech profiler as they tuned the ffb to match the xbox wheel.
The profiler settings need to be set in the Global Device Settings as F1 doesn't seem to recognize custom game profiles, same issue was with Dirt2
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That should get you started.