Very useful topic in my view. But also, there´s another characteristic that should be taken into account: the turning radius. Speaking about Dirt Rally 2.0- take an R5 car and turn to full lock - the circle it describes is way too small, R5 cars don't turn that much (neither WRC cars) - so in this respect, if you drive an r5 car with 900 degrees of steering is actually more realistic if you don't turn the wheel past 540 or something closer (might be 450 for ex.) - than if you drive it with 540 because the car is turning way too much compared with reality.