Can't compare GT5P with GTR2 or any other sim. The track model is simply sub-par interms of details and I am NOT talking about visual. Anyone who actually drove on the in roads of Daytona can tell you GT5P is far far far from reality interms of the road surface.
But none of this is even relavent when we don't even have tire wear and tire temperature. I am always intrigued when people try to compare the cars in GT5P to "whats real" when huge chuncks of physics is literally missing from the game, the car and the circuit.