Yea, I'm a mechanic too. There is some co-relation between the game and real-life, but it helps to remember that in the game, everything is sterile and invariable. Cars & the motions they make follow Earth's laws of physics to a point; but eventually, it helps to realize the game has its own laws that are bastardized versions of EArth's. There are no oil slicks on the road. No pebbles. No heat. No track debris. Tires wear in a linear manner. Cars can't flip over. You might find that perfect set of settings in the game that'll work from track to track. In real-life, this wouldn't work because there are so many unseen, spontaneous things that can come up. And so on....
I'm not saying anything you haven't thought before. GT4 is basically like an encapsulated version of real-life...realistic to a degree within the bounds of Earth physics, but eventually not the same. STill, within that 10% of similarity, it certainly DOES help to use Earth-car physics as a reference.
....jeez, I'm starting to sound like Mr. Spock.
