@ schroeder:
I haven't run much the 2008 season and unfortunately I don't have any magic datas.
The 2008 physics pack was made using the original 2002 GP4 game.
I just made it as 2008 in terms of physics and engine torques.
The good thing out of that is that you can use the magic datas of the original 2002 game tracks, just as they are.
And I mean the tracks that are still being used and their layout remains unchanged.
The fuel consumption is higher with 2008 physics but at the long run tests it turned out that it's not a problem, so it's not a "must" to adjust it.
You will need only minor changes, may be some gear ratios.
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some of my GP4 works ...