Whilst not being able to provide info on the car setup issues, as I only really adjust the things in the general tab, I can definitely recommend the 2007 MMG mod, it's all I play.
The mod is well optimised, I get quite high frame rates on high detail. The physics for me are good, there are options within the game to play with striped tyres or not, and various traction control upgrades. The default traction control range is something like 10-40% I think.
I find it's most enjoyable and realistic on to play on around 80-90%, you can still get sideways a lot but not spin as easily, and you have to still make lots of corrections out of corners if you have a heavy right foot!
I can tell you how to edit this if you wish.
There are new skins to have 2008 liveries on the cars, and can swap drivers around/ edit names to bring it to 2008.
The AI aren't great, you will find the Toro Rosso's and Super Aguris winning races, but you can easily edit this within the talent files.
Find the rfactor central page and you will find answers to a couple more of the problems in the comments section.
There is a 2008 rft mod, which I also enjoyed, but for some reason I had the dreaded rfactor stuttering and gave up playing that. Haven't noticed it (fingers crossed) yet in this mod which I think is better anyway.
Hope that helps
Edited 3 time(s). Last edit at 05/18/2008 01:40PM by salvasirignano.