From what I've seen you can only tune your car if the Computer is turned on, not that you can race with them on the custom track...
Also it is impossible to set 4-4-4(engine, tire, steering), right?
An optimum for me is either 4-2-0 or 4-0-3...
Also since I've add tuning my best time has improved for a second...
Damn you Timpsi I can't stop playing this game...
