Yep below is a picture of the setup.
Summery: ( Some credits to Poyol ! )
For easy Money and easy EXP in A-spec so you can just enjoy online racing, tuning and buying testing cars without spending hours to get enough cash yourself: ( Or to reach LvL 40 without damaging your limited lifetime and brain itself ! )
Choose the Dream Car Championship - The first event being on the Indy course - 10 Laps.
9800 Exp and 108.000 credits in just under 8 minutes if I'm correct. ( Will check later to give exact numbers. )
Setup:
Downforce: Lowest 50/50
Rest: Default
Options:
Automatic Gearbox
Traction control - 5
Skid Recovery - On
Active Steering - Mild
ASM - On
ABS - 1
And then make sure you rig your controller and keyboard as in this picture.
The left stick is pointing to the right slightly, in exactly such a way that you still reach 400kph on the straights but you keep grinding the wall. Test it out on the track to make sure you got the stick locked in the perfect angle.
Without this last trick you will end up crashing and most likely have the car spinning against the wall for hours on end at some point and that we dont want !
Make sure you connect your controller to the PS3 or it's battery will run out of juice.
When the event is ended the keyboard with the constantly pressed enter button will make sure the race gets restarted every time.
See my keyoboard in the background of the image with a small piece of paper stuck in the keyboard at the numlock enter button.
It will act as if the x button on the controller is being pressed over and over.
Hope you got a spare keyboard with USB connection else you can't do much on your PC ( and PS3 obviously ) as like me!
So I just leave it running when I am sleeping and away from home to work, sport, work on my car, enjoy other hobbies and spend time with friends and family.
Now you can leave your PS3 running for how long as you want. Just make sure it is standing up straight for better cooling and it is not covered in dust to prevent overheating. For the rest it will be fine.
For your own state of mind you can backup your savegame every now and then. In the UNLIKELY event anything happens ( Flood, Hurricane, Power Down, PS3 dies ) you got your progress saved on the USB stick which then you have to keep safe offcourse.