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hopefully this helps:
http://wiki.beamng.com/Playing

im trying to find a guide to make my ps3 controller work.

 

I have a Dualshock 3 (PS3 controller) with a program called motioninjoy, and I can use it in Beamng without changing any settings, it's automatic.

 

Ive tried that, nothing happens. I really dont understand why

 

what do you mean? you just plugged in your controller, started game up and started using controller straight away?

that dosent work for me

 

plugged controller, used motioninjoy (so PC thinks it's a X360 controller) then started the game and started using the controller straight away

 

Thing is that only works if you have a Dualshock 3

 

im using sixaxis controller