Nonsense! 
Complete gobbledegook. 
Hi,
What voltage will you be operating the car on?
If its higher than 5V, then get a DC-DC converter JUST for the controller, that takes what ever your main battery voltage is and converts it, efficiently, to 5V.
Tom... 
why do i want to convert it to 5v as the arduino takes up to 12 v
Because the linear regulator on a Nano is tiny, and should really only be used to power the chips that there are already on there and no additional stuff. So you'll likely have to have a 5V and/or 3.3V regulator somewhere anyway, and you might as well use it to power the Nano itself as well.
but if i used the 5v only to power the arduino the other stuff wont be powered right?
If you don't connect the 5V of the arduino to anything else then you'll likely get away with it.
Btw, I havent touched on the issue of safety, but if you're building a vehicle, please keep in mind that its electrically a complex and hostile environment and that automotive engineering guidelines exist for a reason. I'd be hesitant to put an Arduino into a car except maybe for very non-critical stuff (and even then with great hesitation). It's not an automotive grade device and not engineered to be used in such an environment.
its a robot not a real car .. and every one uses arduino for making robots so how its not the environment
When you said you were making a car, it wasn't clear to me you meant a robot. If you give complete and accurate information, you generally get more relevant replies.
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