Clips are ok. They do not have to be run on a track to see if they work. You do not need a car to test them. Each brand of esc will need a seperate "box" which would cost more than some esc's are worth. If you don't have any interest in running rc cars then all your time and money are being wasted. You won't be able to resell them until you can gaurantee they work, are you willing to do that? buying a car and testing them is a dead end.