Car flips when it turns

I have made a car that drives when you use the arrow keys. Everyhing works great except that it flips when you turn even if you are going at a relatively low speed. Is there any way that I can make a lower center of gravity for the car, or maybe make it more balanced so it wont flip?
Steve

Nevermind, I just changed the y value to 0 and it works. Thanks for the help.
Steve