Vehicle instability

how to stop the vehicle from flipping over… ti am keeping the center of gravity at 0,1,0 ,setting friction slip at 10f and restitution at 0.001f but still the car flips over…how can i achieve stability at top speed…
p.s. i am aiming for a rc car type vehicle.
thanks in advance

Center of gravity at 0,1,0 would be above the car, no real wonder it would fall over?