Welcome to the forums, rolfi. The maximum you can turn is 360. and it would struggle to reach that speed because of the weight of the 9 volt battery. See, the 9 volt weighs 3x the weight of the car, and with that weight, you can say "flip" as soon as you make your car turn. sorry bud, but 9 volts won't exactly do the job....
And, I don't even see how it could fly into the air WITH THE EXTRA WEIGHT. lol