I was going to say the same thing, you need to be in the car forum or, more specifically,
http://www.rcuniverse.com/forum/rc-e...gies-more-147/

Now that that's been cleared up, it's time to look at your motor questions. I'll try to keep it as simple as possible based on what I remember.
As far as the numbers go this is what they mean:
1) 540 This is a physical size designation. The higher the number, the bigger the physical size. This means, for the most part, that if you want to upgrade to get more speed, you need to verify the motor chosen is in the 540 size class.
2) 13 Turn This one is a little more complicated. The number of turns is what controls your motor speed and torque, along with the applied voltage. How this works is harder to explain since there are variables that I don't want to get into so, here goes nothing:
A) The number indicates how many times a wire was wrapped around the arms of the armature, the part inside the motor that actually spins, in most motors anyway.
B) The power of the motor is controlled by a magnetic field, generated by electricity flowing through the coils. This means that more electricity or more coils will produce a more powerful magnetic field.
C) The larger the magnetic field, the more powerful the motor will be since the magnetic fields created by the coils push against other magnetic fields produced by actual magnets. A 9 turn motor, for example, will normally have considerably less power than a 21 turn motor.
D) Now comes the fun one that can really screw you up. The magnetic fields created by the coils is not continuous. Electricity is supplied to the coils in short bursts, through contacts in the case and armature. The magnetic field actually grows starting when power is applied. When the armature spins past the contact point, the electricity stops and the field collapses, allowing the coil to pass the next magnet before the field reforms at the next set of contacts.

I hope that helps. Electrical theory is something that most people never grasp. If the concepts I've talked about help you, great. I've avoided talking about timing and many other things because they are not relevant to the question and would just overload you with information that is better learned first hand from someone that really knows the ins and outs of electric motors. Welcome to the forum and good luck with your truggy