* Engine limitations: The engine's power and torque output ultimately determine the highest speed the vehicle can reach. Once the engine reaches its maximum power, further acceleration becomes impossible.
* Gear ratios: The transmission's gear ratios dictate how engine speed translates to vehicle speed. High gear ratios will result in a lower top speed.
* Aerodynamics: Air resistance increases significantly at higher speeds, acting as a major limiting factor.
* Tire size: Larger diameter tires will result in a slightly higher top speed for a given engine speed, while smaller tires will have the opposite effect.
In short, while there isn't a dedicated speed governor to electronically cut off speed, the vehicle's inherent mechanical and aerodynamic limitations naturally restrict its maximum attainable speed. Any perceived "governor" is really just the overall design and capabilities of the vehicle.
