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I'm not exactly sure what you're asking, but there are three possible ways that a car can reach its top speed. It can be electronically, drag, or rev limited.
An electronically limited car means that the onboard computer will not allow the car to be driven above a certain speed (155 is a common limit in German cars for example). The ignition or fuel is cut if you try to accelerate beyond that point.
A rev limited car is geared such that you can reach redline in the highest gear. You could go faster than that, but it wouldn't be very smart to do so. If the car has a rev limiter also (most modern cars do), then you actually would be prevented from overreving the engine by an ignition or fuel cut.
A drag limited car has a top speed limited only by the engine and aerodynamics of the car (the gearing also plays a part). You can put the pedal to the floor, and eventually the car just won't go any faster.
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