If you ever wondered how the top speed limiter worked in our cars here is a snapshot of if in a real world test. At exactly 221km/h the throttle starts to close and by 226km/h the throttle goes to 50%. The car continues to accelerate but very slowly until 230km/h. This is very different from the fuel cut top speed limiter which is usually set close to 500km/h in our cars i.e. disabled.
I also posted on Datazap :
http://datazap.me/u/brn12345/top-speed-limiter-action