Stinger GT thermal problems with Vmax?

Good morning, yesterday for Sunday I am on the motorway from one exit to the next. Because the train was free, I was able to test how far the Stinger was ready to speed up. At first a slight climb went up, after that the motorway fell off slightly (A4 between Siebenlehn and Berbersdorf in the direction of Chemnitz). The Stinger accelerated first without murmuring until about 265. Then the slight slope came and he moved on until 274. Here it seemed to me that the Stinger The speedometer stopped and the speed went back. There was no more propulsion. I then went off the gas very easily and the speed fell abruptly to approx. 235. I then went down at the next descent and still about 5-6 minutes on the country road to the finish. After turning off the fan then ran with enormous noise and turned for about 10 minutes at high speed. What are your experiences with the Vmax? K someone has been driving for more than a few seconds with beyond 270 km/h? Did you also have the feeling that you will be electronically slowed down at about 274? Perhaps the Stinger gets thermal problems at this speed and then throttles the performance. At 13 degrees yesterday it could not have been due to the temperatures. I noticed this behavior once a few months ago, there was also at 274 end and he obviously has power away n. At lower speeds up to 250 km/h I have not yet noticed something like this. Only the fan has then also spoken after the end of the journey.