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Restriction of frequency of rotation
The absolute limit of frequency of rotation is approximately at level of 6700 rpm. The latest after that numbers of turns of a spring of valves start to fluctuate so strongly that any more do not provide faultless opening and closing of valves. Springs of valves can come off that leads to such consequences, as collision of the valve with the piston and, thereby, to serious breakage of the engine.
In order that business did not come so far, in Audi engines restriction of frequency of rotation which in case of approach to the called range of number of turns stops further accumulation of frequency of rotation by the termination of intake of fuel is built in.
So if you already had to be surprised to interruptions in operation of the engine on very high turns, know is at all malfunctions, and the built-in self-defense of the engine.
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