Valve damage

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#1
Original: German · machine translated
==References== I have a 6-speed switch with cylinder head machining and a 6-speed switch. Chip.
Before 8Tkm everything was made new on the engine. with the chip I can turn the V8 to 7000U/min (without it torturing itself.)Deactivate it at 7140U/min.In the limiter I did not have it yet. It has also run perfectly, but then a valve has been torn off at 280km/h. has torn the timing belt.Does anyone know until how much U/min the V8 is speed-proof? Where do I get reinforced valve springs? At Audi I have already asked but so far no answer.
I'd like some information.
Greetings, Jürgen!
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