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Originally Posted by ???
Oh ok. Thanks everyone for clearing that up. What is an ideal temp? How does AFR affect temps? Where should the sensor be placed?
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Most turbos can handle between 900-950C at the turbine inlet, sometimes more. Even then, it's hard to quantify how quickly damage can occur. Catalyst start to degrade when the brick temperature inside gets over anywhere from 850-950C. Now when I say "degrade," it means accelerated aging, something that you wouldn't easily experience on the street. Exhaust valves also have limits, but a lot of that has to do with cooling at the water jacket too.
If I had to give you a number to try and avoid, it would be anything over 900C/1650F , but as I've pointed out it still depends where you want to measure it.
It is very difficult to establish a correlation between EGT and level of knock in the engine. As it is, it can be difficult to establish a correlation between the knock sensor signal and actual knock in the engine when you are in light/borderline knock operation.