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What would be the main reason for doing all this? HP, Torque, Emissions, Economy?
It's an interesting read to follow as to the methods or approach, pros and cons etc. but for someone like me with limited knowledge of finer technical aspects, I'd like to know why you would vary from the factory settings in the first place. It also makes the thread more complete as a reference.
Hello Tim,
The hot rodders and posh wannabes are always looking to "improve" things with their skills. The post unleaded fuel US 911's are detuned and advancing the timing increases power, if you have enough octane. For some models and locations, US fuels have improved since the mfg date and a small amount of extra advance helps a small amount. Porsche got it right from the beginning , but once you significantly modify the engine, remove the cat, change the intake and cam, etc. the factory spec is only a starting point.
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Paul
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