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Originally Posted by Irace86.2.0
I don’t think this is a factor. It is more of a product of the trade off of lower compression and higher boost motors versus higher compression and lower boost. Higher IATs are bad, but higher compression creates higher temps, so 300hp is 300hp, no matter where the temps originate. There might be an argument for better manifold air velocity with colder IATs, but I would have to see the data. The bigger differences are at the low end—not the high end.
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That's just not true. Higher compression does not create higher IAT's at all. IAT also doesn't directly dictate combustion temperature or EGT either. If you're getting at heat generated by compressing the mixture you have to remember that the turbo is compressing air alone, the piston is compressing air and fuel and it won't react the same.
Higher IAT's do make it a lot more prone to detonation though.