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Don't think anyone said that turbo engines NEED low compression. It's just a fact that higher compression allows less boost. And since power is a function of boost, then when you run compression too high, you have limited power. For any combustion chamber/cam/exhaust/etc, there will be a limit- fuel has its limits, too, so you can just keep pumping up the boost, and adding octane. Power is actually a function of the mass flow of air/fuel, but in practical terms, you only have a few choices to increase that flow, and boost is one. Others are rpm and cubic inches. If you want to turn 8,000 rpm, then you can use less boost, more compression. Mm, how much would that cost????
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George W
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