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A static compression ratio of about 8:1 is a good compromise for noncomputer-controlled engines running on premium pump fuel. More power is available by reducing compression to 7:1, but the engine won't be as responsive at low rpm when not under boost. Static compression ratios above 9:1 typically limit boost and max power potential.
Take Charge - Engine Supercharging

A static compression ratio of about 8:1 is a good compromise for noncomputer-controlled engines running on premium pump fuel. More power is available by reducing compression to 7:1, but the engine won't be as responsive at low rpm when not under boost. Static compression ratios above 9:1 typically limit boost and max power potential.  View Related Article

 

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