I have no idea what you are talking about a turbo ups your compression ratio and the way all the formulas come out the final compression ratio is like 20 to 1 at full boost but my math could be wrong i have screwed it up in the past lol. All a turbo does is force air into the engine upping the atmosphere pressure which in turn ups you finalcr at full boost depending on how much boost you plan to run for your horsepower desires.