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Turbo Boost 101

Engine

Vehicle Information: Year: 2002; Engine (Size, Modifications): 3.6; Total Mileage: 1000;

I know a turbo gives me more power and I pretty much know the difference between turbo and blower but I don't know how and why it is controlled? I see my boost pressure move from zero to .6 and back to zero as I accelerate up to highway (and above speeds). What controls the amount of boost and why does the boost drop off as I reduce acceleration?

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