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There is no particular moment when the turbos "kick in". They are always rotating as long as the engine is running and producing a slight positive pressure between the turbo and throttle body (or the back of the intake valves for a valvetronic engine).
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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