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Originally Posted by ricqik
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As it turns out, the explanation boils down to an engine calibration strategy. GM calibrated the 367-hp 6.0-liter V8 to remain in stoichiometric "closed-loop" fuel delivery mode for 4 seconds after the throttle is floored. This fueling strategy helps keep emissions in check (and saves fuel) at the expense of reduced power — about 40 hp less at the peak.
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Seems to me this is just a fancy way of saying "torque management to reduce stress on drivetrain parts." Thankfully there is software out there to tune it the way it "should" come from the factory. Now GM just needs to work on replacing the 4 speed auto with a more efficient 5 or 6 speed auto.
