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its not turbo lag, EcoBoost engines were designed to eliminate Turbo lag, its quite a clever set up actually. We're all familiar (somewhat) with how turbos typically work, the difference for EcoBoost is direct injection. The fuel pump shoots fuel directly into the combustion chamber instead of into the intake port as usually. By doing it this way you eliminate waste, notice how EcoBoosts don't have the typical wastegate WOOSH.

the result is low end torque and elimination of lag.

the sport mode in the MKZ simply ups throttle response and keeps the necessary revs on tap longer..
Without the wastegate that is why the ecoboost engine sound the way they do. Good definition of it though zep.
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