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In Sport or Sport Plus modes, when you lift, the computer quits sending fuel pulses to some - but not all - of the cylinders. The remains cylinders continue to keep the turbines spinning...
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So it's vaguely like an Antilag system in that it uses fuel, but it is much less harsh since the fuel is igniting in the cylinders as normal. Yes?
http://en.wikipedia.org/wiki/Antilag_system
This begs the question: if such a simple solution is possible, why hasn't it been implemented long ago? We need more details. I am also curious how this effects the feel and behavior of the car when active. I.e. does the car seem to decelerate at a lower rate than you would expect? For that matter, can you feel the system disengage?
Also I notice this is only for the more aggressive modes. I wonder if it will mean that they will state fuel efficiency and emissions numbers without these systems in the mix.
Interesting though.