What exactly is the overboost function on the 911 turbo?

Soldato
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I noticed that "overboost" was an option for the 911 Turbo, and reviews have mentioned it quite often, but what exactly does it do?

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Basicly the ECU will raise the maximum boost for a short period of time if you have the throttle wide open. I think in the Porsche this is only enabled in "sports" mode.
 
Even with a conventional, torque-converter automatic, it's far from straightforward to extract the ridiculous numbers that the Turbo is capable of. First, remember that the latest Turbo has an overboost mode—it ups boost on the 3.6-liter flat-six by 2.9 psi, increasing torque from 460 pound-feet to 505 for 10 seconds when the dash-mounted "Sport" button is ticked and the throttle is pinned—so, to get the best launch, the brake torquing must happen with your right foot all the way to the floor.

http://www.caranddriver.com/shortroadtests/11980/2007-porsche-911-turbo-tiptronic.html
 
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