it's the scramble boost function. You can set it to raise or lower boost at the push of a button. Good for things like if you need a bit of extra power to pass someone on the highway or during a drag race if you need an extra push.
that's why during the video, the narrator said something about blowing the engine. The guy needed the boost to stay ahead but taking a chance to blow the engine
here's what Apexi says about their AVCR scramble boost fuction
The AVC-R also includes a Scramble Boost function which allows the user to momentarily raise or lower the boost level at the push of a button. Raising the boost level is commonly used when an extra burst of power is needed (ex. entering a freeway). This feature can also be used in drag racing. The driver can set the main boost level to a low setting for maximum traction then, once full traction is achieved, the scramble boost can allow the vehicle to boost full power.
thats awesome! I KNEW Mine's Skyline would spank it out 1st! **** yea! Way to go Mine's! Mine's for the win! Did I mention that Red Square love Mine's Skyline?!?!!? (thumb)
wow, what a great battle. that was one of the best races I've seen lately. I was actually rooting for Kubayashi in the red GTR, but I had a feeling Orido would take it home. neck and neck the whole way, tho.