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I think it retards (or advances) the intake cam timing at a certain RPM to either increase torque on the high end while keeping emissions low or something. The more I type the less credible I sound (heh) but I do know for a fact that it has something to do with changing the timing of the intake cam at a certain RPM. That's for sure.
 

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Cone Dodger
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okay.....

vvl is almost like vanos, and dual vanos, vtc=single early vanos...on/off, oil pressure controlled, kicks in at about 1750 rpm's, and stays on up until about 6600rpm's gives better pick up but lacks higher end.........i wrote about this in some other thread about intake valve timing...........
 
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