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as probably already stated vtec is a methos of adding some type of performance to an econobox car.... the reason vtec works is there are 2 distinct cam profile, that the car can choose from, the car bases this choice on RPMS.... one side is a VERY mild economical cam, and the other is a SLIGHTLY more aggresive cam, the car crosses over at such a high rpm (4800 + depending on model) so that you the driver gets the benifit of fuel economy, but can stil PUSH the car... if you were trying to accelerate you would stay in the gears longer (thus driving more aggresively) and you would reach that more aggresive cam... this is a VERY basic explanation.. there are a few other factors that determine if the car can engage vtec (oil pressure, engine temp, etc...) EVEN from a performance stand point (with a VAFC or similar unit) you would gain NOTHING by droping it so low, IN FACT you would probably damage the car..
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