they do the same thing in theory, vtec is a simpler and arguable more effect way of handling a variable valve timing system. vtec enguages at a certain RPM using a kind of OP switch that drives a pin. vanos allow for far more adjustablilty and a smoother powerband, but its also less reliable.
Nov 2, 2009
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Is VANOS the same as VVTI?
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Jun 7, 2014 · From my understanding VTEC only comes on at a certain RPM number and Vanos is continuous and is always working throughout the rev range.
Oct 3, 2016 · VTEC (Variable Valve Timing and Lift Electronic Control) hydraulically selects between low-lift lobes for when the engine is rotating slowly and ...
In theory, Vanos is technologically more advance than VTEC. However, VTEC wins in terms of bhp/litre and can rev higher. Fuel consumption wise I'm not sure.