Eliminating the throttle body butterfly will reduce obstructions in the engine intake (breathing system) making it more efficient (in theory). Less mechanical parts also makes less parts that can wear in time. Might be a good thing.
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well throttle is not really an obstruction, just that when WOT (wide open throtttle) thus creating a ‘wait’ to for air to be sucked into the chamber from a distant throttle body, thus thus to be said a delay in response,
while valvetronic act like variable valve lift, provide ready air, as soon the valve opened to the max the air from the manifold allowed to enter the chamber in no time for each clyinder ,therefore, engine response said to be batter.
well….how batter?
perhaps as good as quad throttle (for 4 clyinder eng.for eg.).where its butterly is close to the intake valve.

efficient? well batter perhaps, since the amount of air entring is instantly calibrated by the the lift of valves for each clynder, accurately,

juat that, the whole operation is by wire and actuator a .., on a complex intake valvetrain,subjected to wear and tear too ………….this is expensiveeee,

efficiency side ….agree, but how efficient?? how much efficiency different from the normal throttle with vvt?? l/100km?, responce ,milisecond?

and ,,well its good ! does it come cheap.?

Well Paul…give us the full report then!
NST Life & Times has published its test report. Hey! Was that you in the car with Jeremy? He he…
AUTOCAR Asean does theirs in the Jan 2007 issue…so no more media embargo, right? Watcha waiting for dude?

Cheers and happy new year!

for me i choose normal throttle butterfly, preferabally individual butterfly for each clyinder, sportyyyyy. and rortyyy, (reliable i guess, imagine the one runs just by steel cable, simple mechanical stuff)

well valve tronic ,according wikipedia ,valvetronic never been used in its M car for bmw,