Quote:
Originally Posted by xntrx
It has nothing to do with lean burn, its all rpm vtec switch over dependent.
Its technically always using 16v. At low rpm, one only opens very slightly (to promote swirl and fuel pooling), so it might as well be 12v.
Once it reaches the change over (2500 for USDM), to two rocker arms are locked together and fully open. Since you've looked at 3 stage, its the same, just without the extra high lift rocker.
If you search youtube you can find some videos.
Sounds like cheap plugs/wires, or egr.
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hum... i'm just not buying this is how the vx vtec-e lean burn works. i think the vtec solinoid is active all the time sending oil to the 4th valve making it 16v mode from idle to max rpm then when your crusing and you go into lean burn when the vtec valve is disengaged to stop the oil flow to the valves creating the 3 valve setup that gives it the amsing mpg's its know for. the vtec-e in the vx is NOT for power. its for fuel economy.
not to piss anybody off here but i am truely just trying understand this system. the wiki write up is saying what was writen above. thats how it works in the 3 stage vtec.