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Old Mechanic, don't even bother. I explained it on his other thread and I guess it wasn't what he wanted to hear. So he started this one.
Just because I am nice i will give the OP a few more things to chew on since his last post still shows how confused he is.
1)vtec is a mechanical solenoid. When the ecu activats it, it switches from 12V to 16V. Don't expect it to throw you back on your seat, it is meant to be a smooth transition, especially in a SOHC vtec-e motor. It is not a turbo kicking in!
2)Lean burn mode is a change from stoic to a lean mixture. If you don't understand what that means, look that up first.
There is no corrolation with the vtec engagement and the lean burn mode so stop trying to tie the two together.
straight from wiki:
VTEC (Variable Valve Timing and Lift Electronic Control) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. The VTEC system uses two camshaft profiles and hydraulically selects between profiles.
Lean burn refers to the burning of fuel with an excess of air in an internal combustion engine. In lean burn engines there can be 65 times as many air molecules as fuel molecules, yielding an air–fuel ratio of 65:1. The air–fuel ratio needed to stoichiometrically combust petrol, by contrast, is 14.64:1. The excess of air in a lean burn engine combusts more of the fuel and emits fewer hydrocarbons. High air–fuel ratios can also be used to reduce losses caused by other engine power management systems such as throttling losses.
One may be a requirement for the other, but not the only requirement, so you could be in 12V and not in lean burn!
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