here letme tell u a little about vtec
Stage 1 - VTEC-E
An implementation of VTEC for economy, it turns off one intake valve per cylinder in the 16-valve engine, and attains lean burn mode. The lean burn mode gets the air to fuel ratio above the 14.7:1 stoichiometric ratio and thus enables extra fuel saving. This can lead to km/L averages of 30(approximation depends on special maintained envoirment) if driven at a constant speed of 60 km/h.
The VTEC-E mode engages in the D15B from 0–2500 rpm.
From 2500–6000 rpm, the VTEC-E mode turns off and all of the engine's intake valves are used. The engine is now like any other normal VTEC engine when the VTEC isn't 'on'.
Stage 3 - VTEC
From 6000 RPM (up to rev limit) the engine's VTEC wild cam is engaged, increasing performance and giving boost at 7000 rpm in the D15B
[U][I]Stoichiometric ratio refers to the optimum theoretical mix of fuel and air to achieve complete combustion of that fuel. Sometimes called stoichiometric air ratio.
Alternative spellings, stoicometric, stoiciometric.[/I][/U]