Originally Posted by Dr. Isotope
VTEC engagement is variable-- I kick in between 5200-5400 on most occasions. It's not as fierce in the single cams, but you can feel it-- you should at least hear the change in intake sound...
This is true as no two engines run exactly the same. The slighest difference in STP (standard temperature and pressure for you non chemistry buffs) will make a signification impact on VTEC engagement.