VTEC Question

[Civickid0to60]

I have a DOHC VTEC engine, and I just wanted to know what VTEC actually is, and how fast do you need to be going to kick it in. Sometimes I have gone from 10mph and it feels like it is kicking in when i slam the gas. Other times it seemslike it needs to be passed 3000 rpm. Can someone help me.

[Racing Rice]

Since Im to lazy to explain it.

http://www.howstuffworks.com/question229.htm

[Civickid0to60]

haha thanks man.

[94_AcCoRd_EX]

Which engine do you have?