He doesn't have any idea what he's talking about.

And its not a matter of turning vtec on or off it starts to engage and then over a couple 100 RPMs is fully engaged. No more jolts.

what exactly is vtec. what does it do and how does it do it

Its a fairly simple system. Vtec, once a certain rpm is hit (usually 4.5k rpms i think), a computer sends a signal to spray extra oil over the cams and all those goodies. I think theres something else involved but im not sure.

hmmm very interesting

uhh no.

Give me a second I'm writing my post.

The Vtec in a nut shell.

Your driving along hard and your RPMs are rising and boom more noise increased acceleration what was that...? It was your Vtec.

So... as your RPM's rise so does your oil pressure once it reaches a certain pressure a second cam profile is connected via a lockpin to the camshaft and now you have a more aggresive cam for higher RPM usage.

If you are low on oil, your Vtec system will not engage due to insufficient oil pressure.

The Wiki version below. And remember there is a difference between the old Vtec and the new I-Vtec

VTEC system is a simple method of endowing the engine with multiple camshaft profiles optimized for low and high RPM operations. Instead of one cam lobe actuating each valve, there are two: one optimized for low-RPM stability & fuel efficiency; the other designed to maximize high-RPM power output. Switching between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position. Using these inputs, the ECU is programmed to switch from the low lift to the high lift cam lobes when the conditions mean that engine output will be improved. At the switch point a solenoid is actuated which allows oil pressure from a spool valve to operate a locking pin which binds the high RPM cam follower to the low rpm ones. From this point on, the poppet valve opens and closes according to the high-lift profile, which opens the valve further and for a longer time. The switch-over point is variable, between a minimum and maximum point, and is determined by engine load; the switch back from high to low rpm cams is set to occur at a lower engine speed than the up-switch, to avoid surging if the engine is asked to operate continuously at or around the switch-over point. The DOHC VTEC system has high and low lift cam lobe profiles on both the intake and exhaust valve camshafts.

http://en.wikipedia.org/wiki/VTEC

No it stands for:

VTEC = Very Tall Engine Cooling

You get slightly annoying sometimes... do you know that. HAHA! ;)

I thought it had something to do with variable valve timing but I ruled that out because it's vtec not vvtec.

Just realized that it's an accord, not a civic.

hey need to let off some steam....... studying tooo much.

yeah and Vtech rules!!!!!

Gotchya. That is what i was told by a guy up in columbus when i almost bought a gsr.

wow that really explained it good. i have never been able to get a straight answer out of anyone. some one told me that a extra valve opened and put more gas in some one else told me it did this some one told me it did that blah blah blah. its nice to get a answer from someone who actually know what they are talking about. thanks dude

I woulda typed it my self... I actually did once for this forum but this time I just decided to use google. and I found it without having to type it all out for everyone.

I actually joined Honda-tech.com once just to tell someone why their vtec wasn't working. (Thats also my sig on there)

Its funny how little some people know about their cars.

^^ ya the guy that told me that vtec was a extra valve opening to put more gas in actually owned a vtec civic. crazy people

I got into it with a new civic si, that was a short race lol

lol