Just wondering today as I was driving my wife's Honda Pilot. It has VTEC, would it engage the same as our S2k? ie, certain rev? It's pretty fast if I floor it considering its pretty heavy. Anyone??

 

NO... I know there is DOHC VTEC, SOHC VTEC, and I-VTEC. I know those are all different but I don't know much more about it then that.

 

I THINK that VTEC is single stage, where it only kicks in once and that i-VTEC is dual stage, where it kicks in and then does it again at a higher RPM so that you won't feel it as much. I could be wrong though.

 

Yes, VTEC does engage the same on all Hondas. In all cases a third lobe on the cam shaft (or cam shafts) comes in to play at a predetermined RPM and throttle position in order to offer optimum balance of fuel economy and high power with driveability.
The philosophy differs from vehicle to vehicle depending on the engineers

 

In some DOHC VTEC cars it feels like there are two stages of VTEC (ie: B18C1 GS-R), but that's because of the way the intake manifold is setup. It engages, then the manifold open up even further as opposed to the single stage B16A/B & B18C5.

 

My MY01 Odyssey is a SOHC 3.5 V6. The VTEC works on the intake valves only in my car and activates somewhere between 3 and 3.5k on the tach. You can tell that the engine is breathing easier when VTEC engages in this engine but it's definitely not got the kick that an S2000 has. Of course, this is a totally different application.

FWIW,
Drive Safe,
Steve R.

 

in my civic si - ivtec doesnt really do much at all

it only has a dual profile cam on the intake side that turns the engine from a 12 to a 16 valve around 2200 rpm. Exhaust is not VTEC enabled - just a regular old cam - but it is controlled by the 'I" in ivtec. All for emissions/economy.

 

dohc vtec implements vtec for both the intake and exhaust valves for longer duration and higher lift. dohc vtec is more of a performance setup, while the sohc vtec systems are aimed toward better gas mileage at higher rpm.

ivtec is great because timing is being altered continously allowing great lowend torque. also, ivtec motors are known to give good gains from basic boltons(rsx-s for example).


dohc vtec > ivtec > sohc vtec

 

Check out this site. There is nothing on i-vtec but it is still interesting. http://www.nsxprime.com/FAQ/Technical/VTEC.htm

 

no...all VTEC engines are not the same...if u guys think they are then drive ur S2K for about 5 minutes and then drive a Civic EX SOHC VTEC and tell me if they engage the same way..