Vtec Problem...

[Rehaan Khan]

i cant hear the vtec sound, when i bought da car everything was workin jst fine vtec was roaring n stuff after certain rpm...(think 4,500rpm) but now cant hear anything...can anyone help me plizzzz....thank you

[shadou]

it fell off most likely.. loose connecting to the solenoid ? not enough oil, ect can all lead to vtec not engaging I think there are plenty of threads covering it, check your oil first.

[Rehaan Khan]

i checked all those but still its not engaging, my oil level is jst a bit up than the required level, u think that mite be the prob. jst cjaged the oil 3 days ago...wat ya mean threads covering it???

[JasonGilholme]

he means the same question has been asked before.

use the search button and you will find your answer.

also, type the whole word. not jst hlf ov it.

[imratedpg]

The VTEC pressure sensor is basically an oil pressure sensor. Insufficient oil pressure, low temperature, a faulty switch, a plugged or faulty solenoid all could cause no VTEC.

Check your oil, make sure you're up to temperature. If VTEC doesn't work, check your wiring. After that, get a manual and start making your way down the trouble shooting list, and it wont matter if ur oil is just abit over the max lvl it shud be fine.

[Rehaan Khan]

thxxxxx buddyy...

[Shraka]

Your VTEC should switch into high cam at about ([S]6,500rpm[/S]) 5,800rpm, not 4500. If you have a VTIR, at (4500rpm) 4000rpm your VVIS opens for slightly more airflow.

[Shraka]

ppl say vtec is at 4500 and then the second butterfly opens at 5800 but i think its the other way around

It is. You can hear it when you run it on the dyno. It sounds quite moderate up to 5800rpm, then you get the VTEC swap onto high cam, and it suddenly gets a deep voice.

You can see quite clearly on my dyno results when the first cam starts to run out, and it switches to the second. The torque picks up right away:

http://www.artema.com.au/void/stuff/...ate=View+Chart

The VVIS is the same concept as Toyota's TVIS. Toyota uses it purely to provide more low end torque to an engine that is tuned for high rev performance.

Also, above, I got my RPMs mixed up. VTEC comes on at 5500-6000 rpm, while VVIS opens at around 4000.

[VTec1987]

Been covered so many tym with integra vtir motors with dual stage IM
Vtec comes first then secondary butterflies, u can hear it better at 5800 doesnt mean its vtec.

Y dun you hook up a light bulb to ur vtec switch and see when vtec kicks in

[Rehaan Khan]

srry guys i had the crome intake pipe thats y couldnt hear the vtec...now i got my stock induction pipes n can here em' roar....thxxx everyone...can someone give me some rep points pls...i wanna sell some items...thank you....

[Shraka]

Been covered so many tym with integra vtir motors with dual stage IM
Vtec comes first then secondary butterflies, u can hear it better at 5800 doesnt mean its vtec.

Y dun you hook up a light bulb to ur vtec switch and see when vtec kicks in

Every reliable source I've ever consulted states that VTEC comes in at much higher revs than that.

If you look at the link I posted you can quite clearly see where the cam switches over.

[Webby_roller]

Every reliable source I've ever consulted states that VTEC comes in at much higher revs than that.

If you look at the link I posted you can quite clearly see where the cam switches over.

Hey, i will have to do some searching at a mates house, but he has a h22a vtir, and the dyno sheet looks similair to yours.

The vtec comes on first, then secondaries come on second, the reason there is a greater increase at the point of the second switching point is that there is more air getting into the intake manifold, more air, more power....

more open area in the intake manifold, the less resistance for the air to flow through, the more power it will make....

Plus there are alot of respectable websites that show stats for honda motors and the vtec in a vtir is 4500, and secondaries at 5800....