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I have an EX 2004 model and I was just wondering something about VTEC. I've never been in lets say a 6th generation Civic where the VTEC was actually noticable as they say. So I don't know what I should be expecting. And I read all the time that our VTEC is not very good.

But I'm just wondering if it should at least be noticable, through feel or sound. I've been driving this whole time not knowing what VTEC was supposed to feel like. And I always read, "It's screaming at VTEC." The reason I'm asking this now is that there have been a couple times where I was shifting in the high rpms and all of a sudden, I notice a change in power and sound. It has usually occured sometime after 4500 I'd say.

So is there something wrong with my VTEC? Because it doesn't do that all the time. Maybe out of the whole year I had it, it's done that maybe three times. Or is it really not noticable and I don't have to worry about anything? Any responses would be appreciated. Thanks.

PS: Whenever I think I felt VTEC, it happened to be raining on those days. Or at least the floor was wet.

 
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Yeah, sounds like you have a class 41 VTEC failure: Improper VTEC engagment and power increase. I would take it to Honda and they should be able to assist you.

 
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VTEC is the climax in the women's orgasm.

 
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Ohh, I see. Thanks a lot man. I figured that something might be wrong.

By the way, I have an AEM V2 installed. Would that prevent them from helping me because I did something to the car?

 
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nothing is wrong. the newer engines don't have a vtec you can hear (they corrected that), and you shouldn't even really feel it either. It makes the power band smoother.

 
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Ohhh, I see. Thanks a lot gearbox.

 
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yeah.. you shouldn't hear anythign at all. What you hear/feel around 4500 RPMs is the engine getting into it's "sweet spot" so to speak. it when the intake valves open at the rate in which it takes sound to travel down the intake runner, bounce off the pelum and back down the runner cause a slight bit of compression of air hence giving the motor a little extra kick, that's it, VTEC was engaged long before that hapens though.

 
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Sounds like the it's the peak torque at around 4500rpm and the power band takes over...That you will feel it...

But I am sure the "sound" is a little different than non-VTEC, at least a little louder than an LX.....lol....

 
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When I had my AEM V2 CAI on, you could only slightly here the VTEC kick in, if you didn't know what RPM to listen at you could easliy miss it. Yeah, the engine is louder, but I suspect that is partially do to the fact to goes to a higher RPM, which of course means you need more air, so in short yeah, it does make a different sound, but it is not directly linked to VTEC kicking in IMO.

 
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I got an Injen CAI (now using upper part only), and have sound change at 2500rpm WOT....

BTW, when I was driving a Lude, setting the VTEC point down at 3500rpm doesn't change the sound alot either....I think we have to realize that most of the VTEC "roar" we hear is from Intake Air Bypass, not directly VTEC (parts of VTEC but not necessarily in VTEC system, and vice versa)....I compared the sound from a Vic SI with a Lude and the difference is noticible (B16 doesn't have IAB)....Same as some older Accords, like 88/89 LX-i and some 90-94 EX, at 5500rpm the IAB switches to short mode and you will hear some noise like VTEC, but it's not....

 
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If you want to hear what ppl are talking abotu when they say vtec was screaming....have someone give you a ride with a h22a or a b18c5 and listen to that vtec cross over

 
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you should be able to feel it.. it feels like the engine is accelerating without actually pushing the gas pedal. like it speeds up by itself almost and starts to feel very smooth.

 
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vtec engages at 3 rpm's

 
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my B18C1 will show you, but then agian I think any engine that can go to 8000 RPM's screams.

But those engines are performance engines, the D17 is an economy engine, ment to be much smoother

 
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yep i was gonna say the vtecs are different on like a gsr integra dohc.. then a sohc economy civic

 
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ya there is a sound change where it becomes throatier after 4200 rpms, but thats not vtec. Actually someone here did tests with a multimeter and found that vtec will only engage under the following conditions:
-car is at operating temp
-oil pressure is at a certain psi
-car is above 4500rpms
-gas pedal is at 100% throttle

only then will the vtec solenoid actually change the cam profile.

 
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http://www.7thgencivic.com/forums/sh...d.php?t=188161

No study, straight from the Helm manual, but I think it get the point.

 
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Are you sure it is 4500rpm/100% throttle and car at operating temp for our Civic? I don't think so....I also used multimeter to check my VTEC wire and even the engine is at absolute COLD (just started) with 50% throttle and at 2500rpm voltage changed then keeps constant....The only thing is that it must be above 10mph (1st gear 2500rpm, right?)

 
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if the throttle isn't 100%, the solenoid won't engage bc the output voltage is too low, as measured by the tps.