Alright, may sound like a lame question but I have a 98 Accord EX with the F23 VTEC engine and for the life of me I cannot tell when VTEC engages. Now, my friend has a 98 Civic with a VTEC engine and I can definately feel when his kicks in. Could it be that mine doesn't engage at all? Or maybe it's just a smooth *** transition on the 6th gen?

Also, some say that the engine has a deeper sound when VTEC engages....I don't really notice anything. Then again, I have I/H/E

 

i dont know abot an i4 but the vtec on my v6 kicks in around 3.5-4k rpm

 

vtaaaaaaaaaak....

*sigh*

This has been said over and over again.
So what determines when vtec kicks in? Depends on several factors

 

I think it is supposed to kick in around 5k or something. I read that low oil pressure will make it to where the VTEC doesn't kick in. But my oil pressure should be fine....there are no leaks or anything at all. I don't know where to get the VTEC solenoid but that should be OK? Maybe because my tranny has been bad for a while so I can't feel it?

 

I gotta 98 accord LX with the same motor... it kicks on at 5 or 5 n a half... but in single cam motors you're not gonna tell very well... what I've noticed... is that it starts to get loud when you hit vtec... it's not like in b series though... it's kinda a smooth constant sound it's not like a big jump in sound but after a while you'll know... also note that you're throttle has to be more than half way in for it to kick in.. jus hit the gas to floor n then at 5 it should start getting loud specially if you have a short ram or cold air... you'll hear it...

 

I feel like I've said this a hundred times -- This motor has a variable VTEC engagment point, which is anywhere between 2300 and 3800 rpms.

 

When everything is flying by super fast like in star wars warp speed. You are in Vtec.

 

I've always been able to feel it, in both my Accord with I/E, and my dad's stock '99 Accord EX. Even stock, I can sense a deeper tone.

As to your transmission problems, I've never driven a manual tranny car with VTEC, only automatics. When you floor it, do the RPMs increase steadily to redline if you keep your foot down, or will you feel something else quickly engage?

 

This is only model specific for the accord, it's SLIGHTLY different for Civics, etc.

I thought everyone knew how vtec worked? Well, anyway...At about 4000 rpms, wings expand from the doors, your muffler turns into a rocket booster, and blue flame shoots over 20 feet behind you. That's only stage 1 vtach too. I just found stage 2 on ebay a few mins ago.

 

When one person in the car says "VTAAAAAAAAAAAAKKKKKKKKKKKK"

 

My non-VTEC SOHC F22B2 feels as though it has VTEC.......I know why mine feels like it has VTEC....it's because the cam is set for optimal hp and tq within a certain RPM range. With slight mods like headers, SCAI, 68mm TB & intake and 255cc injectors my non-VTEC hits imaginary VTEC at around 3700-4000. and it is very noticeable in my SOHC motor......... maybe the F22B1 SOHC is set so that VTEC engagement is less noticeable but more efficient????

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accord95vtec &raquo;</TD></TR><TR><TD CLASS="quote">I've always been able to feel it, in both my Accord with I/E, and my dad's stock '99 Accord EX. Even stock, I can sense a deeper tone.

As to your transmission problems, I've never driven a manual tranny car with VTEC, only automatics. When you floor it, do the RPMs increase steadily to redline if you keep your foot down, or will you feel something else quickly engage? </TD></TR></TABLE>

I was driving with an automatic....the tranny is dead now so I'm swapping it over to manual. But maybe I just never paid much attention to it....I agree that it won't sound like a B16, but I should be able to notice it a little I would think.

And hurley, stage 2 VTEC is old news...my friend just converted his into a stage 4 VTEC...it turns into a space shuttle and next thing you know, you're eating moon cheese with Neil Armstrong. LOL

 

when my sohc f22b1 engine's VTEC kicks in....you feel it and hear it. im not too familiar with the components of the VTEC system but i know my friend had to have semi-serious repairs on his because one of components was not functioning properly. sorry that really isnt much help at all...maybe someone more knowledgable would know of which parts tend to go.

 

Please, someone post the link to the video of the guy sitting in his garage doing the engine noises for a supra then the civic... when he's doing thd civic he does VTEC and they flash it on the screen, its hilarious!

As for VTEC kicking in, I find it rather obvious myself. The engine starts to growl and you can hear the more aggressive timing profile.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cliffsta &raquo;</TD></TR><TR><TD CLASS="quote">Please, someone post the link to the video of the guy sitting in his garage doing the engine noises for a supra then the civic... when he's doing thd civic he does VTEC and they flash it on the screen, its hilarious!

As for VTEC kicking in, I find it rather obvious myself. The engine starts to growl and you can hear the more aggressive timing profile.</TD></TR></TABLE>

http://videos.streetfire.net/t...6.htm

as for feeling it kick in on the F23, this is total crap! you cannot feel it kick in! you can not hear the timing change!

if you feel something in the 4-5k range, that's just a peak in the torque curve that you can feeling pulling you through.

if you do want to know when it comes on, do this:

https://honda-tech.com/zerothread?id=1869866

it's WAAYYY sooner than you think. everyday driving it's comes on just over 2k and you can't feel anything at all. even if you drive like a granny up to highway speeds and shift at or before 3k, i bet it comes on in 1st, 2nd, and 3rd.

 

It depends on a few factors...

 

It is all variable. You do not feel it because it has no set engine speed. It goes off factors such as engine load, and things.

 

yo, that kid is totally faking.... you cant race with the e-brake up

 

for all the doubters out there i finally made some vids.

car: 99 accord lx, sedan, 4cyl, f23a4, 5speed

first one is fairly slow acceleration through 1st, 2nd, 3rd, and 4th gear.
near the end i get vtec to come on as early as ~2300rpm's (4th gear, 1/4 throttle).



in this vid i tried to get vtec to come on as late as possible. this was just
enough throttle to keep the rpm's going up and it came on at ~3800rpm's.



and the last one is a run from 0-60 or so. WOT, redline to redline, just to
show that under hard acceleration VTEC is always going to be on. even
at 1/2 throttle and shifting at 4k i bet it will always be on until you start coasting.



i know in other motors the engadgement point may be slightly different, but
on a SOHC configuration i doubt you can feel it come on.

 

xluben: Thanks for posting that link, I love that video!

And you may be correct, it may be the peak torque point for this motor (i don't know much of nothing about 4-cylinder OHC FI PDQ FBAR, etc) motors, but I definately can notice the engine get louder and really pick up around 4K.

Then again, I'm not used to turning 4K... just look at my other vehicle

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GhostAccord &raquo;</TD></TR><TR><TD CLASS="quote">My non-VTEC SOHC F22B2 feels as though it has VTEC.......I know why mine feels like it has VTEC....it's because the cam is set for optimal hp and tq within a certain RPM range. With slight mods like headers, SCAI, 68mm TB & intake and 255cc injectors my non-VTEC hits imaginary VTEC at around 3700-4000. and it is very noticeable in my SOHC motor......... maybe the F22B1 SOHC is set so that VTEC engagement is less noticeable but more efficient????</TD></TR></TABLE>

What you're describing is simply known as a "power band" I took my imaginary RWD 500 hp accord out for some racing last night....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accord2021 &raquo;</TD></TR><TR><TD CLASS="quote">

What you're describing is simply known as a "power band" I took my imaginary RWD 500 hp accord out for some racing last night....</TD></TR></TABLE>

Yup Yup.....thanks for the tip

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "GhostAccord" &raquo;</TD></TR><TR><TD CLASS="quote">it's because the cam is set for optimal hp and tq within a certain RPM range. </TD></TR></TABLE> = Power Band

Hey ya got any imaginary time slips for your imaginary 500hp RWD Accord you can post from last night or where you street racing for imaginary pinks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "philadd" &raquo;</TD></TR><TR><TD CLASS="quote">I feel like I've said this a hundred times -- This motor has a variable VTEC engagment point, which is anywhere between 2300 and 3800 rpms. </TD></TR></TABLE>
yeah what he said plus......all VTEC motors have variable VTEC engagements......that is what VTEC Variable valve Timing and Electronic lift Control is.....there is a good read on wikipedia all about VTEC, IVTEC and how they came to be.


Modified by GhostAccord at 7:11 AM 4/14/2007

 

has a metal grinding sound.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GhostAccord &raquo;</TD></TR><TR><TD CLASS="quote">...all VTEC motors have variable VTEC engagements......that is what VTEC Variable valve Timing and Electronic lift Control is.....there is a good read on wikipedia all about VTEC, IVTEC and how they came to be.</TD></TR></TABLE>

No, not all motors have variable engagement points. It's the valve timing and lift that is considered variable in all VTEC motors, not it's engagement points. DOHC motors such as H22s, F20Cs, F22Cs, etc. all have a set engagement point.

 

Vtec parameters


iVtec