v-tec

why do people take out the vtec system for high hp cars? nissan does the same with their vvti(vtec like) system.

Isn't it Toyota that has the VVT-i system and not Nissan?

nissan has a similar system, but back to the question

Maybe its so they can have lower compression ratios...i have no clue, i am just taking a guess. Anyone who actually knows what their talkin about wanna add in?

i think it has to do with the cam profile and lift but i don't know exactly what.

It is because they have cams that only have the vtec lobes on them and there is no reason for the smaller lobes so it runs on vtec all the time. This is done to shave weight off of the cams so that they can free up a little hp. The cams are called vtec killers.

also, vtec wasn't made for high hp, instead it was made for the economy

also, vtec was't made for high hp, instead it was made for the economy

Ok newbie stop posting crap that is not true. Please stop posting stuff like this because it makes you look dumb:screwy:

sorry but i'm trying to help right

there is an economy version VTEC...

VTEC-E is in some older civics and I believe it is for economy. It actually disabled one of the 2 intake valves, and I read Honda was able to get A/F ratios of 20:1. GSRs, Type Rs and SIs are purely power, and apparently(from what I've read) VTEC is Hondas answer to turbocharging because they felt turbos didn't get enough fuel mileage. VTEC changes the valves timing, but depending on how it does that will depend on the results.

The designed-for-power VTEC keeps the valves open more and longer letting in more air and fuel. You'll get noticeably less MPG if you hit VTEC a lot. Try it

sorry but i'm trying to help right

but youre trying to help when you dont know what your talking about, someone could have read that post, which you phrase it like you know what your talking about, and then go out and buy a LS and not a GSR cuz he thinks it will be faster.

also doesnt the newer civic HX's have vtec e, just not the 3 stage like that old civic did.(if you arent sure put it like a question like I do :biggrin: )

but youre trying to help when you dont know what your talking about, someone could have read that post, which you phrase it like you know what your talking about, and then go out and buy a LS and not a GSR cuz he thinks it will be faster.

also doesnt the newer civic HX's have vtec e, just not the 3 stage like that old civic did.(if you arent sure put it like a question like I do :biggrin: )

I think so(I never see it VTEC advertised with the HX). But Honda probably likes VTEC to be associated with power and wouldn't like somebody to think, "hey an HX has VTEC," then drive it, be dissapointed and talk smack. When the HX is under 2500, its only opening 1 valve and that valve is lifted higher and longer. At higher RPMS, both of the valves will take that higher and longer lift giving it a slight boost in power(if you buy a car solely for economy, you probably won't do this anyway). So I guess even the economy VTEC is better than no VTEC... naturally aspirated of course... :uhoh:

Quote:
The designed-for-power VTEC keeps the valves open more and longer letting in more air and fuel. You'll get noticeably less MPG if you hit VTEC a lot. Try it

No Shit Sherlock! You at a higher RPM (like 6k right?) so even if you don't have a VTEC head you'll be getting way less mileage. LOL.

I don't think you can say "when you Hit VTEC" or "when VTEC kicks in" since variable valve timing isn't something that just "kicks in". Changing cam profiles doesn't mean you've hit VTEC or that you're now running on it, it just means the engine has multiple cam profiles and can vary between them, so they named it VTEC. It isn't some special point you reach or a button you push, it's just an engine design.
(None of this is to attack anyone BTW)

There's an article on Honda's VTEC in the engineering/technical forum:
http://www.automotiveforums.com/vbulletin/showthread.php?t=77265

It is because they have cams that only have the vtec lobes on them and there is no reason for the smaller lobes so it runs on vtec all the time. This is done to shave weight off of the cams so that they can free up a little hp. The cams are called vtec killers.

listen to whtteg an lancaster. for the overall effect, etc, they have stated the truth.

the others who spoke about VTEC-E, etc...were also on the button.

feel free to ask questions ppl, but once u start posting comments, then ppl start to believe it, an THAT is when the "stereotypical honda driver" is born.

Quote:
[B]

There's an article on Honda's VTEC in the engineering/technical forum:
http://www.automotiveforums.com/vbulletin/showthread.php?t=77265



Please read and understand this before any one makes another reply in this thread.


LancasterWannaBe thank you for posting it, it's nice to know at least one person around here knows what they are talking about :smokin:





VTEC is most often removed from a race engine for the very simple reason that it simplfies things, which then makes the engine much easier to tune, and in theory much more reliable.
The first part makes sense, as you are left with only one fuel curve to worry about instead of the two required for efficant running, but there is lots of debate about the latter. The valve gear only ever runs at half the speed of the bottom end and is signifcantly lighter and so under goes far less stress. If Honda can build a crank than can turn at over 10,000rpm and produce well over 300hp from the factory then they can certianly build a valve train than can take similar or greater abuse. By replacing it with aftermarket parts (which is required if useing a non-VTEC cam) then your introducing parts that due to limited production quantities and R&D work may infact be weaker and not suited to working as part of the complete system that an engine must become.

Quote:
The designed-for-power VTEC keeps the valves open more and longer letting in more air and fuel. You'll get noticeably less MPG if you hit VTEC a lot. Try it

No Shit Sherlock! You at a higher RPM (like 6k right?) so even if you don't have a VTEC head you'll be getting way less mileage. LOL.

I don't think you can say "when you Hit VTEC" or "when VTEC kicks in" since variable valve timing isn't something that just "kicks in". Changing cam profiles doesn't mean you've hit VTEC or that you're now running on it, it just means the engine has multiple cam profiles and can vary between them, so they named it VTEC. It isn't some special point you reach or a button you push, it's just an engine design.
(None of this is to attack anyone BTW)

There's an article on Honda's VTEC in the engineering/technical forum:
http://www.automotiveforums.com/vbulletin/showthread.php?t=77265

Good One :screwy: . I said that because he said it was for economy reasons, so VTEC will USE MORE, because VTEC KICKS IN. Read the whole post next time, otherwise you probably will end up attacking smoeone, even if you claim not to.
I can say that, and I did, despite your attempts to make those statements not make sense or get the job done of trying to demonstrate a point, they still do. Thats basically how its referred to, unless you want me to to a dragged out version everytime.
And actually some people would consider it a special point

, because VTEC KICKS IN.


VTEC does not kick in.
There is a noticable change when the cam pin between the rockers is slid accross and the 2nd set of lobes come into effect, but in reality VTEC is "active" all the time.

The term "the VTEC kicked in" has no tecnical basis, and is merely used as a way of inacuratly describing the change in cam lobes.
Its not however wrong to use it, as like other meaningless sayings it has become and understandable part of our culture, Iv used the phrase many times myself.


So no arguing over simple linguistics.