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> Honda, how doese vtech work
97eclipsegstspyd...
post Oct 11 2006, 09:25 AM
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i was wondering how does a vtech work? my freind keeps talking about his honda and vtech but he doesent even know how it works :laughing:
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mfalik
post Oct 11 2006, 09:48 AM
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read this posting, it should clear things up.

http://www.mitsubishi-forums.com/t14077-mivec-vs-vtec.htm

Synopsis:

Vtec (Honda/Acura), Mivec (Mitsubishi), Ecotech (GM), VVTi (Toyota) are all the same thing.

They basically have two different cam profiles (one for the low RPM range, and the other for the high RPM range).

Long story short:

None of the above create horsepower, they simply create a more ideal cam profile for the two rpm ranges.
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97eclipsegstspyd...
post Oct 11 2006, 10:03 AM
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:liebe011:
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EMC 3000gt
post Oct 21 2006, 12:44 AM
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Ok I just read that forum and it doesn't answer your question.

Vtec works like this you step on the throttle you go through the low rpms in search for your 2 goals Vtec and redline. As your rpm's climb so does your oil pressure. vtec cars have a vtec computer that in short reads oil pressure when it hits a certain pressure the computer is like OMG SWITCH!!! and somthing does somthing a solinoid here and there and all of a sudden the cam angle is adjusted to a more agressive angle giving you a boost in performance... and horrbible fuel economy.

The idea was to give cars great MPG and a normal idle and high performance at high RPM's... the integra gsr is a 1.8L motor and makes 170 hp and 130 LB/FT Torque at i think 7000 rpms... redline is 8000

the type r make 190-200 and revs to 8500ish

SO in the end vtec is a great idea for the everyday driver who needs the car to get great mpg and on occasion has a heavy foot.

the new iVtec system works similar however it is more complex because it will also engage at WOT. Enjoy hope this helps... I'm 99% sure that is all correct... also aftermarket Vtec controllers do not work as well as the make them sound. not worth buying for the normal car.actually not worth it all if your that serious about performance then change the cams all together... Trust me your friend will eventually start talking about them.

Ciao
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utiheadbanger
post Oct 23 2006, 07:41 PM
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QUOTE(EMC 3000gt @ Oct 21 2006, 12:44 AM)
Ok I just read that forum and it doesn't answer your question.

Vtec works like this you step on the throttle you go through the low rpms in search for your 2 goals Vtec and redline. As your rpm's climb so does your oil pressure. vtec cars have a vtec computer that in short reads oil pressure when it hits a certain pressure the computer is like OMG SWITCH!!! and somthing does somthing a solinoid here and there and all of a sudden the cam angle is adjusted to a more agressive angle giving you a boost in performance... and horrbible fuel economy.

The idea was to give cars great MPG and a normal idle and high performance at high RPM's... the integra gsr is a 1.8L motor and makes 170 hp and 130 LB/FT Torque at i think 7000 rpms... redline is 8000

the type r make 190-200 and revs to 8500ish

SO in the end vtec is a great idea for the everyday driver who needs the car to get great mpg and on occasion has a heavy foot.

the new iVtec system works similar however it is more complex because it will also engage at WOT. Enjoy hope this helps... I'm 99% sure that is all correct... also aftermarket Vtec controllers do not work as well as the make them sound. not worth buying for the normal car.actually not worth it all if your that serious about performance then change the cams all together... Trust me your friend will eventually start talking about them.

Ciao
[right][snapback]72694[/snapback][/right]


You are KINDA right...

VTEC, on older Hondas, can be either SOHC or DOHC depending on engine code. SOHC engines have 4 valves per cylinder, as the DOHC does, but there is a locking mechanism between the two valves on the intake side only. When the oil pressure solenoid senses a certain oil pressure, on the SOHC it locks the two intake valves together, advances ignition timing slightly, and that is why you hear a rapid tapping under the valve cover. The DOHC works similar, but has VTEC on both the intake and exhaust valves.

iVTEC is computer controlled AND pressure controlled. The computer changes ignition timing based on engine load.
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TTAngel
post Oct 27 2006, 09:39 AM
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V-T3C Pwn5 411.

I saw a civic hatchback out launch an f-15 fighter on an aircraft carrier one time. It was mad tight.

Also, don't forget that alot of turbo'd hondas will ditch the v-tec because it starts to get hard to tune around.

Also, with a turbo set up a mild cam will go a lot further.
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utiheadbanger
post Nov 2 2006, 11:35 PM
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QUOTE(TTAngel @ Oct 27 2006, 09:39 AM)
V-T3C Pwn5 411.

I saw a civic hatchback out launch an f-15 fighter on an aircraft carrier one time.  It was mad tight.

Also, don't forget that alot of turbo'd hondas will ditch the v-tec because it starts to get hard to tune around.

Also, with a turbo set up a mild cam will go a lot further.
[right][snapback]73808[/snapback][/right]


You are right...BUT...a lot of the non-computer-controlled VTECs don't have an issue since it's timed on oil pressure.
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4G63Attack
post Nov 3 2006, 03:38 AM
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QUOTE(97eclipsegstspyder3 @ Oct 11 2006, 06:25 AM)
i was wondering how does a vtech work? my freind keeps talking about his honda and vtech but he doesent even know how it works :laughing:
[right][snapback]70805[/snapback][/right]


we'll taking about phone right V-Tech. You guys got it all wrong about V-Tec it is not about valve time or when your are at WOT it is Very Tall Engine Cooling :laughing:
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TTAngel
post Nov 3 2006, 09:15 AM
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QUOTE(4G63Attack @ Nov 3 2006, 03:38 AM)
we'll taking about phone right V-Tech. You guys got it all wrong about V-Tec it is not about valve time or when your are at WOT it is Very Tall Engine Cooling :laughing:
[right][snapback]74978[/snapback][/right]


:grin: It's a lite on your dash that tells you when the blinker fluid needs to be changed. :laughing:
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PapaWood
post Nov 8 2006, 11:50 AM
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If i had a vtac Id get a light installed so i know when it working, and they look cool. I want to cut a hood in my hood and turn my shortram upside down. ******* Vtac...
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Yeorwned
post Sep 15 2007, 10:55 AM
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EclipsedGT
post Sep 15 2007, 01:34 PM
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my vtec kicks in at 5400 and i tell you what, you can tell... sounds like someone lit the fire on an afterburner when it hits and man does it start pulling
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EMC 3000gt
post Sep 15 2007, 01:39 PM
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I love the vtec in the S2000's never been in the NSX but i can only imagine. theres a guy near me with a supercharged NSX, the thing is sick.
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4G63Attack
post Sep 15 2007, 01:49 PM
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the Nsx Vtec is great when you go WOT.
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EMC 3000gt
post Sep 15 2007, 03:13 PM
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Yeah well, thats the point. And when was the last time you went past 5000 RPMs not at WOT. ;)
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4G63Attack
post Sep 15 2007, 03:47 PM
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well! my friends NSX is the Type S only 51 in the U.S.A
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fullmoon
post Sep 24 2007, 05:45 PM
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Here's a Honda without V-Tec!!! You wanna see sick this is sick as it gets!!! :)

http://www.thetorquereport.com/2007/06/cor...a_civic_ex.html
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downshift
post Sep 27 2007, 07:15 PM
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civette
^
thats the build up thread.
pretty wild

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silvreclipse
post Sep 27 2007, 08:26 PM
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where the pics for this thing.
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downshift
post Sep 28 2007, 12:09 PM
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:laughing:
click on the word " civette "
either here or the other post.
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