Crossing into VTEC
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From: usa
Crossing into VTEC
Do any of you hear a noticeable sound difference when you cross the RPM-line into vtec? I was watching a video of a guy on youtube revving into vtec in 3rd gear so it would go slowly. Right when he hits it, you can hear a very loud audible, deeper noise start coming up. I tried this on my civic, I cant hear even the tiniest difference. Even more, my car doesnt really feel like it pulls any harder before vtec or after.
I also should mention my car isnt an SI. Are your cars all like this as well (base model or Si?). It excited me buying my first honda car, but now that my car feels no different at 2k rpms or 6k, It has lost its appeal.
I also should mention my car isnt an SI. Are your cars all like this as well (base model or Si?). It excited me buying my first honda car, but now that my car feels no different at 2k rpms or 6k, It has lost its appeal.
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Joined: Jan 2002
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From: AZ
Re: Crossing into VTEC (elohel)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by elohel »</TD></TR><TR><TD CLASS="quote"> I cant hear even the tiniest difference. Even more, my car doesnt really feel like it pulls any harder before vtec or after.
</TD></TR></TABLE>
lol WIERD!@
its a super-econobox man... your VteaHCK is there for improved fuel economy, not to give mad gains in acceleration.
k20 DOHCVTEC is completley different
</TD></TR></TABLE>
lol WIERD!@
its a super-econobox man... your VteaHCK is there for improved fuel economy, not to give mad gains in acceleration.
k20 DOHCVTEC is completley different
Junior Member
Joined: Feb 2006
Posts: 353
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From: Birmingham, Alabama, USA
Re: Crossing into VTEC (elohel)
The Si is DOHC iVTEC. therefore the VTEC will pull harder.
on the non si models, I believe they are SOHC (single overhead cam)
its like me comparing my 2000 civic ex (D16Y8) to the 2000 civic Si (B16A2) A good example of SOHC vs. DOHC
They both have VTEC, but one has DOHC and one has SOHC. I remember trying to find vtec in my 00 ex. i finally found it one day on the hughway with a buddy of mine. it happend when you pressed the gas harder at like 80 mph. hard enough for it not to downshift, but hard enough to feel the extra power. it was sweet.
haha
but anyway
I believe thats right. someone correct me if im wrong.
on the non si models, I believe they are SOHC (single overhead cam)
its like me comparing my 2000 civic ex (D16Y8) to the 2000 civic Si (B16A2) A good example of SOHC vs. DOHC
They both have VTEC, but one has DOHC and one has SOHC. I remember trying to find vtec in my 00 ex. i finally found it one day on the hughway with a buddy of mine. it happend when you pressed the gas harder at like 80 mph. hard enough for it not to downshift, but hard enough to feel the extra power. it was sweet.
haha
but anyway
I believe thats right. someone correct me if im wrong.
Junior Member
Joined: Feb 2006
Posts: 113
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From: westminster, ca, usa
Re: Crossing into VTEC (TRAG)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TRAG »</TD></TR><TR><TD CLASS="quote">The Si is DOHC iVTEC. therefore the VTEC will pull harder.
on the non si models, I believe they are SOHC (single overhead cam)
its like me comparing my 2000 civic ex (D16Y8) to the 2000 civic Si (B16A2) A good example of SOHC vs. DOHC
They both have VTEC, but one has DOHC and one has SOHC. I remember trying to find vtec in my 00 ex. i finally found it one day on the hughway with a buddy of mine. it happend when you pressed the gas harder at like 80 mph. hard enough for it not to downshift, but hard enough to feel the extra power. it was sweet.
haha
but anyway
I believe thats right. someone correct me if im wrong.</TD></TR></TABLE>
your wrong. for example both the base rsx and type-s are dohc vtec. the base has the econo vtec which only switch the exhaust side i think or the intake side i forgot. but the type-s switches both exhaust and intake to make more power. i guess a quick way to check is see if your tach redline around 6k if it does then you prolly don't have it.
on the non si models, I believe they are SOHC (single overhead cam)
its like me comparing my 2000 civic ex (D16Y8) to the 2000 civic Si (B16A2) A good example of SOHC vs. DOHC
They both have VTEC, but one has DOHC and one has SOHC. I remember trying to find vtec in my 00 ex. i finally found it one day on the hughway with a buddy of mine. it happend when you pressed the gas harder at like 80 mph. hard enough for it not to downshift, but hard enough to feel the extra power. it was sweet.
haha
but anyway
I believe thats right. someone correct me if im wrong.</TD></TR></TABLE>
your wrong. for example both the base rsx and type-s are dohc vtec. the base has the econo vtec which only switch the exhaust side i think or the intake side i forgot. but the type-s switches both exhaust and intake to make more power. i guess a quick way to check is see if your tach redline around 6k if it does then you prolly don't have it.
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From: USA
Re: Crossing into VTEC (nMotion96)
A better explaination, the fuel econo VTEC dub SOHC VTEC-E, SOHC iVTEC, DOHC iVTEC (misleading should have been dub DOHC iVTEC-E) which has 2 lobes per cylinder on the intake side while there is only 1 on the exhaust side (not sure how the profile on the SOHC are, but operates in the same manner).
When it is at low rpms (~0-2500rpm) it will be running on the fuel econo lobe profile which open only one intake valve and causes the intake charge to swirl in the cylinder resulting in a better fuel/air mixture, but yet creating a lean mixture. Due to the lean mixture about 16:1 the engine will consume less gas, therefore, the vehicle gets more mpg.
At about 2500rpm the rocker arms on the intake side will lock as one unit (VTEC) via a piston/pin causing the other intake cam profile (the "high speed/lift" profile -which is about the same as the primaries that are on the 3 lobed vtec cams) to make contact operating the second intake valve increasing the engine's power, but in reality all it did was made the engine run like any other ordinary 4 valves per cylinder engine operating 2 valves at a time in the 720 cycle.
Translation for VTEC-E impaired: you have VTEC...the one that saves you gas, but not the one that makes your engine change from dr. jeckle to mr. hyde.
On to the fun stuff, the hi performance oriented SOHC VTEC, DOHC VTEC, and DOHC iVTEC. The only thing differ from the SOHC and the DOHC VTEC is that VTEC operates only on the intake side not both intake and exhuast like the DOHC configuration.
Now that is stated, on the DOHC configuration both cams have 3 profiles per cylinder, the middle profile being the high duration and lift. High duration and lift will cause the valve to open wider and stay open longer this will cause the engine to have a higher redline as well -the simplest way to tell if you have the hi performance VTEC engine.
There is a reason to how come a engine needs to rev high and low, but will not be discussed for this topic. For now, a higher redline will let the cams make its full power potenial.
These VTEC motor operates similary to the econo versions just that VTEC comes on at a different point usually about 4500-6600rpm (type of engine differs). When the rpm reaches the VTEC point (this is when you feel the VTEC kick in), the middle rocker arm will lock as one unit and since the middle cam profile is larger and wider the rocker arm will make contact with it. Therefore, both the intake and exhaust valves will open wider and longer than normal 4 valves per cylinder engines would.
By doing so, more air and fuel is introduced into the cylinder and allowing more exhaust to expel out so the air mixture will be more cool resulting in more power being produced. Due to the valves opening wider and longer the engine will be louder which is music to us "VTAK" lovers. This sound is described by some "as if the engine is going to pop out and run ahead of the car." Simple translation, you've got cheap turbo! - that is what my buddies like to say.
I know you guys are going to say what is the "i" for, well that is easy, its dub as "intelligence" or the real deal "VTC" aka Varible Timing Control. This is a timing sprocket that is equiped on the intake side of the cam that continuously variates the degree of the intake camshaft. The degree varies among engines from 25-50 degrees. VTC aid in more power being produced because it reduces pumping loss of the engine...Hmm, not so sure on that, but probably got info mixed up with AVTEC.
I know this read is overkill, but I am bored and wanted to write something.
When it is at low rpms (~0-2500rpm) it will be running on the fuel econo lobe profile which open only one intake valve and causes the intake charge to swirl in the cylinder resulting in a better fuel/air mixture, but yet creating a lean mixture. Due to the lean mixture about 16:1 the engine will consume less gas, therefore, the vehicle gets more mpg.
At about 2500rpm the rocker arms on the intake side will lock as one unit (VTEC) via a piston/pin causing the other intake cam profile (the "high speed/lift" profile -which is about the same as the primaries that are on the 3 lobed vtec cams) to make contact operating the second intake valve increasing the engine's power, but in reality all it did was made the engine run like any other ordinary 4 valves per cylinder engine operating 2 valves at a time in the 720 cycle.
Translation for VTEC-E impaired: you have VTEC...the one that saves you gas, but not the one that makes your engine change from dr. jeckle to mr. hyde.
On to the fun stuff, the hi performance oriented SOHC VTEC, DOHC VTEC, and DOHC iVTEC. The only thing differ from the SOHC and the DOHC VTEC is that VTEC operates only on the intake side not both intake and exhuast like the DOHC configuration.
Now that is stated, on the DOHC configuration both cams have 3 profiles per cylinder, the middle profile being the high duration and lift. High duration and lift will cause the valve to open wider and stay open longer this will cause the engine to have a higher redline as well -the simplest way to tell if you have the hi performance VTEC engine.
There is a reason to how come a engine needs to rev high and low, but will not be discussed for this topic. For now, a higher redline will let the cams make its full power potenial.
These VTEC motor operates similary to the econo versions just that VTEC comes on at a different point usually about 4500-6600rpm (type of engine differs). When the rpm reaches the VTEC point (this is when you feel the VTEC kick in), the middle rocker arm will lock as one unit and since the middle cam profile is larger and wider the rocker arm will make contact with it. Therefore, both the intake and exhaust valves will open wider and longer than normal 4 valves per cylinder engines would.
By doing so, more air and fuel is introduced into the cylinder and allowing more exhaust to expel out so the air mixture will be more cool resulting in more power being produced. Due to the valves opening wider and longer the engine will be louder which is music to us "VTAK" lovers. This sound is described by some "as if the engine is going to pop out and run ahead of the car." Simple translation, you've got cheap turbo! - that is what my buddies like to say.
I know you guys are going to say what is the "i" for, well that is easy, its dub as "intelligence" or the real deal "VTC" aka Varible Timing Control. This is a timing sprocket that is equiped on the intake side of the cam that continuously variates the degree of the intake camshaft. The degree varies among engines from 25-50 degrees. VTC aid in more power being produced because it reduces pumping loss of the engine...Hmm, not so sure on that, but probably got info mixed up with AVTEC.
I know this read is overkill, but I am bored and wanted to write something.
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Junior Member
Joined: Nov 2006
Posts: 439
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From: Harrisburg, PA, US
Re: (ahhhitsjames)
some EX 06 coupe wizz'ed by me while i was parking. and he topped out 1st and second gear. it sounds bad compared to the si. DoHC> SoHC ! but alot of cars are getting stock DOHC's now a days. blah! copiers
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From: Irvine, Ca, USA
Re: (modifyORdie)
Wrong ... an EX with an intake and/or exhaust sounds very nice.. similar to a k20.. but not exactly .. it roars and you can very much notice VTEC engagement..
Modified by ahhhitsjames at 5:53 AM 12/1/2006
Modified by ahhhitsjames at 5:53 AM 12/1/2006
Joined: Nov 2004
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From: post whore pro
Re: (ahhhitsjames)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ahhhitsjames »</TD></TR><TR><TD CLASS="quote">Wrong ... an EX with an intake and/or exhaust sounds very nice.. similar to a k20.. but not exactly .. it roars and you can very much notice VTEC engagement..
Modified by ahhhitsjames at 5:53 AM 12/1/2006</TD></TR></TABLE>
try a turbocharged ex...no sound or noticement at all
Modified by ahhhitsjames at 5:53 AM 12/1/2006</TD></TR></TABLE>
try a turbocharged ex...no sound or noticement at all
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Joined: Jan 2002
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From: AZ
Re: (ahhhitsjames)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ahhhitsjames »</TD></TR><TR><TD CLASS="quote">Wrong ... an EX with an intake and/or exhaust sounds very nice.. similar to a k20.. but not exactly .. it roars and you can very much notice VTEC engagement..
</TD></TR></TABLE>
Sorry but I strongly disagree... With an I/E you may hear a SLIGHT changeover but its not similar to the K20 crossover in ANY way.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by modifyORdie »</TD></TR><TR><TD CLASS="quote">
noticement </TD></TR></TABLE>
Is that a word?
</TD></TR></TABLE>
Sorry but I strongly disagree... With an I/E you may hear a SLIGHT changeover but its not similar to the K20 crossover in ANY way.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by modifyORdie »</TD></TR><TR><TD CLASS="quote">
noticement </TD></TR></TABLE>
Is that a word?
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Joined: Oct 2002
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From: New Jersey
Re: (TRE_)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TRE_ »</TD></TR><TR><TD CLASS="quote">
Is that a word?
</TD></TR></TABLE>
http://dictionary.reference.com/browse/noticement
no
Is that a word?
</TD></TR></TABLE>
http://dictionary.reference.com/browse/noticement
no
Joined: Nov 2004
Posts: 2,785
Likes: 0
From: post whore pro
Re: (TRE_)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TRE_ »</TD></TR><TR><TD CLASS="quote">
Is that a word? </TD></TR></TABLE>
yes. it's in the 2006 edition of Amber's dictionary. as is placege, spiffly, supty, and craptacular
Is that a word?
</TD></TR></TABLE>yes. it's in the 2006 edition of Amber's dictionary. as is placege, spiffly, supty, and craptacular
Joined: Nov 2004
Posts: 2,785
Likes: 0
From: post whore pro
Re: (TRE_)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TRE_ »</TD></TR><TR><TD CLASS="quote">
Sorry but I strongly disagree... With an I/E you may hear a SLIGHT changeover but its not similar to the K20 crossover in ANY way. </TD></TR></TABLE>
THANK you....now all the old-school SOHC people can flame you instead of me
Sorry but I strongly disagree... With an I/E you may hear a SLIGHT changeover but its not similar to the K20 crossover in ANY way. </TD></TR></TABLE>
THANK you....now all the old-school SOHC people can flame you instead of me
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