Vtec on and off...
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Joined: Jul 2005
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From: PR, MI, USA
Vtec on and off...
I'm sorry if this sounds like a very stupid question, but i do not understand when someone talks about vtec coming on or off... What does this mean?
When does the vtec come on (specifically in a 97 honda prelude SH), and what does it actually do to the car differently than when the vtec is off?
If i am completly misunderstanding what people are saying just let me know.
Thanks a lot in advance.
When does the vtec come on (specifically in a 97 honda prelude SH), and what does it actually do to the car differently than when the vtec is off?
If i am completly misunderstanding what people are saying just let me know.
Thanks a lot in advance.
B*a*n*n*e*d
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From: Nowhere and Everywhere
Re: Vtec on and off... (jg86hawk)
I could be an ******* and tell you to search, but...
VTEC is a variable valve timing system. What it does is allow your motor to change between two sets of valve timing (high and low) to optimize fuel economy and performance. The lower cam has a powerband which ends well before redline, and then the high cam takes over and you get the benefit of the powerband from that cam. The vtec crossover (the name for vtec switching on/off) on a H22A1 is 5000rpm. The H22A4 (motor in a '94 prelude) should have a vtec crossover somewhere around there. When driving, you'll notice a change in exhaust note and a little kick right as it happens.
VTEC is a variable valve timing system. What it does is allow your motor to change between two sets of valve timing (high and low) to optimize fuel economy and performance. The lower cam has a powerband which ends well before redline, and then the high cam takes over and you get the benefit of the powerband from that cam. The vtec crossover (the name for vtec switching on/off) on a H22A1 is 5000rpm. The H22A4 (motor in a '94 prelude) should have a vtec crossover somewhere around there. When driving, you'll notice a change in exhaust note and a little kick right as it happens.
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From: NoR CaL, United States
Re: Vtec on and off... (The Phil)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Phil »</TD></TR><TR><TD CLASS="quote">I could be an ******* and tell you to search, but...
VTEC is a variable valve timing system. What it does is allow your motor to change between two sets of valve timing (high and low) to optimize fuel economy and performance. The lower cam has a powerband which ends well before redline, and then the high cam takes over and you get the benefit of the powerband from that cam. The vtec crossover (the name for vtec switching on/off) on a H22A1 is 5000rpm. The H22A4 (motor in a '94 prelude) should have a vtec crossover somewhere around there. When driving, you'll notice a change in exhaust note and a little kick right as it happens.</TD></TR></TABLE>
mine kicks in at 5250 stock... ( 99 base)
VTEC is a variable valve timing system. What it does is allow your motor to change between two sets of valve timing (high and low) to optimize fuel economy and performance. The lower cam has a powerband which ends well before redline, and then the high cam takes over and you get the benefit of the powerband from that cam. The vtec crossover (the name for vtec switching on/off) on a H22A1 is 5000rpm. The H22A4 (motor in a '94 prelude) should have a vtec crossover somewhere around there. When driving, you'll notice a change in exhaust note and a little kick right as it happens.</TD></TR></TABLE>
mine kicks in at 5250 stock... ( 99 base)
B*a*n*n*e*d
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From: Nowhere and Everywhere
Re: Vtec on and off... (AEMPrelude916)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AEMPrelude916 »</TD></TR><TR><TD CLASS="quote">
mine kicks in at 5250 stock... ( 99 base) </TD></TR></TABLE>
When do your butterflies open?
mine kicks in at 5250 stock... ( 99 base) </TD></TR></TABLE>
When do your butterflies open?
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From: NH
Re: Vtec on and off... (The Phil)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Phil »</TD></TR><TR><TD CLASS="quote">The H22A4 (motor in a '94 prelude) . .. .</TD></TR></TABLE>
Dont mean to nitpick, but shouldnt that be either h22a1 for the 94 or h22a4 for a 97+?
Not being a dick, just want to know if i am mistaken myself.
Added: the "butterflies" are in the intake manifold and change the path of the incomming air charge in order to save some torque down low and make hp at the higher revs. There is one butterfly for each cylinder. Picture them as smaller versions of the plate that is inside of the throttle body.
Dont mean to nitpick, but shouldnt that be either h22a1 for the 94 or h22a4 for a 97+?
Not being a dick, just want to know if i am mistaken myself.
Added: the "butterflies" are in the intake manifold and change the path of the incomming air charge in order to save some torque down low and make hp at the higher revs. There is one butterfly for each cylinder. Picture them as smaller versions of the plate that is inside of the throttle body.
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