V-AFC
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Joined: Sep 2005
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V-AFC
As we know the V-AFC controls the Vtec on honda engines (Vtec engines) and you can control whenever you want the vtec to start kicking.
adjusting the vtec to kick @ 3500 Rpm is better than kicking @ 4500 or 5000 !
ok my question is: are you going to make your car faster if you let the vtec kick @ low rpm or you will make your car go slower?
Many people says you will make it slower !
In my opinion the 16 valves will work sooner and that doesnt have to do anything with making the car slower!
What do you guys think?
adjusting the vtec to kick @ 3500 Rpm is better than kicking @ 4500 or 5000 !
ok my question is: are you going to make your car faster if you let the vtec kick @ low rpm or you will make your car go slower?
Many people says you will make it slower !
In my opinion the 16 valves will work sooner and that doesnt have to do anything with making the car slower!
What do you guys think?
Honda-Tech Member
Joined: Mar 2003
Posts: 1,892
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From: OK
Re: V-AFC (gray_civic_coupe)
It may seem counterintuitive, but Honda put the VTEC crossover where they put it for a reason. Some may benefit from changing it lower, but not 2000 rpm lower. VTEC allows for more power at HIGHER RPM's, not just higher power anywhere in the powerband.
Will you make something up for me please?
Joined: Sep 2001
Posts: 6,365
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From: SoCal
Re: V-AFC (gray_civic_coupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gray_civic_coupe »</TD></TR><TR><TD CLASS="quote">In my opinion the 16 valves will work sooner and that doesnt have to do anything with making the car slower!</TD></TR></TABLE>
I applaud you guys for not flaming this guy to death.
To the original poster, you should use Google and find a link to read up on how exactly Vtec works. I'll try to find one for you as well.
All of the engine's valves are always working. What Vtec does, in essence, is enable a middle cam lobe to be used when a certain rpm is hit. Basically, at that rpm and above, the engine is using another higher profile cam lobe.
As others have said, Honda set it there for a reason. You will get the most power/reliability/gas mileage that way. It's set at a happy medium. Sure, you can make SOME adjustments (with proper tuning) to squeeze out a little more power at the expense of other things. However, adjusting it THAT much to where you were saying does absolutely nothing except slow the car down.
That's the simple explanation. Here's the more complicated one:
How Stuff Works: What does the VTEC system in a Honda engine do?
A little history and how it works
There are also a few types of Vtec for Hondas. Many other manufacturers use similar concepts, but have different names.
I applaud you guys for not flaming this guy to death.
To the original poster, you should use Google and find a link to read up on how exactly Vtec works. I'll try to find one for you as well.
All of the engine's valves are always working. What Vtec does, in essence, is enable a middle cam lobe to be used when a certain rpm is hit. Basically, at that rpm and above, the engine is using another higher profile cam lobe.
As others have said, Honda set it there for a reason. You will get the most power/reliability/gas mileage that way. It's set at a happy medium. Sure, you can make SOME adjustments (with proper tuning) to squeeze out a little more power at the expense of other things. However, adjusting it THAT much to where you were saying does absolutely nothing except slow the car down.
That's the simple explanation. Here's the more complicated one:
How Stuff Works: What does the VTEC system in a Honda engine do?
A little history and how it works
There are also a few types of Vtec for Hondas. Many other manufacturers use similar concepts, but have different names.
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Junior Member
Joined: May 2005
Posts: 264
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From: naperville, IL, USA
Re: V-AFC (gray_civic_coupe)
take this senerio. you hear a v8 w/ aggressive cams. It can barely keep the car alive at idle, and you watch them tap the gas to keep the rpms from going to low and killing the car (like if you let the clutch out too soon)
very aggressive cams are no good for a cars low end. Thats why vtec was created. to have the aggressive cams for the high end while keeping the low end economical and smooth.
Somthing like forced induction can use a lower vtec point to get more power sooner, but remember you will still have the same top out HP even if you engauge vtec sooner.
very aggressive cams are no good for a cars low end. Thats why vtec was created. to have the aggressive cams for the high end while keeping the low end economical and smooth.
Somthing like forced induction can use a lower vtec point to get more power sooner, but remember you will still have the same top out HP even if you engauge vtec sooner.
Will you make something up for me please?
Joined: Sep 2001
Posts: 6,365
Likes: 0
From: SoCal
Re: (gray_civic_coupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gray_civic_coupe »</TD></TR><TR><TD CLASS="quote">Thnx for your opinion guys 
</TD></TR></TABLE>
These are not opinions, they are fact. Go take your V-AFC and set it to where you think is good. Then see how much faster you will be.
</TD></TR></TABLE>These are not opinions, they are fact. Go take your V-AFC and set it to where you think is good. Then see how much faster you will be.
Honda-Tech Member
Joined: Jul 2005
Posts: 2,041
Likes: 1
Re: V-AFC (shamoo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shamoo »</TD></TR><TR><TD CLASS="quote">I applaud you guys for not flaming this guy to death.
To the original poster, you should use Google and find a link to read up on how exactly Vtec works. I'll try to find one for you as well.
All of the engine's valves are always working. What Vtec does, in essence, is enable a middle cam lobe to be used when a certain rpm is hit. Basically, at that rpm and above, the engine is using another higher profile cam lobe.
As others have said, Honda set it there for a reason. You will get the most power/reliability/gas mileage that way. It's set at a happy medium. Sure, you can make SOME adjustments (with proper tuning) to squeeze out a little more power at the expense of other things. However, adjusting it THAT much to where you were saying does absolutely nothing except slow the car down.
That's the simple explanation. Here's the more complicated one:
How Stuff Works: What does the VTEC system in a Honda engine do?
A little history and how it works
There are also a few types of Vtec for Hondas. Many other manufacturers use similar concepts, but have different names.
</TD></TR></TABLE>
Good info, I like that pic too... explains the different types well.
To the original poster, you should use Google and find a link to read up on how exactly Vtec works. I'll try to find one for you as well.
All of the engine's valves are always working. What Vtec does, in essence, is enable a middle cam lobe to be used when a certain rpm is hit. Basically, at that rpm and above, the engine is using another higher profile cam lobe.
As others have said, Honda set it there for a reason. You will get the most power/reliability/gas mileage that way. It's set at a happy medium. Sure, you can make SOME adjustments (with proper tuning) to squeeze out a little more power at the expense of other things. However, adjusting it THAT much to where you were saying does absolutely nothing except slow the car down.
That's the simple explanation. Here's the more complicated one:
How Stuff Works: What does the VTEC system in a Honda engine do?
A little history and how it works
There are also a few types of Vtec for Hondas. Many other manufacturers use similar concepts, but have different names.
</TD></TR></TABLE>Good info, I like that pic too... explains the different types well.
Thread Starter
Joined: Sep 2005
Posts: 130
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Re: (shamoo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shamoo »</TD></TR><TR><TD CLASS="quote">
These are not opinions, they are fact. Go take your V-AFC and set it to where you think is good. Then see how much faster you will be.</TD></TR></TABLE>
Sorry my bad, I meant thnx for the info
anyway i'm not going to buy the V-AFC because i wont need it so far
These are not opinions, they are fact. Go take your V-AFC and set it to where you think is good. Then see how much faster you will be.</TD></TR></TABLE>
Sorry my bad, I meant thnx for the info
anyway i'm not going to buy the V-AFC because i wont need it so far
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