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Can you keep Vtec with a Turbo???

 
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Old 09-26-2009, 07:55 PM
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Can you keep Vtec with a Turbo???

ok so I'm sure this question has bin asked a million times. but I know someone who says he's running a b20 vtec turbo. My point of logic tells me that there's no point of having vtec with forced induction because the point of vtec is to keep the valves open longer to allow more air in (I know there's more to it, I'm just summing it up).. So if a turbo is forcing air in, why would the valves need to be open longer? Wasn't vtec created for naturally aspirated engines? If I'm wrong here can someone please let me know, and explain the logic better? Cuz either I'm not getting it or he's not making any sense.
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Old 09-26-2009, 08:09 PM
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Re: Can you keep Vtec with a Turbo???

the way i look at it
vtec adds what 20-30 hp (maybe more maybe less) on a stock engine
build it and throw a turbo on it, why take away the extra power of vtec, it would add even more
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Old 09-26-2009, 08:14 PM
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Re: Can you keep Vtec with a Turbo???

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Originally Posted by andrei91 View Post
the way i look at it
vtec adds what 20-30 hp (maybe more maybe less) on a stock engine
build it and throw a turbo on it, why take away the extra power of vtec, it would add even more
But it doesn't just work like that. Because Vtec is just extending the valve overlap; and with turbo, you're just forcing air in faster so it would be just pushing a **** load of air in the intake valve and out the exhaust valve. so it wouldn't even be burning a bunch
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Old 09-26-2009, 11:53 PM
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Re: Can you keep Vtec with a Turbo???

the point of vtec is simple. keep a car economical in lower rpm's and have a great performance in upper rpm's all in one engine. youre just thinking too hard about this lol.
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Old 09-27-2009, 01:30 AM
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Re: Can you keep Vtec with a Turbo???

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Originally Posted by H22Driver View Post
But it doesn't just work like that. Because Vtec is just extending the valve overlap; and with turbo, you're just forcing air in faster so it would be just pushing a **** load of air in the intake valve and out the exhaust valve. so it wouldn't even be burning a bunch
The point of vtec would be to crame a f*** load of air into the intake. More air = the gas burner faster. Which then = more hp. haha im not great at math.
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Old 09-27-2009, 04:14 AM
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Re: Can you keep Vtec with a Turbo???

Wow, this thread has some of the worst mis-information I've ever seen on this board.

UPSluder is correct, VTEC has one purpose in life, and that is to deliver good drivability and torque at low RPM, while being able to deliver a bunch of power and smiles at the top of the rev range. In most cars you can choose only one, but with the variable timing systems around now we can have both.

Now in a perfect world, if you wanted to go turbo, you could get a cam ground so that you could have one cam profile for off boost/low boost driving, and one profile for when the turbo has spooled up and is making full boost. However this is a setup that I'm yet to actually hear about. Maybe it's one of those things that works well in principle but not in reality, much like the rotary engine.

Please, before you ask any more questions about turbocharging your car, read the stickies in the forced induction area of the forum.
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Old 09-27-2009, 07:12 AM
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Re: Can you keep Vtec with a Turbo???

VTEC + BOOST = AWESOME. Have you driven a boosted car w/ vtec???? it makes a huge difference in the power band. taking vtec out of the equation is stupid.... when boosting you usually start to spool at 3200 then full boost hits around 4000. my vtec cross over is lowered to 4800 to make a smoother power band but with out it i would have definitely not broke the 300hp mark. opening up the valves for longer duration is excellent for boost... you want the motor to take in more air under boost there is nothing but good things to come from vtec. yea i ve seen people take not use vtec in motors that are vtec for boost. usually that was because they couldn't tune or get the crossover right.
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Old 09-27-2009, 12:24 PM
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Re: Can you keep Vtec with a Turbo???

Getting rid of vtec is like getting rid of the cars penis and giving it a vagina.
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Old 09-27-2009, 01:36 PM
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Re: Can you keep Vtec with a Turbo???

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Getting rid of vtec is like getting rid of the cars penis and giving it a vagina.
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Old 09-27-2009, 01:48 PM
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Re: Can you keep Vtec with a Turbo???

yeah keep your vtec
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Old 09-27-2009, 02:22 PM
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Re: Can you keep Vtec with a Turbo???

what happenz is VTEC slows down time for everyone else making you go faster through time when adding turbo that like wow man
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Old 09-27-2009, 03:41 PM
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Re: Can you keep Vtec with a Turbo???

so if my vtec isn't working, i just need a new flux capacitor?
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Old 09-27-2009, 04:18 PM
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Re: Can you keep Vtec with a Turbo???

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Originally Posted by DrZoidberg View Post
so if my vtec isn't working, i just need a new flux capacitor?
that sounds about right to me
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Old 09-27-2009, 05:06 PM
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Re: Can you keep Vtec with a Turbo???

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Old 09-27-2009, 05:28 PM
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Re: Can you keep Vtec with a Turbo???

ok, imagine your friends engine not being b20 vtec... that would limit its rev range to like... 5500-6000? having the extra couple thousand rpms for a longer power band is vuuury nice...

but really... brash took the words out of my mouth... this thread almost made me
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Old 10-02-2009, 11:17 AM
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Re: Can you keep Vtec with a Turbo???

that is all
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Old 10-05-2009, 10:32 AM
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Re: Can you keep Vtec with a Turbo???

Because I know very little about turbos, and a pinch more about vtec, why not get a fast spool turbo that stops making boost at 5000 rpm? then get a better profile cam from crower? turbo doesn't compliment the vtec as nice as a supercharger does. Yeah i Know about the "you need hp to make hp argument," but for mild applications (and not letting out the h22 fairy) just bolt on a S/C that is DD dependable.
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Old 10-05-2009, 11:50 AM
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Re: Can you keep Vtec with a Turbo???

or if you have loads of money you could just invest in some ferrier roller rocker cams (vtec killers)
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Old 10-08-2009, 02:09 PM
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Re: Can you keep Vtec with a Turbo???

yea I don't have a lot of money lol. But o well, I think this thread needs to be closed. there was so many stupid replies to my question... it's embarassing
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Old 10-08-2009, 02:37 PM
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Re: Can you keep Vtec with a Turbo???

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