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Old 04-18-2009, 03:35 PM   #1
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Default Velocity Stack question

I have a K&N cai and so the air filter is still inside the engine compartment. Would it be better to use the velocity stack with the filter or with the air hose at the front of the bumper? I live in Socal so I don't have to worry about much rain or wetness.
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Old 04-18-2009, 07:55 PM   #2
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Default Re: Velocity Stack question

i honestly dont know if those velocity stacks even make a difference
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Old 04-18-2009, 07:56 PM   #3
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Default Re: Velocity Stack question

what's a velocity stack? a bumper inlet for the cai?
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Old 04-18-2009, 07:58 PM   #4
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Default Re: Velocity Stack question

Quote:
Originally Posted by vladd View Post
what's a velocity stack? a bumper inlet for the cai?
its a little conical thing that supposedly increases the velocity of the air entering the filter. check it out bro

http://passwordjdm.com/Blox-Racing-V...k-P2488C0.aspx
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Old 04-19-2009, 10:33 AM   #5
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Default Re: Velocity Stack question

I talked to a kid at the track on Friday who has a K swap in his '94 Civic sedan. He said his velocity stack added 6 hp on the dyno. I don't know if that's true but he's never BS'd me before.
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Old 04-19-2009, 10:46 AM   #6
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Default Re: Velocity Stack question

Velocity stacks are really only effective on race built motors, usually consisting of ITB's or most noticeably on carburetor cars and motorcycles with 1 carb per cylinder. On a motor like the K20 your better off just buying an aftermarket intake and saving yourself the money.
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Old 04-19-2009, 11:23 AM   #7
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Default Re: Velocity Stack question

if any of you understood how a velocity stack worked, you'd understand that it makes significantly more HP than a regular cotton/paper filter.

i run a Original Brian Peterson Innovation Velocity stack (Blox copied his design).
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Old 04-19-2009, 12:14 PM   #8
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Default Re: Velocity Stack question

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if any of you understood how a velocity stack worked, you'd understand that it makes significantly more HP than a regular cotton/paper filter.

i run a Original Brian Peterson Innovation Velocity stack (Blox copied his design).
Yes, if only we all knew as much as you do....

What does a velocity stack have to do with paper element filters? A velocity stack is not a filtering medium. Are you running a straight Velocity stack on your throttle body without a filter or something?

Velocity stacks on log manifold with runners is snake oil, they are designed for Throttle bodies and Carburetors to help high volume airflow characteristics at high RPM, and in Carbed applications also helps keep fuel going down the neck of the carburetor.

Instead of delving into an overbloated rant about physics, let us simply use logic at this moment.

If installing a $3 plastic cone into an intake system or on to a throttle body was enough to net the K20 engine nearly 6 more HP, why wouldn't Honda simply install them from the factory, being that in "Theory" <I.E Bullsh*t> a velocity stack does not effect emissions their is literally no reason for Honda not install this little "Miracle" item to the engine during its assembly.

Any "gains" seen from a velocity stack on a Civic can be attributed to either hacking up the pre-existing air box and piping to add new plumbing, adding an aftermarket air filter, or simply both, in the case of something like an Injen CAI.
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Old 04-19-2009, 12:55 PM   #9
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Default Re: Velocity Stack question

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Originally Posted by i-VTEC_DOHC View Post
its a little conical thing that supposedly increases the velocity of the air entering the filter. check it out bro

http://passwordjdm.com/Blox-Racing-V...k-P2488C0.aspx
where exactly would it go?
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Old 04-19-2009, 01:09 PM   #10
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Default Re: Velocity Stack question

http://en.wikipedia.org/wiki/Velocity_stack

Most of the information here seems correct. The Velocity Stack smooths the air flowing into the engine, which makes it easier to ignite. You attach it to your intake, then purchase a filter that fits on the outside of the large end of the Velocity Stack. I have seen the Velocity Stack work well. Of course it works best with a built engine and tuning.
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Old 04-19-2009, 09:12 PM   #11
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Default Re: Velocity Stack question

So, is it more advisable to use it with the air filter or the hose that goes to the front of the bumper?
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Old 04-19-2009, 09:33 PM   #12
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Default Re: Velocity Stack question

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Originally Posted by Kiwibird83 View Post
Velocity stacks are really only effective on race built motors, usually consisting of ITB's or most noticeably on carburetor cars and motorcycles with 1 carb per cylinder. On a motor like the K20 your better off just buying an aftermarket intake and saving yourself the money.
x2. i saw a drag honda at the last eibach and it had a long *** intake that went through the front headlight and had a velocity stack on it. no filter of course. here it is

Click the image to open in full size.
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Old 04-19-2009, 09:33 PM   #13
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Default Re: Velocity Stack question

Quote:
Originally Posted by vladd View Post
where exactly would it go?
look up at the pic i posted. thats where it goes.
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Old 04-19-2009, 11:33 PM   #14
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Default Re: Velocity Stack question

Ive seen a pic like that, but my set up is different. My K&N cai uses the air hose that goes to the front bumper. So there is filter and piping to the throttle body and an air collecting hose that comes from the bumper and connects into the air filter housing. So anyone know would it be better to use the stack at the filter or at the air hose at the front bumper.

Last edited by Gator0302; 04-19-2009 at 11:34 PM. Reason: wrong pic id
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Old 04-20-2009, 09:20 AM   #15
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Default Re: Velocity Stack question

The older K's or a K swapped car that ran off speed density will benefit from a velosity stack.. The z3 motor is a maf density design and will not benefit from the increased airflow nearly as much, you may get slightly lower air temps but the MAF sensor will still control the air/fuel to a factory setting , unless tuned for a velosity stack..

If just looking for cooler air temps , then relocate the battery and flip the intake to the front, where the bat is located.
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Old 04-20-2009, 10:18 AM   #16
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Default Re: Velocity Stack question

Quote:
Originally Posted by vladd View Post
where exactly would it go?
At the end of your tubular aftermarket Intake. They are good for about 5-10hp on most street engines depending on the length of the intake piping.

Here's a few pics of my custom ones installed

Click the image to open in full size.

Click the image to open in full size.

If anyone is interested in them I have a couple anodized bronze stacks left for $45 shipped including Paypal fees. They are compatible with K&N Filter part# RF-1048

Click the image to open in full size.
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Old 04-20-2009, 10:32 AM   #17
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Default Re: Velocity Stack question

imagine you suck up a bug or somethin
i dont want to run one in my area because its the desert and its obviously windy and dusty
BOOM!! haaaaaaa
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Old 04-20-2009, 10:36 AM   #18
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Default Re: Velocity Stack question

Quote:
Originally Posted by i-VTEC_DOHC View Post
imagine you suck up a bug or somethin
i dont want to run one in my area because its the desert and its obviously windy and dusty
BOOM!! haaaaaaa
Just put a filter over it
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Old 04-20-2009, 10:39 AM   #19
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Default Re: Velocity Stack question

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Just put a filter over it
hmm you obviously dont know how dusty it gets. it gets to the point where chp has to slow traffic to 25 mph on the freeway and guide people through.
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Old 04-20-2009, 10:53 AM   #20
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Default Re: Velocity Stack question

Quote:
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hmm you obviously dont know how dusty it gets. it gets to the point where chp has to slow traffic to 25 mph on the freeway and guide people through.
Should filter as good or better than your existing aftermarket airfilter.

This is what it looks like when installed on a V-Stack

Click the image to open in full size.
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Old 04-20-2009, 11:03 AM   #21
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Default Re: Velocity Stack question

hmm idk if i really want to put that on my injen. it states not to use any other filter. but im not interested in the v stack. all i did was post a pic up of one. and maf cars dont really benefit from a velocity stack as much as the speed density ones do
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Old 04-20-2009, 01:13 PM   #22
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Default Re: Velocity Stack question

Quote:
Originally Posted by miketat594 View Post
The older K's or a K swapped car that ran off speed density will benefit from a velosity stack.. The z3 motor is a maf density design and will not benefit from the increased airflow nearly as much, you may get slightly lower air temps but the MAF sensor will still control the air/fuel to a factory setting , unless tuned for a velosity stack..

If just looking for cooler air temps , then relocate the battery and flip the intake to the front, where the bat is located.
Spoken for truth. Your not going to see much benefit because of the MAF sensor. In the right applications, Velosity stacks work well. I ran a monster velosity stacks on my 65 Chevy Truck that ran a 427 rat motor (duel Holley 850 BP). I also run a velosity stack (open intake system) on my BMW, which gained me around 10whp.
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