DarkBB4

Hey ive heard that vstacks help quite a bit.... would a setup similar to this see any gains? (other than transport water into the intake.... (rarely sees rain))


chops

madcatz

other than make your current whale ***** into a modified CAI....I dont think so....

the point of the velocity stack is to speed up the air...IIRC to the babble......Blake please chime in

WhiteBB2

iTrader: (1)

id say it would help some...i mean...all it would be doing is letting air in faster thru the hole...therefore giving the intake more air to suck in during WOT

I could be wroung and if I am then please explain.

MilanoLude

Are you planning on connecting the pipe under the hood or just letting it sit in front of the filter. You'll want to use a filter, especially if you're going to have the stack hanging out like that.

98vtec

other than looking a little rediculous.....

with that positioning there would be alot of bends in the intake which may cause some turbulence, but im not an engineer (yet). If you could get a straight pipe to come out and have access to a dyno, you could tune your intake length to make the best power.

Charliegrs

what lip is that is that the accord lip?

98vtec

please use the PM option for offtopic stuff.

thanks.

WhiteBB2

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MilanoLude &raquo;</TD></TR><TR><TD CLASS="quote">Are you planning on connecting the pipe under the hood or just letting it sit in front of the filter. You'll want to use a filter, especially if you're going to have the stack hanging out like that. </TD></TR></TABLE>

im assuming he would use the filter on the intake just like it is in the picture

mgags7

There are multiple advantages to the addition of a velocity stack to the intake pipe;

1) It allows smooth and even entry of air into the intake pipe, and causes the intake stream to adhere to the pipe walls

2) Function as a "reverse megaphone" which can extend the duration of intake pulses

3) Extending the intake pipe somewhat as to lower the "tuned" powerband due to the length of the intake pipe



Real world, they help to smooth out flow at all rpms, they iron out imperfections in the tune, as we saw on my brother's car on the dyno last week. Switching to my vstack setup from his pipe smoothed out the "vtec" dip in the midrange and gave a good 7ft-lb boost from about 4k to 6k....

lude98SH

Anyone have any dyno numbers ?

mgags7

blake took some....they pretty much correlate to the ones on the bpi site....they dont do a whole lot for the peak....check the midrange...

98vtec

yea....still waiting on getting complete info....if only the ******* would SEND ME MY GOD DAMN RUNS FILES

MilanoLude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WhiteBB2 &raquo;</TD></TR><TR><TD CLASS="quote">

im assuming he would use the filter on the intake just like it is in the picture</TD></TR></TABLE>

If this is the case, it's not going to be very productive. The velocity stack works great, but it wouldn't serve much of a purpose without it being directly connected to intake piping.

I mean....Air isn't really just gonna flow through it as you drive, especially not with the bends that will be needed to have the stack where it is chopped into place.

I have seen many cars run a similar setup at the drag strip with the headlight removed and the piping extended out of the engine bay with the stack on the end. Not practical for daily driving of course.

LudeBehavi0r

When he posted this I was assuming he intended to take off the Whale ***** and just run a straight pipe up to the IM.....

94Vtecluder

What you have there I don't think does much and just looks ricey since it's basically non-functional. I wouldn't figure that would affect the ambient air temp that much. Now if you fully attached it I would say it would be worthwhile.

M@

edit: I didn't see the whale ***** everyone was talking about till after I typed all this ****. so I assumed this was a CAI.


That appears to be the best case for pulling in air. The bends would make for some loss, but the ram air effect, and the coldest air possible would compensate for that.

As far as the hype its hype with support. The hype is part of how honda-tech sells parts. The support is the facts.

Losses in an intake are alot less then in a water pipe. In a water pipe most bend losses are about 0.1 of the velocity head(civil engineering term). Intake's are .4 of the velocity head.

Since the viscosity and density of air is much less then water the velocity head and losses in both cases are small.

I would guess most of the gains in the mid range is from the shorter intake. This changes the resonant frequency of the intake, and the smoothing of the flow in this intake(a function of the stack).

The combo of the stack, and the filter produce an increase in laminar flow at the entrance to the pipe its self.

I should stop typing now as I won't sober up till tomorrow.

Matt

LudeBehavi0r

Honestly i think some people havent seen all the guys with K20'ed eggs that have the ITB's sticking out of the front of the hood. LIke M@ said, it generates a ram air effect (aka a posstive preassure system thru the intake system, sorta like a turbo but on a smaller scale). So if you take all of this literally, yes having the v-stack exposed to open air on the front of the car is better, but you will loose some efficienty with increased numbers of bends in the pipe etc.

hamadiscool

This is interesting b/c I was thinking of doing a similar thing but putting the filter and the pipe coming from the outside in the stock air box. I would have just had the end of the pipe behind the bumper and not make it stick out like urs. But I think that if done right (with as less as bends as possible) then this set up could work. Goodluck dude and props for a having a hawt 4th gen

DCxMagus

Well wouldn't the pipes have to be connected for any effect to be ineffect here? It seems to me that yes you WOULD be gaining the advantages but then loose them since there really is no sucking effect thru the actually stack in that set up. It's just kind of hanging there as opposed to having it connect by pipping to the TB. Right now you just have a short ram intake on that lude. For it to take advantage of the velocity stack you would need to connect the piping from your short ram to your Velocity stack so that the Horn is actaully sucking in air. RIght now it's just like putting a hole in your bumper, your getting some more airflow sure but it's just a hole with tubing.

am I wrong here?

hamadiscool

I kinda agree with you. As it sits right now, its not doing anything at all. But if you confine the cold "ramed" air in to an air box and have the filter in the same box right in front of the other pipe then it will be a good thing. I have a velocity stack instead of a filter so i would get double the effect