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Running 3" Stack. Upgrade suggestion?

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Old Feb 21, 2013 | 01:36 PM
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Default Running 3" SRI with Velocity Stack. Upgrade suggestion?

Guys,
I have a EG Hatch with JDM Type-R swap. The motor is stock, just I/H/E.

It's tuned, and it made 198whp, running out of fuel around 7600-7800rpm.
I am in the process of upgrading fuel pump and injectors, and I'd like to let it breathe it a bit more before tuning again.
See signature for Dyno video.

I think it's time to upgrade my SRI to a larger diameter. I currently have a custom 3" pipe with BPi's 3" kit, and I would like to get either 3.5" or 4".

What would you guys recommend for my setup? 3.5" or 4"?

Thank you.

Last edited by DSMAddicted; Feb 21, 2013 at 02:42 PM.
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Old Feb 21, 2013 | 01:54 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

A large intake opening tapered down will be the best. I've seen some nice gains on cars going from a vstack with a opening of 3.5 and tapering down to a 3'' into the TB. I would assume it would be just as well to run a 4'' opening and taper it down to 3.5 and then possibly 3.. This is actual track testing that i've done on my own motor. alittle more in depth of a setup as yours, but it should follow the same suit.
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Old Feb 21, 2013 | 01:59 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

isnt that what the whale ***** is?

if i was to use a 4 inch v stack with that.

btw are there any dyno comparisons of intakes?im sure there are i just couldnt find any comparing the intake with v stack and many others.
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Old Feb 21, 2013 | 02:00 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Why not pick up an intake manifold+throttle body 68 or 70mm. I noticed nice gains with those two mods(then again I had the GSR IM) and go for the 3 inch intake and the 4.5 vstack.
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Old Feb 21, 2013 | 02:18 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

I forgot to mention, I plan on sending out the TB to get the MaxBore.com treatment.

Originally Posted by ALL M0T0R
A large intake opening tapered down will be the best. I've seen some nice gains on cars going from a vstack with a opening of 3.5 and tapering down to a 3'' into the TB. I would assume it would be just as well to run a 4'' opening and taper it down to 3.5 and then possibly 3.. This is actual track testing that i've done on my own motor. alittle more in depth of a setup as yours, but it should follow the same suit.
Thanks man. I wonder how could I accomplish this.
I am concerned that simply getting sections of aluminium tubing and welding them might create turbulence, due to the sharp reductions from 4" to 3.5" to 3".

Originally Posted by raverx3m
isnt that what the whale ***** is?
I doubt it, because the whale ***** gets smaller towards the tip (funny wording, but true from an intake perspective).

btw are there any dyno comparisons of intakes?im sure there are i just couldnt find any comparing the intake with v stack and many others.
When I did my research a year or so ago, didn't find any good comparisons, but general consensus was that Velocity Stack with SRI was the best performing intake.

Originally Posted by B_Swapped93
Why not pick up an intake manifold+throttle body 68 or 70mm. I noticed nice gains with those two mods(then again I had the GSR IM) and go for the 3 inch intake and the 4.5 vstack.
Indeed, I had forgotten to mention that I am planning on getting my TB bored out. It's 62mm stock, George from MaxBore said he can get it 65mm through with 70mm tapered opening.
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Old Feb 21, 2013 | 06:44 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

i went from a 3inch intake setup to the same length version in 4", i built both systems. the 4" on my motor worked the best as far as i can tell. i dont have track or dyno data but i have runs that i did that show a small gain in two areas in the powerband. losses i dont know...

never thought a unit that big would work but it even drives and tuned out better/smoother. just kept pulling. suprised me.
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Old Feb 21, 2013 | 09:48 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

how about intake length? is there arule of thumb for a 3 inch intake pipe.

its the most popular intake pipe size what is the most common lengths and how it affect powerband?

i tried some research but it seems more technical questions are harder to find. i ve been sucking at my search for answers lately more i get into details less answers i find on the internet.
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Old Feb 22, 2013 | 01:36 AM
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Default Re: Running 3" Stack. Upgrade suggestion?

Ill be following this thread. My intake length is tuned to my motor set up. It sticks out the headlight hole of my Crx almost to the forward most edge of the bumper. Moving it an inch or two in either direction greatly effected its performance.
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Old Feb 22, 2013 | 01:13 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Guys,
Yesterday, while posting this, I emailed Bryan over at BPI as well, and this is what he replied (posted with his permission):

I honestly would not recommend going larger. I was working with a local tuner once, and we tuned a customer with an aggressive all motor build that included a 2.0L block, with heads and cams. He was making in excess of 250whp. We found that his build was between the 3" and 3.5" intake systems. He gained more peak power with 3.5" intake and Flow Stack, but still yielded more "streetable" low and midrange power with the 3". I would not recommend making the jump to 3.5" unless you approach or cross that 250whp. You simply are not creating enough airflow to justify that larger intake system.

My recommendation is get your build complete. And tune the overall length on your intake. Make yourself a "dummy" intake, that sits outside the engine bay. Start really long. Make a dyno pull and cut off 2", make a pull and cut off 2". Continue until you find intake length with the most satisfying power curve. Then you can fabricate or cut your actual intake to length and you are ready to rock and roll.
Sounds like I'll be keeping my current setup and do some changes to SRI length, in addition to MaxBoring the TB. I plan on leaving my engine stock, mostly.

I hope the above information helps.
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Old Feb 22, 2013 | 04:27 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

can i use autozone flexpipe to find the right intake length?

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Old Feb 22, 2013 | 05:29 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Originally Posted by raverx3m
can i use autozone flexpipe to find the right intake length?
I wouldn't, as it will probably cause air turbulence due to the ridges and render your testing inaccurate, since the ridges are going to change as you extend or shorten it.
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Old Feb 22, 2013 | 05:38 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

cutting the intake by 2 inches every pass. is alot of dyno time for a small gain in my opinion.
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Old Feb 23, 2013 | 06:51 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Originally Posted by raverx3m
cutting the intake by 2 inches every pass. is alot of dyno time for a small gain in my opinion.
Once you have the car strapped on the dyno, it's not a big deal, especially if you're paying a tuner to tune your car. They normally do as many pulls as needed, it's not like your typical group dyno days where you pay $50 for three pulls, or something like that.

Besides, you're still gonna start with a relatively short intake tube, you just start from the longest you can tuck at the front corner of your bay and work your way towards the TB. It's not like you're cutting a 10 feet tube. In the end, it's perhaps 3-4 extra pulls. Worth it to me for a few horses.
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Old Feb 23, 2013 | 07:02 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

how can we tune our car ourself???
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Old Feb 23, 2013 | 07:54 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

are there any dyno compares from someone doing it?

man i wish there was more of those dyno posts but most of them are obsolete with pictures missing... and pretty much useless. but everyone keeps linking to them.

people used to be involved in this more.
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Old Feb 23, 2013 | 08:07 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

the saddest thing is
GDD section has 8528015 post
and the entire TECHNICAL section has only 5371397 posts

yes i just calculated out of curiosity

thats almost double the amount wtf.
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Old Feb 24, 2013 | 09:18 AM
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Default Re: Running 3" Stack. Upgrade suggestion?

I am running a CAI custom 3.5" > 3" with a 3.5" BPI Velocity stack.
Pic are near the bottom of this page below.
https://honda-tech.com/forums/showth...2808750&page=8
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Old Feb 24, 2013 | 09:40 AM
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Default Re: Running 3" Stack. Upgrade suggestion?

It really makes me wish I had welding skills. Does anyone sell a tapered intake?
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Old Feb 24, 2013 | 03:04 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Originally Posted by GagnarTheUnruly
It really makes me wish I had welding skills. Does anyone sell a tapered intake?
Like the one in my pictures? NOPE. Had to have it made that length, 9". You can find really short transistions 3" to 4" but that is to short.
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Old Feb 25, 2013 | 06:12 AM
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Default Re: Running 3" Stack. Upgrade suggestion?

Originally Posted by OH_1fstgsr
I am running a CAI custom 3.5" > 3" with a 3.5" BPI Velocity stack.
Pic are near the bottom of this page below.
Man, thanks for sharing, that is a very nice looking intake!

Originally Posted by GagnarTheUnruly
It really makes me wish I had welding skills. Does anyone sell a tapered intake?
Exactly how I feel.
Originally Posted by OH_1fstgsr
Like the one in my pictures? NOPE. Had to have it made that length, 9". You can find really short transistions 3" to 4" but that is to short.
I too looked for tapered metal tubes, but like OH_1fstgsr said I can only find short transitions.

How did your guy make the transitions so smooth? Did he manually taper part of the 3" and reduce the 3.5" a bit to make them match so well? Please let me know, I might try something similar.
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Old Mar 21, 2013 | 10:55 AM
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Default Re: Running 3" Stack. Upgrade suggestion?

can you heat up the pcv pipe and use the intake clamp to shrink it
or expand the smaller pipe to taper up to 3.5 or whatever size you need?
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Old Mar 21, 2013 | 12:02 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

These won't work?
http://www.burnsstainless.com/alumin...-2.aspx?page=3
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Old Mar 21, 2013 | 01:01 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Originally Posted by Khnemu
I studied these the long is still actually to short for ideal conditions.
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Old Mar 21, 2013 | 01:31 PM
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Default Re: Running 3" Stack. Upgrade suggestion?

Couldn't you ask Burns to make one at a 10 degree or smaller angle? I'm sure they could
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Old Mar 25, 2013 | 08:02 AM
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Default Re: Running 3" Stack. Upgrade suggestion?

Originally Posted by Khnemu
Couldn't you ask Burns to make one at a 10 degree or smaller angle? I'm sure they could
That would be sweet. Will have to look into it.
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