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Old 05-16-2017, 08:00 PM   #1
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Default Intake piping volume calculator? Proper length and volume intake

I'm looking at making my own intake.

Hoping to not lose torque or horsepower anywhere, but maximize horsepower at 7000rpm

I've been trying to find calculators online for estimating volumes for best torque and horsepower gains. Only program I've found is called pipemax, but its a header design program. Any leads on this?

I plan on using a long silicone coupler in the front so I can easily slide a pipe back and forth to adjust length. Final intake will be welded aluminum, with a good cone filter and inner velocity stack. Might also have a chamber or two so I dont drop torque. This is mainly why I'd like some help with the calculations.

I'm not interested in wasting 240 dollars on a k&n intake that was probably not optimized for air density, 64mm throttle body, or flat top. or anything other than a generic product to make money.
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Old 05-16-2017, 08:50 PM   #2
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this has all been done before. search Emilio's posts. 21" I believe, U bend out of tb and back along side the IM
no need to waste any more time.
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Old 05-17-2017, 12:06 AM   #3
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huh, so not towards the exhaust side at all? I'll try to find the posts.

thanks bb
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Old 05-17-2017, 08:23 AM   #4
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Old 05-17-2017, 11:39 AM   #5
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^legend.

But doesn't every engine have different harmonics? With my N/A subaru we gained 17whp with a very specific length (also 5 hours on the dyno), and literally 1/2" on either side of that didn't make more than a cone filter on the throttle body.

Wouldn't I still have significant gains left on the table if I didn't tune the length myself?
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Old 05-17-2017, 12:10 PM   #6
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no
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Old 05-17-2017, 12:44 PM   #7
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Welp, now I'm back to wanting a calculator for intake volume.

The 21" (throttle body to diameter increase inside the filter) intake is a low volume intake, and will make me lose torque under4000rpm.

I'd like to have a box/chamber in my intake to boost torque under 4000, or keep it same as stock. There is ample room for a pretty large chamber, I just need to know what volume to add. I can't just fill up the oem resonator chamber with water and use that volume in my intake, that volume was used specifically with the entire oem intake, and isn't relevant to my 21" length 2.5od 3.75clr tube intake.

I also will need to fiddle with intake length, which is specific to every car. (I checked) NB2 optimum lengths are between 19-22 inches I'll have to allow adjustments for, and do virtual dyno runs to see the differences.
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Old 05-17-2017, 12:53 PM   #8
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lol ok have fun with that
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Old 05-17-2017, 01:43 PM   #9
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Quote:
Originally Posted by 18psi View Post
this has all been done before. search Emilio's posts. 21" I believe, U bend out of tb and back along side the IM
no need to waste any more time.
Emilio states no u-bend for best results. Not really sure why you're shitting on this thread when he's asking for something that hasn't been quantified publicly.
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Old 05-17-2017, 01:52 PM   #10
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Quote:
Originally Posted by albumleaf View Post
Emilio states no u-bend for best results. Not really sure why you're shitting on this thread when he's asking for something that hasn't been quantified publicly.
I'm not, at all. I think it's a waste of time unless you have the car strapped down on a really well calibrated dyno and conduct very time consuming and accurate a/b testing because at that point you're looking for 1-2hp/tq and VD will never be able to accurately display that much. We actually even tried this with his squaretop/skunk2 tb in the most controlled manner we could possibly think of and it was still really hard to see the gains. We also tested his VVT system and tried to get controlled testing for that.

Oh and he's a friend of mine, that I've helped with numerous things, so he knows I'm not hazing him.

So unwad the panties and take a hike.
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Old 05-17-2017, 02:01 PM   #11
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Alriiiiiight I'm out.

Last edited by albumleaf; 05-17-2017 at 02:19 PM.
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Old 05-17-2017, 05:44 PM   #12
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^lol yikes!

I have been annoying 949racing today, and have discovered that just moving the intake pick up point away (filter) from the exhaust side will negate the torque drop of not having the resonating chamber.

That's a good point about the vd not being accurate enough.


What I have found with 18psi's tough love, is.... at first I'm like, why is he not being helpful.... then i'm like... oh he's right. lol

I'll still post my discoveries and pictures of the intake in my build thread.
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Old 05-17-2017, 05:48 PM   #13
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Quote:
So his approach is pointless because the testing method is flawed? Ok
didn't say any of that, but even if I did, the answer would be yes.
if the measuring device can only be accurate up to about 5hp, and you're looking for that last 2hp, it's a waste of time.
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Originally Posted by thumpetto007 View Post


What I have found with 18psi's tough love, is.... at first I'm like, why is he not being helpful.... then i'm like... oh he's right. lol

I'll still post my discoveries and pictures of the intake in my build thread.
lol I hate because I love

But I know you're bored and have tons of time on your hands, so know yourself out
it will actually be pretty easy and cheap to do all this, and you'll probably learn a thing or two
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Old 05-17-2017, 06:17 PM   #14
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Old 05-17-2017, 08:14 PM   #15
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No, no the proper length is however long you need to make it to your intercooler and back up to your turbo......quit wasting time trying to make power N/A.
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Old 05-17-2017, 08:37 PM   #16
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^ that's in a few years. Unless you have a TSE 6258 kit plus 350hp intercooler kit, full exhaust and ID1000 injectors. I will also take mk turbo kit plus intercooler kit and ID1000. I have a 2001 Miata, with a/c.

The only thing keeping me sane is doing little projects on my car to waste time more productively.
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Old 05-17-2017, 08:42 PM   #17
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Or you could do a proven budget build with a 2560, cast manifold, eBay intercooler, MS2 and rx8 injectors for less than 2 grand (I spent less) and max out what your trans and motor can take.
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Old 05-17-2017, 10:09 PM   #18
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Quote:
Originally Posted by Bronson M View Post
Or you could do a proven budget build with a 2560, cast manifold, eBay intercooler, MS2 and rx8 injectors for less than 2 grand (I spent less) and max out what your trans and motor can take.
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Old 05-17-2017, 11:33 PM   #19
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I know there are budget builds out there, but I also need way more practice with the ms3 basic before I can safely tune with boost.

These little projects all help me learn something different about it, and I'm slowly accumulating good working knowledge.
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Old 05-18-2017, 06:31 AM   #20
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If you already have a MS3 you're on your way to being ready. While I was N/A I slapped a 90* silicone ell off the throttle body, just enough short section to get an AIT sensor in and put a cone filter on the end and honestly couldn't feel a difference over a stock setup. AIT's did drop considerably.
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