DIY 4" intake

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Old Mar 15, 2013 | 09:59 PM
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DIY 4" intake

Due to all the hype on 4" intakes on the J30 7th gen accords(TL's little brother), I will be putting one on my TL-S. Not sure how many other TL-S are running this setup, but a quick search showed its mostly accords. Obviously this is for people who are interested in function over form as this WILL outperform the very popular AEM V2 cold air intake. I ordered a 4" 90 degree aluminum pipe, 3"-4" coupler, 4" clamps, and a 4" K&N filter. Parts should be here in a couple days and I'll post some pics and a small DIY if you guys are interested. Here is a pic from an accord over at v6.p forum to give an example:
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Old Mar 15, 2013 | 10:18 PM
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Old Mar 15, 2013 | 10:32 PM
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Saw your post over on v-six-p that you ordered the parts. I was going to PM you but now I don't have to. I would assume what's working for them will work for us since the Accord AEM V2 fits the TL. I need to hurry up and order a Braille soon too; I want lots of room.
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Old Mar 16, 2013 | 04:11 PM
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im still new around here, but unless you have a ton of mods and bolt ons, how much more can you really gain over the avalible CAI we have. i get the whole "more air = more power" but is there proof? just askin
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Old Mar 16, 2013 | 08:52 PM
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This is really more suited for those who have done the 3.7 SHAWD manifold and TB swap. There are dyno proven gains on VsixP and on here by Sonnick. I wouldn't bother if you're still on the stock manifold/ TB, unless it's all ported.
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Old Mar 16, 2013 | 10:22 PM
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Originally Posted by anx1300c
This is really more suited for those who have done the 3.7 SHAWD manifold and TB swap. There are dyno proven gains on VsixP and on here by Sonnick. I wouldn't bother if you're still on the stock manifold/ TB, unless it's all ported.
ok, thats what i thought. thanks
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Old Mar 17, 2013 | 09:05 AM
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Can't wait for the DIY!!
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Old Mar 17, 2013 | 07:51 PM
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What's wrong with my stock Intake manifold and TB?... All those civics and rsx's want the tl-s throttle body...
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Old Mar 17, 2013 | 10:59 PM
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4" intake! Sick!
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Old Mar 18, 2013 | 12:17 PM
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Interested...
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Old Mar 18, 2013 | 02:55 PM
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Old Mar 18, 2013 | 03:38 PM
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Got the couplers and clamps and filter. Awaiting on the piping!
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Old Mar 18, 2013 | 03:39 PM
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Still debating whether or not I should make the threaded hole for IAT sensor and the pipe for crankcase ventilation hose.
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Old Mar 20, 2013 | 01:33 AM
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Originally Posted by paperboy42190
Still debating whether or not I should make the threaded hole for IAT sensor and the pipe for crankcase ventilation hose.
do
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Old Mar 20, 2013 | 11:13 AM
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Originally Posted by paperboy42190
What's wrong with my stock Intake manifold and TB?... All those civics and rsx's want the tl-s throttle body...
Nothing is wrong with it lol. Usually the Civic's (not RSX's because they are cable throttle) want the larger TBs because they are porting their stock IM (RBC) or RRC to match the throttle body. The 4" CAI may not give you all that much gain on the stock IM/TB. You may get a couple HP, but you won't see much gains until you do the 3.7 setup. My dyno is on here somewhere, but I gained 8-10whp/tq in the midrange and 2 peak with my 4" velocity stack setup OVER my AEM V1.
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Old Mar 21, 2013 | 12:55 AM
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hrmmm interesting
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Old Mar 21, 2013 | 02:33 AM
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Old Mar 21, 2013 | 04:42 AM
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Looks great! Let us know how she feels/ sounds over your old one.
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Old Mar 21, 2013 | 08:04 AM
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Looks good man. It will sound deeper for sure. Again, not sure you're gonna gain all that much considering you are on the stock IM/TB. With that said, below is my dyno before/after the 4" CAI on my 3.0L Accord with the 3.7 IM/TB setup.

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Old Mar 21, 2013 | 08:15 AM
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Here's the setup I got in the mail yesterday...pretty much what you're looking for lol

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Old Mar 21, 2013 | 10:30 AM
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Thats massive! and looks badass! you should get the tubing powder coated
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Old Mar 21, 2013 | 01:55 PM
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I believe you use the same tubing as myself. How much did you cut off?
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Old Mar 21, 2013 | 09:24 PM
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Parts needed:

3x 4.25" clamps
1x 45 degree 4" coupler
1x 3"-4" reducer coupler
1x 4" piping, 90 degree bend, centerline radius 6", tangent length 8"
1x 4' K&N filter RF1015

everything is available through ebay, cost me $112 shipped.

For the piping, I cut off 2" on 1 end, and 6" on the other end. In retrospect, 1" cut instead of 2" probably would have been better but it'll still work.
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Old Mar 21, 2013 | 09:42 PM
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popcorn anyone?
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Old Mar 21, 2013 | 09:44 PM
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I forgot to mention the battery Cover will not close properly after this mod, the battery will be moved about 5mm to the left so the clips don't line up
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Old Mar 21, 2013 | 09:54 PM
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takeda intakes have a 4inch taper to 3 1/2 to a 3inch all the way to the throttle body. no compromise for low end and top end. i happen to own one.

so by doing a 4inch intake what is the benefit?
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Old Mar 21, 2013 | 10:18 PM
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Originally Posted by kingkong_dav
takeda intakes have a 4inch taper to 3 1/2 to a 3inch all the way to the throttle body. no compromise for low end and top end. i happen to own one.

so by doing a 4inch intake what is the benefit?
Umm, airflow?
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Old Mar 21, 2013 | 10:23 PM
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moar power? or moar popcorn. hahaa
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Old Mar 22, 2013 | 01:45 AM
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well the difference between these intakes are marginal at best I won't deny that, however given my recent jpipe and atlp exhaust additions, i think the 4" cai complimented it very well. I honestly feel like I gained some top end power with this intake, low and mid feels the same to me. some might say its psychological too and flame me for saying the intake made the car faster. what's for sure is that it sounds nice!
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Old Mar 22, 2013 | 08:02 AM
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this makes me wanna do, but I dont have any supporting mods to make it even worth doing.
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Old Mar 22, 2013 | 10:27 AM
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^ Wouldn't be worth it for you, unless you plan on doing more mods in the future.
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Old Mar 22, 2013 | 11:24 AM
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My theory:

* With your current modifications, adding the intake will cause power loss because of A/F unbalanced.

Having manifold or TB pnp'd would probably be the benefit of having a bigger intake. Since our vtec point is already set so high, having bigger pipings will have little impact down low RPM's but for more high revving RPM's. The stock cams love the mid range RPM power so even out your performance mods on where you want the power to boost. On a Kseries (i-Vtec), they are different as they see 8K - 9K RPM's and bigger is better for them and their vtec starts right at 4K- 4.5K depending on their power mods as well.

Last edited by bouncer07; Mar 22, 2013 at 11:29 AM.
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Old Mar 22, 2013 | 11:50 AM
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Originally Posted by Sonnick
^ Wouldn't be worth it for you, unless you plan on doing more mods in the future.
Ya, Im prolly just gonna do the resonator delete for sound and save my money. prolly not gonna do any power enhancing mods since I want to keep somewhat stock. I have a hard time keeping vehicles for long. and if kept fresh and somewhat stock ill get more money back when comes time to sell. I feel if I wanted a fast car I got to start with a car that is already fast. takes too much money to get a slow car to go fast. TL is pretty quick out of the box at least for me so im happy with it the way it is.
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Old Mar 22, 2013 | 12:57 PM
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Originally Posted by paperboy42190
Parts needed:

3x 4.25" clamps
1x 45 degree 4" coupler
1x 3"-4" reducer coupler
1x 4" piping, 90 degree bend, centerline radius 6", tangent length 8"
1x 4' K&N filter RF1015

everything is available through ebay, cost me $112 shipped.

For the piping, I cut off 2" on 1 end, and 6" on the other end. In retrospect, 1" cut instead of 2" probably would have been better but it'll still work.
Interesting.. So there is about 1-1.5 inch difference between the accord an tl. I made a trial one for a member and he couldn't get it to fit because I cut it to spec for an accord thinking it was the same. Once I found out it wasn't I sent him a 6" extension to more than make up the loss and for whatever reason it still didn't fit for him. However looking at this, I see no reason why it wouldn't.. Odd.
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Old Mar 22, 2013 | 01:39 PM
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Paperboy, what did you do with the breather hose from the manifold? I believe some people are just using a small filter on the end of it. I also have the IAT sensor to deal with since I have no provision for it on the 3.7 manifold. I can either relocate it under the front bumper or drill and have a bung welded into the 4" intake, which is what I'd rather do. Might as well weld on a second port for the breather hose while I'm there.
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Old Mar 22, 2013 | 02:00 PM
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Originally Posted by paperboy42190
I forgot to mention the battery Cover will not close properly after this mod, the battery will be moved about 5mm to the left so the clips don't line up
Will I have this issue if I use 3.5" piping?
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Old Mar 22, 2013 | 04:38 PM
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Just lose the battery cover altogether with the rest of the heat trapping engine covers.
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Old Mar 22, 2013 | 04:51 PM
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^^ Mine fit with the cover in place.
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Old Mar 22, 2013 | 04:55 PM
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NvrDwn, are you still making intakes or no?
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Old Mar 24, 2013 | 05:21 PM
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Originally Posted by vill0169
Here's the setup I got in the mail yesterday...pretty much what you're looking for lol

airraid UBI intake FOR THE WIN! that is what I used to make mine. Good stuff
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