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View Full Version : DIY: custom cold air stock airbox



black05ep
12-11-2010, 03:37 PM
i know a few people have posted about this and also asked me to post some pics a few months ago. i got a little busy and just didnt have to time so im going to post some pics for them.i apologize for taking so long for the guys with questions.

http://i574.photobucket.com/albums/ss185/black05ep/Mobile%20Uploads/49.jpg
http://i574.photobucket.com/albums/ss185/black05ep/Mobile%20Uploads/46.jpg
http://i574.photobucket.com/albums/ss185/black05ep/Mobile%20Uploads/2010-12-08_14-05-47_359.jpg
http://i574.photobucket.com/albums/ss185/black05ep/Mobile%20Uploads/0403001451a.jpg
http://i574.photobucket.com/albums/ss185/black05ep/Mobile%20Uploads/0403001451.jpg

RickEP3
12-11-2010, 06:47 PM
I'd never actually seen pictures of this, cool.

whatsvtec
12-11-2010, 10:04 PM
Pretty neat, gonna try it out sometime in the spring

ttttrigg3r
12-11-2010, 10:05 PM
Whoa that looks radical. So you've cut a hole in your bumper and run your pipe to that? I'd imagine all sorts of shit getting in their making your engine bay and filter dirty faster.

whatsvtec
12-11-2010, 10:19 PM
I think he routed it to the drivers side bumper, and just took off the side-marker to let it breathe more.

black05ep
12-12-2010, 09:43 AM
thanks. it works great i dont suck up any water tho i do suck up leaves and dirt occasionally.i also have a spoon air filter now, but i didnt when i first made this. i get better torque keeping the airbox in but get better mid and top end with the cold air tube. i had to cut up the battery shroud and shove it out of the way but the tube keeps the battery from moving around. i think the tube was 10 dollars or 15. i used the stock airtube to use for the velocity stack in the bumper since it angled to the opening.i have 2 ideas im going to work on soon. 1 of them is making a piece that actually fits into the sidemarker light hole that goes directly up the tube instead of it sitting inside. as for the engine bay getting dirty. it really doesnt get any dirtier than normal. although my engine bay gets cleaned once a month it doesnt get bad. ill posts some pics of that to.

Twisted-X
12-12-2010, 11:19 AM
This is a cool idea, I'd actually thought about getting a CF hood with louvers and routing a duct to one of those.
Some mods to think about: The hondata airbox mod, and maybe getting some type of screen to cover the sidemarker hole to filter out the large stuff.

black05ep
12-12-2010, 12:05 PM
i have the hondata mod but if you look at the 5th picture youll see that i capped the hole off so the air doesnt route into that section of the box and it all goes directly to the filter. and the screen ive thought about to.i plan on doing that as well.. and the hood with louvres. i have a 93 sedan and a spare hood that i had actually cut and welded custom scoops for each side of the hood and one of them goes right over the intake. but since i could only spot weld each spot and had alot of fiberglassing to do the project ended up falling thru and i just stopped. but it looked sweet in the process.

geeio
12-12-2010, 07:47 PM
so do you have the air box cut open or not? its a lot like the air box mod with cold air that the ctr owners club was doing. ive got a piece of vinal tubing that goes from the opening of the air box to the cut out next to the battery. i just wish i could hear the intake more. i think for that i might have to do something to the top end of the air box.

black05ep
12-12-2010, 08:05 PM
no. that pic is just to show i have the 2nd chamber blocked off. the whole airbox is together though. the reason you cant hear it is beacuse its not an open element air filter. i can hear the intake sucking if i get down beside it and put my ear by the opeining. butif you want the intake sound to hear youll have to go open element intake.. nothing you do to the airbox is actualy going to give you the intake sound. tthat your looking for. im just trying to make it more efficient at high rpms like an intake while keeping the mid/low range power of the box at low rpms.

McTaggart34
12-13-2010, 05:38 PM
Looks good.
Where did you get the hose ?
Would it be the same as this ( http://www.spectreperformance.com/#CATALOG.8741 )

black05ep
12-13-2010, 05:55 PM
yep the 3 inch ducting is what i got. got it from advance auto. like 15 dollars i think.

civictype_r04
12-15-2010, 11:54 AM
awesome idea man!!!!

black05ep
12-16-2010, 02:08 PM
thanks. it works really well. although the engine bay doesnt look quite as "cool" wihtout some colored or polished intake. i still like it.

civicsmoke420
06-29-2011, 12:28 PM
I did this mod after seeing your write-up and I love it! It makes better, more consistent power throughout the powerband. I am just wondering if you have thought about doing the Hondata air box mod with it. Do you think it would add any significant power? I don't want to cut up the stock air box if I dont absolutely have to.

Jukka
06-29-2011, 12:37 PM
I have the hondata mod done + a flexible intake hose similar to this one on my setup and love it. I didnt route mine down like that, but instead its routed up to the front grill instead. I love this setup..been running it for over a year and a half now.

civicsmoke420
06-29-2011, 10:46 PM
Nice! I just want to know if anyone has noticed a difference between before the Hondata mod and after the mod. I dont wanna tear up stock parts If I dont have to. I have been running a K&N typhoon short ram before this mod. And, sadly, this mod is soooooo much more effective. After this I actually have put my Typhoon on eBay because its useless. My Ep is being kept as a sleeper. People here in Alabama think that hatches are shit. Until they get smoked. And at the next light their like "Holy Shit!! What are you runnin?" lol. EP's!!! FTW!!!

lemonhead228
07-04-2011, 01:48 AM
This is a badass idea. Pretty kool how ppl innovate the stock stuff to save money but at the same time producing more power than some of the aftermarket parts

theMan_ny
12-11-2011, 04:51 PM
Has anyone the run duct with a mushroom filter or some sort of other filtration in the front lower grill to prevent leaves, dirt, etc from going in to the airbox? I been thinking about doing it for a while now but haven't had a chance to do it.

tlikethedrink
03-07-2012, 10:58 PM
I have the hondata mod done + a flexible intake hose similar to this one on my setup and love it. I didnt route mine down like that, but instead its routed up to the front grill instead. I love this setup..been running it for over a year and a half now.

pics please : )

tlikethedrink
03-07-2012, 11:00 PM
Has anyone the run duct with a mushroom filter or some sort of other filtration in the front lower grill to prevent leaves, dirt, etc from going in to the airbox? I been thinking about doing it for a while now but haven't had a chance to do it.

i think the filter on the front might be restrictive. a mesh might work. the air filter should be plenty.

bluedemonep3
03-07-2012, 11:18 PM
pics please : )

I second that motion lol

AKEP
03-08-2012, 03:38 AM
should put the velocity stack in the foglight spot in the bumper, if you don't have a fog light.
or be awesome and take one out lol.

tlikethedrink
03-08-2012, 09:16 AM
ive seen a bumper cut out for a stack, some guy with a vtec killer set up had it. idk if he built a short intake that leads to or not. looked pretty sick tho, and a built intake like that would sound gnarly! also on hondatech, maybe a member here, a guy did make a fog light "snorkel"... he has a mugen intake tho.

looked right quick to find vids/pics:

<iframe width="420" height="315" src="http://www.youtube.com/embed/a9d6Stj-eHc" frameborder="0" allowfullscreen></iframe>
http://www.flickr.com/photos/69181254@N04/6289708733/
http://www.flickr.com/photos/69181254@N04/6289708203/



my idea was to put a stack behind the grill on the right side. a chrome one would look sick behind the SI lol. i just reinstalled my modded airbox yesterday... ill def be trying this this summer.

theMan_ny
03-08-2012, 12:52 PM
i think the filter on the front might be restrictive. a mesh might work. the air filter should be plenty.

Hmmm. So the stock airbox filter should catch all the leafs and stuff? I'm probably putting my stock intake again run a duct with an extra filter just to be safe since I live in the desert.

Slip_Angle
03-08-2012, 07:19 PM
thanks. it works really well. although the engine bay doesnt look quite as "cool" wihtout some colored or polished intake. i still like it.

Have you measured air intake temps with the pipe in place?

tlikethedrink
03-08-2012, 11:18 PM
Hmmm. So the stock airbox filter should catch all the leafs and stuff? I'm probably putting my stock intake again run a duct with an extra filter just to be safe since I live in the desert.

yep. you will find them in the box when you clean out your filter... i live in a dusty desert too! that's why i wanted to get rid of an open element filter.

tlikethedrink
03-08-2012, 11:29 PM
thought i would add a picture my airbox:
http://i41.photobucket.com/albums/e285/aranciors/a5216667.jpg

straight shot to the filter:
http://i41.photobucket.com/albums/e285/aranciors/f4ef11d1.jpg

i was pretty proud of how much of the stock box i got rid of...kinda scary while i hacking away. about half ways i thought out loud "what have i done..." lol

imagine looking at this "half way through"!
http://i41.photobucket.com/albums/e285/aranciors/2823f45e.jpg

theMan_ny
03-08-2012, 11:41 PM
I'm putting my stock intake back again. I read your other thread and made me realize that the CAI isn't worth it. lol. I need the best MPG I can get now since gas just keeps getting expensive.

tlikethedrink
03-12-2012, 07:01 PM
I'm putting my stock intake back again. I read your other thread and made me realize that the CAI isn't worth it. lol. I need the best MPG I can get now since gas just keeps getting expensive.

yeah no kidding. it paid 3.7x the other day. my mpgs were not hurt too much by the mods actually. i think my avg is about 28-29 with bolt-ons, with stock exhaust and modded airbox i got about the same on my road trip this past weekend. but then again i was doing about 85-90mp- not a fair comparison.

the airbox itself isnt a bad mod all on its own.now all i need is a k and n filter.

SHG_EasyE
03-12-2012, 08:09 PM
Hey guys, just some food for thought that puts alot of misconceptions to rest...

Last year i did an oem airbox test with a stock unit, hondata modded unit, and my own Iteration which is a Hondata mod with reliefs cut in the lower panels to experiment with more direct air flow.

Here is my custom version:

http://i159.photobucket.com/albums/t131/sohonda_garage/P1090826-1.jpg

.

.

Had the scan tool up for live data to make sure coolant temp and air intake temp were the same for each pull.

http://i159.photobucket.com/albums/t131/sohonda_garage/P1090827-1.jpg

.

.

The results speak for themselves... Stock box made massive torque over both modded units and gained a little horsepower over the whole curve. It was a hot muggy day so the numbers we saw were pretty low (car made 132 on the same dyno with the shg box the previous spring) Im sure adding more cool air would have made it perform even better.

Dotted green line - Stock
Dashed green line- Hondata mod
Yellow line - SHG/Hondata mod

http://i159.photobucket.com/albums/t131/sohonda_garage/SHG_AirboxTest.jpg

SHG_EasyE
03-12-2012, 08:12 PM
Im going to do a cool air duct but ill be routing it down in front of the trans to a NACA duct in the splash shield. Ill also be putting a bypass filter in the hose to prevent sucking up water.

Slip_Angle
03-12-2012, 09:17 PM
Im going to do a cool air duct but ill be routing it down in front of the trans to a NACA duct in the splash shield. Ill also be putting a bypass filter in the hose to prevent sucking up water.

Great information. I currently have a custom CAI with my k24a2 but have been pondering the install of an airbox style intake such as an ARC, Mugen or stock /w cold air pipe like you mention. I've been trying to research the pros and cons of airbox's vs. tube based intakes so any information you can shed based on your experiences would be great.

What designs are used in racing? How should length and diameter be determined? For box intakes I read an article that showed adding directional air vanes created 12% better air flow...

tlikethedrink
03-13-2012, 01:01 AM
in comparison to the AEM V2 i say there was a definite bump in low end torque with the stock air box (hondata mod). i wonder how much was gained up top with the intake...

Slip_Angle
03-19-2012, 09:54 PM
I was browsing Real Time Racing's Facebook page and they had a sneak peak video of their GTS class TSX with V6. I watched the video and noticed they use a tube intake with an airbox sandwiched in-between so I asked this question...

"Curious, why does RTR use an airbox vs a tube based intake running to a colder air source? My understanding is tube intake make better power. Is this due to rules or something else?"

in which Peter Cunnigham responded...

"We've found this set up to be best for us. If we didn't believe it, we wouldn't run it this way..."

Most interesting. They don't do this because of any rules. This is their choice of intake.

I would love to understand why.. I may build something similar for the EP.

5822

tlikethedrink
03-25-2012, 06:53 PM
that looks pretty interesting... kinda reminds me of a compressed version of the comptech intake for our cars... i doubt thats a production model...

a quick little update: i got my K&N filter... i was thinking about that spectere hose while i was at it since i had 20bucks on my autozone rewards card lol. i just used it on the filter itself tho, 30 bucks for a K&N FTW! im going to a hardware store to see if i can find some dryer hose for cheap- should work just as well plus a little bling haha. im thinking of just routing the hose to the front grill and scrapping the whole velocity stack plan- keep it simple and cheap.

decided to hold on to the AEM v2 intake too. maybe one day ill slap it on for kicks...

tlikethedrink
03-27-2012, 07:58 AM
Update:
While shopping around I found that RV waste hose would work perfect... 3in diam, steel coil reenforced and only cost like 7 bucks for 20ft! I decided to hold off still- I don't want to have 17ft of RV waste hose around the house for no reason lol. I found a 10 ft for 5 but it was brown... The search continues! Pics when done!!

On another note... I was trying to find somewhere to route the new duct... I'm not sure it'll fit where I thought it would.. I'm gonna have to take a better look: routing the duct like a CIA may be the way to go

sleepy ep3
03-27-2012, 10:35 AM
needs moar boost

MugenReplica
03-27-2012, 11:08 AM
I've always liked this custom air pickup for the stock airbox....

http://img.photobucket.com/albums/v211/EP3SINY/king.jpg

On some of the minikara pages from the Japanese "Ep3 Lovers" you can see they also use heat reflective tape on the outside of their airbox.

http://img.photobucket.com/albums/v211/EP3SINY/ModdedairboxEp3r2.jpg

http://img.photobucket.com/albums/v211/EP3SINY/ModdedairboxEP3R.jpg

*Neither are Ep3/RSX airbox pics, but you get the idea*
http://1.bp.blogspot.com/-EZ8lgow-dXU/TxnLsvIzcXI/AAAAAAAAAZo/m33Uw9iMuBA/s320/Cut-out+for+MAF.JPG

http://4.bp.blogspot.com/_8ROwxYw9La0/TKKke1QLH-I/AAAAAAAAACY/U9qZvrjWdP8/s320/Picture0048.jpg

EP3Lov3
03-29-2012, 11:38 AM
Love the heat reflective tape idea, i did the same thing for my SRI when the radiator hose was touching the tubing.

tlikethedrink
04-12-2012, 05:36 AM
ive seen s2k boxes with insulation too... looks kinda eh, but if it works...
i wouldnt go that far on a stock box on a ep3, maybe with a k24a2 swap lol

tlikethedrink
04-12-2012, 05:48 AM
Love the heat reflective tape idea, i did the same thing for my SRI when the radiator hose was touching the tubing.

i did the same on my v2 intake : ]

black05ep
07-07-2012, 11:41 AM
that looks pretty interesting... kinda reminds me of a compressed version of the comptech intake for our cars... i doubt thats a production model...

a quick little update: i got my K&N filter... i was thinking about that spectere hose while i was at it since i had 20bucks on my autozone rewards card lol. i just used it on the filter itself tho, 30 bucks for a K&N FTW! im going to a hardware store to see if i can find some dryer hose for cheap- should work just as well plus a little bling haha. im thinking of just routing the hose to the front grill and scrapping the whole velocity stack plan- keep it simple and cheap.

decided to hold on to the AEM v2 intake too. maybe one day ill slap it on for kicks...

The thinb with the velocity stack is the design looks to make the air transition into the tube better.as opposed to a cut off straight tube.i painted my airbox with black hi temp paint. I thought about the reflective tape. Not sure how i felt about the looks.ive still been tying to think how i can get room to go to the foglight cutout. Anythoughts?

Jukka
07-07-2012, 12:27 PM
WOW...i thought I had posted a picture of my box in this thread. Its not the best picture, but it still shows the feed and box....
http://i240.photobucket.com/albums/ff213/6GCCanada/08012011040.jpg
You can see the cold air feed in the picture just slightly.
I did the whole heat-wrap thing on my box and it makes a decent difference in my intake temps. I just took my box out though and put in a ApexI intake.

black05ep
07-07-2012, 02:45 PM
WOW...i thought I had posted a picture of my box in this thread. Its not the best picture, but it still shows the feed and box....
http://i240.photobucket.com/albums/ff213/6GCCanada/08012011040.jpg
You can see the cold air feed in the picture just slightly.
I did the whole heat-wrap thing on my box and it makes a decent difference in my intake temps. I just took my box out though and put in a ApexI intake.

Where did you get that intake hose from? The one that goes the the top half? Ive been looking for one or making my own fron an ebay intake pipe.

Jukka
07-07-2012, 02:52 PM
its a Tegiwa Imports silicone intake hose. SFS, Tegiwa and SSR all make the silicone intake intake pipes. I got mine shipped from the UK like 2 years ago and love it.

black05ep
07-07-2012, 03:10 PM
Cool ill have to look into it. How much was it?

Jukka
07-07-2012, 06:24 PM
like $90 landed...but I bought a ton of stuff from them at the same time, so shipping wasn't too bad.

black05ep
07-07-2012, 06:55 PM
like $90 landed...but I bought a ton of stuff from them at the same time, so shipping wasn't too bad.

Gotcha. Sounds a little pricey for a silicone tube. I may just try the intake tube and cut it to fit. Love your sig. Inflames is awesome. Toobad about the guitarist leaving though.

SHG_EasyE
07-22-2012, 09:05 PM
Just looking back on the thread now on the topic of heat tape I had done the bottom of my box about a year ago after my airbox test. No intake air temp data though. Still havent gotten a chance to run a cool air duct either, so many other projects on the car have take priority, but some day it will get done! lol

http://i159.photobucket.com/albums/t131/sohonda_garage/P1090869.jpg

http://i159.photobucket.com/albums/t131/sohonda_garage/P1110627.jpg

black05ep
07-23-2012, 06:40 AM
Just looking back on the thread now on the topic of heat tape I had done the bottom of my box about a year ago after my airbox test. No intake air temp data though. Still havent gotten a chance to run a cool air duct either, so many other projects on the car have take priority, but some day it will get done! lol

http://i159.photobucket.com/albums/t131/sohonda_garage/P1090869.jpg

http://i159.photobucket.com/albums/t131/sohonda_garage/P1110627.jpg

Thats pretty similar to mine. I did the top half of the box as well but only the side next to the engine. Doesnt look tacky. Cant really tell unless you get up on the side and look.. i also used gorilla tape and blocked off both ports to the top tube. I kno it sounds bad using tape. But that shit is strong.its been about a week and im going to check it again later to day and see how it holds up. I didnt really notice too much differance at first but now im noticing a little better pick up.my throttle sticks a little which i feel affects it as well.does anyone know how to lube the throttle cable?

black05ep
07-23-2012, 06:46 AM
Where is your car from? The engine bay looks slightly differant than mine. Mostly that tank beside your washer fluid and your battery.

SHG_EasyE
07-23-2012, 09:18 AM
Where is your car from? The engine bay looks slightly differant than mine. Mostly that tank beside your washer fluid and your battery.

Its a US model. If you look closely you'll see that I've retrofitted the car with an 06 RSX Type S hydraulic power steering setup, so the left side of the bay looks a bit different than what you're used to seeing. The battery is mounted in a custom tray so its positioned a bit different than stock.

black05ep
07-23-2012, 11:08 AM
I thought something was odd about it. Whats the reason for he powersteering change?

black05ep
07-23-2012, 11:11 AM
Btw about the heat tape. After a few spirited dri es. I reach to the airbox and notice the tape side is hot but the oppiside side of the box is much cooler than it used to be before the tape.

tlikethedrink
09-24-2012, 09:31 PM
just another thing i saw, the K&N apollo kit. i think it may work well with the induction hose run straight down away from all the heat.

http://www.civinfo.com/forum/items-sale/74494-k-n-apollo-kit-samco-silicone-pipe-bend.html

ep32424
09-28-2012, 09:56 PM
dame crazy stuff

Twisted-X
10-20-2012, 03:04 PM
This may seem cheap/ghetto, but what about using an inline airbox?
http://www.summitracing.com/parts/SPE-9833/
http://static.summitracing.com/global/images/prod/norm/spe-9833_w_m.jpg
Supposedly it flows 650 cfm, do you guys think it would be enough?