Drilled stock airbox

[detroiter]

I was cleaning out the garage and found a second stock airbox configuration that I forgot I had. I was thinking about the airbox mod that's been here on the forum for a long time and figured, why not? So ended up drilling nickle sized holes in 3-5 lines all the way around the lower box. Needless to say, I wish I would have done this a long time ago, reminds me of the growl and sound the AFE intake gave me but obviously as a much lower price. That's not to say the AFE or any other intake is a bad thing, they look much nicer than a stock airbox. But if you're on a budget, it's a mod that's worth looking into:thumbsup:

I'd like to give ChinoCharles credit for this one. It's his thread that gave me the idea to go ahead and make it happen.

[malibuguy]

You should remove the carbon trap so you might make use of the additional available flow

[detroiter]

Thanks for the tip! Any effect on the MAF sensor though? So far I don't really see any change in MPGs or anything like that, just much louder (and nicer sounding!) under acceleration.

[ilikerice]

Removing that wont effect the MAF sensor.

[Thirty-Nine]

I did this exact same thing when I first had my Yaris in 2007. Adds a nice sound.

[7:34pm]

I'm bored and have the day off... so what size drill bit are we using, and we're drilling below the panel correct?

[Thirty-Nine]

Here's what I did.

http://www.subcompactculture.com/2008/03/better-breathing-for-my-yaris.html

[detroiter]

Wow and I thought mine looked awesome lol. Good job!

[monchito18]

Here's what I did.

http://www.subcompactculture.com/2008/03/better-breathing-for-my-yaris.html

How does it sound?

[detroiter]

Here's basically what I did...goes all the way around the lower portion of the intake box

http://i4.photobucket.com/albums/y104/maidenfan84/IMG_6925.jpg (http://s4.photobucket.com/user/maidenfan84/media/IMG_6925.jpg.html)
http://i4.photobucket.com/albums/y104/maidenfan84/IMG_3887.jpg (http://s4.photobucket.com/user/maidenfan84/media/IMG_3887.jpg.html)

[Exiwolfman]

[QUOTE=detroiter;735854]Here's basically what I did...goes all the way around the lower portion of the intake box

that should make for some cool sound ...if u can post sound with intake running that would be fantastic .

One question ...what style air cone makes most sound open or closed end ?

[detroiter]

At lower rpms with hard acceleration, it kind of reminds me of a boxer engine from a Subaru WRX. At higher rpm hard acceleration, reminds me of some Honda VTEC hah.

I'm using a high flow air filter as well.

[trunkout]

Here's basically what I did...goes all the way around the lower portion of the intake box

http://i4.photobucket.com/albums/y104/maidenfan84/IMG_6925.jpg (http://s4.photobucket.com/user/maidenfan84/media/IMG_6925.jpg.html)
http://i4.photobucket.com/albums/y104/maidenfan84/IMG_3887.jpg (http://s4.photobucket.com/user/maidenfan84/media/IMG_3887.jpg.html)

DOING THIS THIS WEEKEND!

[yariseggvvti]

I didnt drill any holes in the box. What I had done is took out the tube from the lower air cleaner box and put a K&N drop in filter. Sounds deep and once the VVTi active is screming.

[detroiter]

I've had the "elephant trunk" tube off for a long time...it does add a deeper sound. Once the holes are added, it's MUCH deeper than that.

[Silver Streak]

Not to burst your bubble guys, but with summer right around the corner aren't you worried about all that under hood heat getting sucked into your airbox?

[monchito18]

Not to burst your bubble guys, but with summer right around the corner aren't you worried about all that under hood heat getting sucked into your airbox?

I live in Puerto Rico and the car hasn't broken down and I don't have the tube.

[Silver Streak]

Oh no, I wasn't saying it would break down. It will run fine, it's just that the cooler the air is entering your intake the better the car will perform.

[monchito18]

Oh no, I wasn't saying it would break down. It will run fine, it's just that the cooler the air is entering your intake the better the car will perform.

I know what I mean is that temperatures here are 90+ degrees Fahrenheit all year long, now in summer get up to 100 and even more and I drive it like that hahaha

[Thirty-Nine]

How does it sound?

It sounded great at WOT. I have the K&N Typhoon now.

As far as heat soak, any short-ram-style intake is going to likely suck in warm air. They're probably more of a noise maker than anything.

Most stock intakes are designed so well these days that it's unlikely any gains of more than 1-2 hp could be made if that unless you're already making serious power (e.g. Garm's old Yaris).

[CrankyOldMan]

While I agree that opening up the intake does add some fun noises, nothing compares with that of a Blitz near redline through an aluminum intake tube. *Bweeeeee!* =)

[detroiter]

I'm going to try uploading a video from the phone for an example.

[Rigaud]

It sounded great at WOT. I have the K&N Typhoon now.

As far as heat soak, any short-ram-style intake is going to likely suck in warm air. They're probably more of a noise maker than anything.

Most stock intakes are designed so well these days that it's unlikely any gains of more than 1-2 hp could be made if that unless you're already making serious power (e.g. Garm's old Yaris).

On a 1.5L engine you don't get more then maybe .5 h.p., better throttle response and noise. Whether a short-ram or a long cold air intake theirs no power gain really. Been a lot of studies and research on that and like you mention, their so well designed now. On bigger engines 5.0L and bigger theirs an increase.

[trunkout]

DONE! sounds better and seems to "lean burn" better too! Now I can't decide if my engine or exhaust is louder!

:headbang:

[adf_604]

Sorry to revive an old thread but saw this mod recently and used it on my car just today. Worked great and also removed the so-called "elephant trunk" intake pipe, sounds pretty good!

thx to OP.

[robbadobba82]

Forgive me guys but all of this sounds amazing and I will do it tonight. Could someone post pick of the "elephant" tube and what the engine bay looks like without it?

[robbadobba82]

Figured it out! Sounds great!

[driverofchuckles]

Here's basically what I did...goes all the way around the lower portion of the intake box

http://i4.photobucket.com/albums/y104/maidenfan84/IMG_6925.jpg (http://s4.photobucket.com/user/maidenfan84/media/IMG_6925.jpg.html)
http://i4.photobucket.com/albums/y104/maidenfan84/IMG_3887.jpg (http://s4.photobucket.com/user/maidenfan84/media/IMG_3887.jpg.html)

Getting ready to drill this exact moment!

[David C]

Did mine too and I did remove the neg from the battery for over a minute to reset the ECU, and since then I've noticed the car would reach higher RPM on strong acceleration before shifting gear (automatic transmission) that it did before. Looking at my fuel gauge (I filled up right after doing the mod), it seems I'm getting very poor mileage so far, but it could be due to many other factors, like the gas station auto-stop fuelling setting, the colder weather that just started (thus using the PTC heater more and blower fan more), etc. Perhaps the ECU needs more time to recalibrate with the air/fuel flow during fast acceleration. I would reach 4 000rpm easily from a dead stop before first first while before it wouldn't go beyond 3 500 rpm. Good/bad ?

[jcboy]

Did mine too and I did remove the neg from the battery for over a minute to reset the ECU, and since then I've noticed the car would reach higher RPM on strong acceleration before shifting gear (automatic transmission) that it did before. Looking at my fuel gauge (I filled up right after doing the mod), it seems I'm getting very poor mileage so far, but it could be due to many other factors, like the gas station auto-stop fuelling setting, the colder weather that just started (thus using the PTC heater more and blower fan more), etc. Perhaps the ECU needs more time to recalibrate with the air/fuel flow during fast acceleration. I would reach 4 000rpm easily from a dead stop before first first while before it wouldn't go beyond 3 500 rpm. Good/bad ?
I believe the fuel ratio is maintained by the ecu so if you are feeding more air, your fuel consumption will also suffer.


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[tmontague]

fwiw I have a short ram (modified my TRD CAI) and to aid in the heat soak I used 3" plastic heater ducting and cut a hole in my fog light cowling and ran the ducting up into the engine bay where it ends right at the air filter. The ducting it zip tied in 2 spot on the cowling and one spot in the engine bay

This won't do much when stopped but once moving air is forced into the ducting and flows out over the filter and essentially gets rid of heat soak.

I don't have any dyno's to compare but it cost me $5 and about 15 mins to do. Also doesn't look too bad either.