DIY: Airbox mod - Cool Air Injector (anti-56k)
 

Edit: After some suggestions in this thread i got larger diameter piping and have updated the DIY accordingly... enjoy

this is a simple modification, that only cost about $12, took roughly 25 minutes total, and that i hope will redirect some outside air into the stock airbox, which i believe is best for these cars.

Here is all that you need, PVC conduit elbow 1-1/4'', pvc 45 degree elbow connector, 2x2 plastic flashing. (flashing was on the top shelf above the pvc fittings at Ace)

conduit elbow (pvc)
Attachment 235983


45 degree connector for 1-1/4'' pvc
Attachment 235984

plastic flashing
Attachment 235985
Attachment 235986
Attachment 235987

reciept
Attachment 235988

before I left the store, I made sure everything fit. the fitting fits on the end of the pipe, and should fit snuggly in the rubber seal on the flashing.

Attachment 235989
Attachment 235990


first i turned the wheel all the way to the right, and removed the wheel liner, like you would do if you were changing the bulbs in the driver's side headlight

under the stock airbox, is a resonator bottle that looks like this
http://i11.photobucket.com/albums/a1..._/P1000630.jpg Attachment 235991

it goes in here...
http://i11.photobucket.com/albums/a1..._/P1000613.jpg

i used an 8mm wrench to remove the two bolts holding it on, and pulled it down, to dislodge it from the airbox. it should look like the above pic when out.

after that i pulled the big piece of foam out a few inches, so see where it was connected..
Attachment 235992
it's held in by that big black plastic square, which is held on by two easy clips, one was fairly obvious, and easy to reach.

the other i had to reach through the lower part of the front grille with a screwdriver,
Attachment 235993

i broke my foam taking it out, but what the heck. i can get more foam.

next, I fit the plastic flashing piece against the front (lower) grille, so that air will trap in there. I was able to secure mine by putting the top flap between the plastic box piece (that sits above the foam), and the grille.

insert it like that^, then bend the flap nearest you on top and pull it through the bend of the box, and pull the whole piece toward you to line up with the pipe... this should wedge it and secure it real tight...

you'll know what i mean when you get under there...

Attachment 235994


the 45 degree elbow is to make the required bend to reach the flashing. i had to size it up before determining the proper way it should face before tightening it on.

after i decided which way to face the connector, i tightened it on the pipe, and pushed it through the rubber seal on the flashing almost all the way through, still with the pipe turned sideways like so...

Attachment 235995

then i turned it upward to reach the airbox hole.

Attachment 235996


I wanted to try and make sure and push the pipe through enough so that when i inserted the other end into the airbox, it pulled back out a little from the flashing... this way the rubber seal goes inward toward the pipe, creating more of a funnel effect. the bare end of the pvc pipe should fit very snugly into the hole on the bottom of the airbox, though you may need to wrap it with some tape or something... it should go all the way up into the airbox like so.
Attachment 235997
Attachment 235998
... it should all be very nice and tight, but of course that's what she said.

Coupe fitment pic courtesy MikeGrote (See post #70)
Attachment 235999

complete...

Attachment 236000
Attachment 236001


disclaimer: i am not responsible for anything you do to your own car, nor is this description of what i did, in any way, an encouragement to do, or endorsement of what i did. i'm simply telling a story. :biggthumpup:

Interesting, did it change the sound at all?

doesnt seem like it would do much

You'd want some kind of velocity stack or collector down there for it to be truly effective... larger piping wouldn't hurt either...

abysmal gains. You need larger piping

That hose/piping is so small I don't see how that will do much, if anything.

Hey, +1 good idea. I agree with some sort of collector down there and large piping to catch more air. but awesome concept. Keep us posted.

will do; i'll be going back up to ace hardware tomorrow to find some kind of funnel i will use to attach to the end of that hose, and to the back of the grille. hopefully that will direct some major air when at speed. and yes the tubing is kinda small, but the airvolume is prolly about the same as the 'power-duct' since it doesn't have a very big opening to the outside... the airbox just seems blocked from the two directions it gets airflow... this will add a third air passage, and it should be more effective than the oither two, since it's directly in the airflow

edit: i got the larger piping, and updated the OP with new pics.

I think this is the beginning of a very good idea.

Somewhat like that duct that the Z guys put through their bumper, if we put a larger hose and a finished looking duct there, it would look decent and would have more function.

Since it's not the only hole, I don't think water would be a problem...


Adrian

MOD COMPLETED!!! i went back to the store to get bigger piping, and when i tried to rig it up, the larger piping fit perfectly by itself, into the stock airbox hole. no connectors needed!! i only needed one connector to bend toward the 'funnel', which i used plastic flashing for.

you guys inadvertedly made this mod work, by suggesting larger piping.

the DIY has been updated and is now complete

cool nice little DIY you did

ummmmm, why no just go with a CAI? The have a much larger diameter tubing and it gets rid of the restrictive stock air box.

dude, good thinking even if it doesn't give 400 extra hp it can't hurt.

Try larger pipes and paint the tip so it doesn't look like white PVC pipe stuck in your G, LOL.

CAI don't do squat. This is just a way of redirecting cold air without having to go with a long-ram intake setup.

IMO, its a great approach.

.

Sure that's going to work. At least, it would duct colder air into the air filter + $13 won't hurt our thin pockets. Great job.