Trash Can + pizza tray + hose = Cold Air Intake
 

Hi people, when I bought my car it came with a HOT air intake instead of the stock air filter and we all know that our engines are too hot and hotter air is not good for them.

I was searching for Cold Air Intakes and found that there are mainly two options:
1. Moving the air filter to the outside of the engine bay, which usually means removing the windshield washer reservoir.
2. Building a fresh air box around the filter inside the engine bay.

I don´t want to loose my windshield washer functionality, nor complex relocation of its reservoir, so I ended with a kind of option 2 approach, but not exactly a box, but a bucket...

How to convert a trash can, a pizza tray and some radiator hose into a cold air intake? Well, it takes inventive, patience, a burnt drill, sore hands and a cut finger...

So, to fix this:
https://www.rx7club.com/attachment.p...1&d=1285482220

I used this:
https://www.rx7club.com/attachment.p...1&d=1285482220

and this:
https://www.rx7club.com/attachment.p...1&d=1285482220

First, I cut the inner bucket of the trash can so the air filter fits in and then cut two holes for the hoses that will route the fresh air to the filter. I made a template for the cold air bucket lid to enclose the filter in it...
https://www.rx7club.com/attachment.p...1&d=1285483109

I made another template to surround the plastic bucket with the metal of the trash can. Those templates were used to build the lid and the "metal heat shield" and here the results...
https://www.rx7club.com/attachment.p...1&d=1285483757
https://www.rx7club.com/attachment.p...1&d=1285483757

The original idea was to make two "little" holes in the inner fender to get fresh air to the filter, but my drill died on me just after finishing the first hole, so I ended making only one hole in the fender and routing the second hose the the front, near the gap between the hood and the passenger headlight...

This the first test fit. Note that the heat shield is not installed yet...
https://www.rx7club.com/attachment.p...1&d=1285484443

And two angles of the finished product...
https://www.rx7club.com/attachment.p...1&d=1285484443

https://www.rx7club.com/attachment.p...1&d=1285484443

I am thinking of putting some kind of Mazda decal on it... so it can look more "factory" :nod:

What do you think people?

That's.... FUCKING.... AWESOME!

EPIC WIN! (Says my fiance)

That get major kudos for inventiveness, man...

All except for the 'holes in the fender' bit... But since you meant the inner one, it's okay.

One question, though: Why's the radiator hose pointing UP? Wouldn't the be jammed into the underside of the hood?

Okay. I know that was TWO Questions, but WTFE.

AWESOME! Make me one, for my turbo inlet pipe! Mazda decals! Awesomeness!

Hmm... Group Buy!

Gigetty.

Radiator elbow
 

Thanks man... it turned all just like I imagined (except for the second hose)... I´m very happy with the results...

I though "inner fender" was a real term hehe... remember I´m from a Spanish-spoken country, not a native English person... (Costa Rica... wow! :))

About the radiator hose, well I don´t know if turbos have the same elbow, but my stock radiator has an 90 degree elbow that points the hose down. Refer to the picture... and no, it doesn't hit anything...

Besides my drill and my finger, other not-so-positive collateral effects of this DIY build was that I hit the windshield washer reservoir with the drill and I have a leak on it now... It's on the top of it so I'm essentially losing the reservoir neck capacity only... not a big deal...

Now I think I have to retune a little my EManage because it's leaning a little... it means my trash-can-CAI is working :ylsuper:

And other thing, doing the math, the cost (not including loses) was:
- Trash can = 10$ (aprox)
- Pizza Tray = 1.5$ (aprox)
- Rad hose = 10$ (aprox)
Total = 22$ aprox

Not bad!! :lol:

I meant the radiator hose, coming out of your intake trashcan... First post, pic all the way to the left.

My fiance is Costa Rican. Her father still lives there, in San Jose and we're actually supposed to be coming down there for Christmas, to see him.

She told me to ask how many people there have RX7s.

looks pretty good, especially considering the oddball materials!

LOL, that's not too bad. For optimal airflow the can should have been a bit bigger, and the inlet hoses are a bit small, but I it looks like you did the best you could with the stock AFM and the space that you had to work with. Kinda funny how your CAI is better than most of the commercial models on the market.

I think you should put a well-known tuner decal on it just to mess with the ricers, or even make up your own name.

A CAI will not affect AFR on a car with a properly-functioning AFM. If your EManage leaned out, then there is probably something wrong with your fuel system or sensors. You may also want to check to see if there is a leak in the intake tract from fiddling around with it, as this could also cause a lean condition.

+1 on the self-promotion decal.... Maybe use 'Cern' and make it with a cool font and work the 'e' into a rotor....

Hm... I d have to look at that... I may post something later on :suspect:

Just out of curiosity, isn't CERN the Nuclear research organization in Europe? > Maybe These Guys?

Please put an Oscar the Grouch sticker on there. Trash-can intake! That is the mark of a true bad-ass!

Now THAT is a good idea.

Firing up Photoshop, now...

Here ya go. Fresh off the dbA: Gear.Head.Designs press.... Oscar the motherfuckin Grouch....

http://www.utistunts.com/DbA/S5%20Ti...otoryOscar.png


Anyone think a quotation is in order?

More awesome. I'm liking this section alot lately.

Innovation is AWESOME!

TrboSpdAnt: That is so awesome! LOL! Good job!

I'm not the cursing type, but I'd be tempted to put "Scram piston biatch" or something along those lines.... rofl. But it's strong enough to stand on it's own for sure.

:rlaugh: :crackup: :score:

yea, it will be fresh air but your inlet hoses are too small which will rob the power that was to be gained, it may even be less efficient than the hot air intake.

Thank you, thank you.

:worship:

Quotation.... I like the "Scram, Piston BEEOTCH!" idea... I agree that it should be something OTG would say.

As far as the leaning bit,That means that it's acting line a ram-air and actually forcing air into the inlet... The Pontiac GTP had a HORRIBLE problem of that. At about 80mph it would lean down to JUST BARELY hazardous levels, under heavy throttle.

Anyone else want something done, graphically, let me know. It's what I do. :egrin:

awesome

Hmmmm interesting that leaning out... its just a little bit but I´ll investigate some vac leaks... And in fact it's feeling a little restricted up top... but a lot torquier down low...

I am thinking of opening the front and put another snorkel there, going to the front like the side hose... TrboSpdAnt, that hose has sufficient space to not be jammed by the hood and hopefully its drawing air from the gap between the hood and the headlight lid.

I don´t know what CERN is hehe... but my nickname is cerM78 with an M :) Those are my name initials (Carlos Esteban Ruiz Montoya) and my birth year...

There are not much RX7s here in Costa Rica... I don´t know exactly but there may be less than a hundred sevens, including all generations from 1st to 3rd... My vert is the only I've seen but there is the rumor that there are other two...

Mine needs some TLC, soft top is torn, paint is a little faded, front bumper and left fender need to be fixed (impossible to find a S5 bumper...) but I love my gas guzzler :lol:

I'll be thinking how to improve airflow without turning the project into a Getto-Trash-can-CAI...

regards!

PD: May be I'll be printing Oscar too :)

Awesome, brother! Let me know if the printers have a problem with the detail and I need to adjust the resolution... My suggestion - as I always suggest when designing things for stickers or vinyl, on cars, is to have it PRINTED on the vinyl... Not just a stack-cut, regular.

'Course, you could use a static sticker (thin plastic sticker), but you'd better NEVER want to remove it. :evilgrin:

Best snorkel total diameter?
 

One question to the experts:

Which is the best total area for the filter trash-can (box) breathing snorkels?

Right now, there are two 2inch inner diameter hoses, so there is a total area of 6.284 inch, which is equivalent to a 2.829 diameter hose (almost 3 inches)

I don't want to drill a bigger hole in my car :) but I can enlarge the side hose or build another front snorkel, but what is the recommended total area I should be looking for?

The stock AFM doesn't seem to have more than 3 inch diameter (don't know for sure) so what is the advantage of having more input area to the filter if the intake itself will have it's own restrictions?

Thanks!!

custom intake FTW!!!

You are correct about the diameter restriction, in the AFM, but there's a difference between the volumes and pressures, regarding.

You can have a 10psi flow in a 1" pipe, which, under the same volumetric flow, double to 20psi, in a .5" pipe.

If the flow is not the same, then the pressure will actually diminish; ergo the air supply will, as well.

I think as long as your FLOWRATE (however much air is actually flowing through the AFM is the same, you'll be fine. But you're also talking about a reading across about 8000rpms.... Volume changes dependent upon the amount of vacuum draw, through the intake (not VACUUM, like inside the engine, but suction).

As long as the air can flow as easily as it does through the stock intake, to the AFM, all good as gravy.

I think you ought to look and see how much room you've got to work with, in expanding that hole you've already got.

Of course.... You could just remove your FTP lenses to remedy any possible cool-air access problems ;)

Mine FTP are already removed :)

I'll see how much can I enlarge the breathing area... Thanks!

AH. I was looking at your avatar. Thought they were still in place.

The trash can CAI does not have any significant ram air supercharging effect, and most likely it has zero. A true ram air scoop is of a divergent duct design, which does not very well resemble the trash can CAI.
http://www.answers.com/topic/divergent-duct

Let's look at the simplified formula for ram air pressure rise:
PSI = (mph)^2 * 0.0000176
PSI = (80mph)^2 * 0.0000176
PSI = 0.11264

Therefore, assuming the Pontiac GTP has a 100% efficient design (which it doesn't), and assuming it has a 100% efficient intercooler to counteract the ram air temperature rise (which it doesn't), the gain at 80mph would be 0.11264 psi, which would equate to about 0.9% increase in power. If that small amount causes the engine to lean to just barely hazardous levels, then that car is truly one steamy pile of crap. Be sure to tell that to the person who lied to you about that car. ;)