cold air intake box or extension out of bay?
 

so my cold air intake is in the engine bay, and i either want to build a box around it to keep the hot air out of it (if its that effective) or buy a coupling, and some pipe and extend it out of the engine bay?

i actuly started a thread about this earlier in the year heres the link. hope it helps, im still making the molds to get the fit right
http://www.toyota-supra.info/forums/...e-air-box.html

basickly you could make a hose going from the stock snorkle hole to the bumper to get freash air,the way i would do it is to remove the pasanger side fog light make a velocity stack and run a pipe up to the snorkle hole which is followed by the box which keeps the hot air out i would make the box that houses the filter element out of fiberglass since it doesent heat up like aluminum does ( race cars use it because there always moving air never standing still like a daily would) if you get aluiminum pipes wrap them in exshaust wrap to keep the pipes cooler

hmmmm that does sound pretty good, hmmm...wat about extending a pipe off the afm, and putting the cold air intake by the bumper?

This is covered in the FAQ's. Box vs 'out of bay'... Stock is better than an open filter in the engine bay though.

what cre said,



but i would think that if you put the filter at the bumper rain, debris, speed bumps, sand/mud and alot of other stuff would come into contact whith you filter and that would need constant replacments. unless you fabed a shild of some sort

this is what i initaly thought, correct me if im wrong

There are devices you can install is you're planning on driving through flooded areas (which I advise against no matter where your air filter is located). This too is mentioned in the FAQ thread if I remember correctly... I know I've posted data on it a couple times now.

As for debris and mud and such... The idea for most is KEEP the fog light in place. If you remove the fog light it should be obvious that more frequent servicing/cleaning will be needed on the outward facing portion... remember, the rear should stay relatively clean and free breathing.

well i think im just gonna build a wall around it, or atleast a wall to prevent the hot air from the radiator fan from getting to it

FYI - Extending it is the easiest and usually most effective method.... Piece of pipe and a silicone coupler. It's harder to service the air filter though, but given that that's not something you ave to worry about all the time it's hardly worth mentioning.

how far would i really have to extend it tho? I haven't been able to look under the car because its been raining literally all day but just curious if there is really THAT much more air that it will get, and yea wat about water and such?

It's not a matter of either one getting more air.... Actually the stock air box flows as much as any 3" piping and big cone filter will and it gets its air from forward of the firewall. The issue with the stock air box is just idiots using cheap ass filters which flow less than a coffee filter. The stock filter has a LOT of surface area and actually requires the air to change direction less than a cone filter.

The pipe to run under the headlight is L shaped with about 12" on one end and 6" on the other. Put some thick rubber along the edge of the firewall's oval opening so it doesn't cut into the pipe.

Rain won't affect it at all... less so if you have your fog lights in place (echo... echo...). As for driving through flooded areas deeper than the height of your fog lights... well, you've got bigger problems. As I said, there are ways to ensure that you don't suck up a bunch of water should you try to go canoeing anyway. They should be covered in the FAQ thread. One is a small conical filter which sits between two pipes like a coupler. It's restrictive enough that it doesn't pull in air unless the filter is blocked. The other is a spring loaded relief valve. At any rate the filter should sit behind the bumper between the fog light and head light so it'll see almost no moisture. Be sure to install this while the head light is DOWN!

The upside to moving the filter forward of the firewall is that you don't have work to ensure the box seals off from the engine bay when the hood is closed or has its own lid to bolt on. Another downside to a box is there's a greater volume of air to heat soak at idle and low speeds (same goes for running larger IC piping than you need ;) ). In all cases it's a good idea to get all intake and exhaust piping ceramic coated.