alright to start out im building my own cold air intake. I think this is the cheapest and also I can build it custom. Ive already built the "flange" that is a almost perfect match to the intake manifold. Now im trying to decide if I should go with 2.5" piping or 3"? Which would allow more intake flow and give me more gains. Also where could I run the cold air intake for "maximum coldness"

any info helps
thanks

 

maybe you should do some searching... there are TONS of threads on this..


now, i will help becuase i just got done doing the samething myself...

I took my intake straight off the TB and right behind the strut towwer using 3inch pipe with adapters for the MAF... I made my own custom hood scoop that feeds right in to the filter and it seems to be a good setup... i have not driven the car yet beuase it is in my shop right now... i sprayed primer today and will sand and lay down the enamel tomorrow!!! woot! almost done!

anyways, i will let you know what i see from this setup...

 

pics?

 

i will take some tomorrow for ya

 

Sweet, thanks

 

alright so you decided to do a 3" pipe. Thats actually what I was thinking...mostly because right now I have a 3" pipe (from my exhaust) in the back of my car. What I was wondering is it lined up to the TB great...or if it was too big or too small.

did you have someone bend your pipe with a pipe bender...or did you get it manderally bent?

and i would like to see pics of this too....ill try searching for it also...mostly if I search cold air intake I get nothing

 

2.5 or w/e you feel like. Any bends you like for that matter. I calculated this before in another thread, fluid dynamics equations and all. The pipe is the last restriction you need to worry about. The places that choke the flow and the filter are a hundred times more important.

And you gotta make sure the air is actually cold, of course, by sealing off any warm air that might come in from under the hood of course. Any good seal should work well. I've seen people use an open top box with flexible rubber on top to make a good seal against the hood. Others pipe it all the way to the bottom, but then you gotta worry about water from puddles splashing & what not. I'd do it the first way and make sure you have a tube leading all the way to the outside air, with everything else sealed nearly air-tight. The stock snorkel does on okay job of this, but I'm sure that'd make your ricer buddies cringe, so find your own way.

 

alright well I was going to look into this step after I had built the actual exhaust. Is there anywhere I can see pics...because Ive only found a handfull of pictures of cold air intake....

 

Here is something I just threw together last fall...





Brian

 

i forgot the camera yesterday, so i will take some today

 

rx7tuner that is pretty bad ***...that gives me a better idea of what to do....cant wait to see more ideas...

 

In my 87 i built a cold air box a had the head light inlet u can buy almost anywhere thats the best way because the way rx7tuner did it u lose the cooling of the right brakes and i think thats more important but mine is more for track.

 

My CAI cost me just over $170 in parts.

Here is a pic.




Here is the thread. I had a different name at the time.
https://www.rx7club.com/showthread.p...ht=finished+my

 

I agree that the brake ducting is important. If you look closely at my pic you will see I left a gap for airflow to the brake that are the exact same specifications as the stock setup. The downside to my system is the removal of the windshield washer fluid resovior. That could be a pain or even dangerous for some people. I only drive my car on sunny days and wash it weekly, so it has not been a problem for me.

Brian

 

so what do you do when it rains?

 

so out of all these ways which is the coldest??? because im really taking my time on this project and trying to find te best way to do it...im "sandrel" bendin my pipe tommorow so that should take care of the upper angle...

 

alot of ppl do either what a-cups847 did or they run next to the bumper. but it sitting next to the bumper if you get hit there it could get smash. not to mention it could soak up water way easier.

 

oh no i didnt do this, i quoted it, i was wondering what he does in the rain, hydro lock cant be good.

 

Any method that intakes 99% outside air and no air from under your hood should be as cold as you can get.

 

As I stated earlier, I don't drive it in the rain. But there is such an insignificant amount of water that could get up through the pipe and into the engine, it isn't relavent. It is also virtually impossible to hydrolock a rotary.

 

^^ beat me to it. You do know that guys routinely run water through the vacuum line on the UIM to clean out carbon, right? No way enough water could get in to hydro lock, unless you are a u-boat commander.

 

You do realize that the intake air from a true CAI will only be as cool as ambiant right? So if its 110*F outside, the air it sucks in will be around the temp no matter where its placed or how its made.

 

^^^ maybe a short ram air insted of cold air would be better??

haha oh sorry, i dont know how i missed it, i just saw the pic and figured that youd be screwd in the event your out and it started **** pouring.


and no i didnt know about the water thru the vacuum lines, but then again im not really THAT good with cars mechanicly. i had my stepdads shop handle all that stuff. but i also didnt know rotarys dont hydro lock. just thought thats part of any engine. had a friend try that with his accord and he was out drivin and it started raing really bad. the car drove home but wouldnt start the next morning. he just sold it as was, still got about 4gs for it tho.

 

ah man, that idea is sex. ima try and do that

 

ill take pictures tommorow...
what if i replaced the relief silencer out and put the cai there?