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Cold Air Intake, Searched, But Cant Find Answer

nsta

By nsta,
in Engines & Forced Induction

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nsta Mentor

nsta

Posted
Posted (edited)

Hey guys, just been searching the last 30mins on cold air intakes for r33's. But i still dnt know what sort of bends i should use for the piping.

I have a fmic now so i can use the std hole, does this hole need to be enlarged or will the size (2.5"?) suffice???I have a type m front so i can use the hole in the corner of the bar as my feed.

Should i get one 90degree bend in the middle, or would straight - 45 - straight do a better job?

Im thinking of using flexi-tube or pvc, do you goes mesh the piping? so big things cant go through or is this not worth the hassle/cost?

pic below, lol done it in 2mins so bear with me hahah

post-6529-1140046933.jpg

Edited by nsta
Beeble Community Regular

Beeble

Posted
Posted

I used the same hole saw i used for the FMIC piping install to make it a bit bigger, and then drilled another hole right next to it, so there's about a 3" by 5" hole. did taht make sense?

I've seen a lot of pvc pipe used.

I don't use any pipe at all - it's still sucking cold air from outside the engine bay, as long as you have a sealed box setup. i just didn't see the point of an "air ram" when you're already running a compressor after the filter anyways...

Beeble Community Regular

Beeble

Posted
Posted (edited)

look here

and here

Nsta - i don't just use a heat shield, i have the pod in a sealed box, the only opening is the large hole at the bottom.

As that hole is the only way for air to get in to the box, i don't see why you need a pipe to help it get there? the stuff is generally fairly good with finding directions :)

That said, lots of guys use pipe.

I figured that the air below the airbox (just under the hole) is under pressure anyway - if you're moving forward, air comes through the front bar and hits the plastic guard that sits on front of the tyre (the grill that stops mud etc getting on the back of your old side mount intercooler).

So the air would head into the airbox with the sucking filter, as it's the path of least resistance.

standard hole is about 2-2.5" diameter. Might be a bit small and cause a restriction? i don't know - someone must study flow dynamics on here!!??

Edited by Beeble

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