4" intake on 3rd gen 3sgte, disscussion topic! GIVE YOUR 2 CENTS! Options

[presure2]

hey guys, as you know, jim now has the 3rd gen 3s in his car, and after doing some research around various boards, he decided he wanted to try a 4" intake.

now, before you all go nuts, the guys down @ hux racing in florida claim HUGE gains with a 4" over a 3" intake, and have posted some results.

here are a couple "copy paste" deals from mr2.com:

We always figured my street car made at least 280 rwhp. Until we dynoed it on our new Dynojet. The only mods are: our air intake mod 4", Blitz SBC boost controller, our 3" single tip exhaust, & boost cut defeated.

328 rwhp & 316 rwt

This is on a maxed out ct20b, stock ecu, stock injectors, genIII fuel pump, & stock intercooler. This was attained using 100 octane.

heres the dyno sheet:

The GenIII swaps we do I always push them to use our air intake mod since we have seen consistent results using that combo (4" K& N air filter, 4" inlet tube, custom coolant relocator hose).

so, with that in mind, (and the fact that hux racing wants 400$ for somthing they wont even show you a picture of) we decided to give it a shot.

since the inlet of the '20b is only 2.75" (yes, i know its a mm mesurement, but for all intents we all use a 2.75" reducer anyway..lol) we had to find a way to reduce the 4" pipe down to that.

since we couldnt find anyone who makes a 4" to 2.75" reducer, and the fact that i thought it would be kinda flimsy, if we could find one, i headed over to burns stainless to see what they had.

they carry 2 diffrent styles of "trumpets" (reducers) a longer style, and a shorter. so we got the 4" to 3" trumpet, and because of the limited room we have to work with, we chose the shorter style.
heres a pic of what it looks like, with the coke can for size reference.




once i got that in, and the coupler to mate the pipe to the turbo, i went out to the garage, and cut the pipe to set it up:



thats the basic idea, i just need to weld a couple bungs for the IAC and catch can, and weld it up.

im hoping we can get back to back dynos at some point real soon with a 3" intake vs this one, the only thing i need is a 4" k&n, or a 3" ebay special so the tests will be the same with no variables.
if everything shakes down right, we could do this on both dustin, and jims cars, to get more results on diffrent cars, to see what kinda results we can truly get.


discuss!!

[pipes]

I tried it after being @ ur house sounds cool only problem I think is heat because its steel it absorbs all the heat so after awhile your sucking hot air.....from your picks your getting air from the factory spot? I found that leaving a headlight out to be effective as engine bay temps were cooler...I ended up returning to factory because I'm trying to escape heat me and my buddy fabbed up a cold box were gonna fit it on sat hopefully I'll let you know

This post has been edited by pipes: Nov 26, 2008 - 11:18 AM

[presure2]

I tried it after being @ ur house sounds cool only problem I think is heat because its steel it absorbs all the heat so after awhile your sucking hot air.....from your picks your getting air from the factory spot? I found that leaving a headlight out to be effective as engine bay temps were cooler...I ended up returning to factory because I'm trying to escape heat me and my buddy fabbed up a cold box were gonna fit it on sat hopefully I'll let you know

yea, aluminum would be a better choice for piping, but unfortunatly i dont have a tig welder (and dont know how to weld with it for that matter!) so this is pretty much what i can do for now.
we do have options as far as coatings ect to try and help with that, although to be honest, im not too worried about it, we've been using this style of intake on swaps and 5sftes with great results so far, and at SOME point down the road i really would like to get into a tig setup.
a cold box is a great idea, i need to start working on some ideas for somthing.

NP - glad to help. This also reinforces what I've said before about 2.5" intake piping vs 3" - this is just taking it one step further. What size IC piping would you suggest after this mod?

ohh i dont know on that, since this is a 3rd gen setup, with factory IC, there is no piping. lol

but i would imagine that guys doing somthing like this would be going big anyway, so i would guess 3" ic piping.
i think of course the gains would be better with a larger turbo ect. that would utilize the extra flow potential, especially those with a larger turbo inlet.