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!!

[RUNNIN-LOW]

k..knowing that running 20psi with stock computer and everything, the car should be doing about 290 to 300 to the wheel on race gas. not sure what the true max of the ct20b is but lets say its 22psi, a intake should only (if it works right) put about 5-12 gain in horse (<----after stock intake), correct me if im wrong but im not totally sure about the horse gain is. but i cant see at 20psi(is stock ct20b max) making a 40-50hp gain with just a 4inch intake??? but sayin at at 22psi you make 305-315hp then u add the 4inch intake and make 328 to 316 then thats is believeable.
so what im getting to is that with a 4inch intake you can make a reliable 40-50 hp gain damn!!, but yeah testing it would be great.
i myself was planning on making a 4inch icebox and see what the differents is.

ok here is a crazy story..my buddy with his 92 civic with a swap b18c use to have a injen cold air intake right..he went and got it dyno at 218 to the wheel. after it got stolen he decided to make his own as a joke untill he got a replacement. so he went and got 4inch pvc pipe and fab his own up. decided to go to the dyno for fun since we all was going to get our dyno and amazing things was that when he went and dyno he made more power with the pvc intake then the injen one..228hp

so it could happen but im not sure if u can really get 40-50 horse gain...

This post has been edited by RUNNIN-LOW: Nov 26, 2008 - 11:53 AM

[_Jim_]

k..knowing that running 20psi with stock computer and everything, the car should be doing about 290 to 300 to the wheel on race gas. not sure what the true max of the ct20b is but lets say its 22psi, a intake should only (if it works right) put about 5-12 gain in horse (<----after stock intake), correct me if im wrong but im not totally sure about the horse gain is. but i cant see at 20psi(is stock ct20b max) making a 40-50hp gain with just a 4inch intake??? but sayin at at 22psi you make 305-315hp then u add the 4inch intake and make 328 to 316 then thats is believeable.
so what im getting to is that with a 4inch intake you can make a reliable 40-50 hp gain damn!!, but yeah testing it would be great.
i myself was planning on making a 4inch icebox and see what the differents is.

ok here is a crazy story..my buddy with his 92 civic with a swap b18c use to have a injen cold air intake right..he went and got it dyno at 218 to the wheel. after it got stolen he decided to make his own as a joke untill he got a replacement. so he went and got 4inch pvc pipe and fab his own up. decided to go to the dyno for fun since we all was going to get our dyno and amazing things was that when he went and dyno he made more power with the pvc intake then the injen one..228hp

so it could happen but im not sure if u can really get 40-50 horse gain...

I dont really understand why you keep saying 40-50whp gains with no additions other than a 4" intake. You seem to clear it up again when you guess at HP levels at 22psi without a 4" intake being 315, and when the 4" intake is added you quote the actual numbers made of 328. Meaning at this point in time the only difference being the actual 4" intake (still 22 psi) and not different boost pressures. so the intake made an additional 13whp with the number you posted.

As far as the "max" the CT20B can produce, nobody knows yet. Hux recently modded the wastegate actuator on a customers car and hit 30+ psi at 4000rpms where he had to (QUICKLY LOLOLOL) stop the run, it should be interesting to see what PSI he plans to run when he sorts out the wastegate actuator.

And you said 290-300whp at 20psi on race gas.....why? I plan on running 20psi on 93 pump gas, and water injecion. Do you say race gas because you dynoed your car on race gas and this is just the information you know from first hand experience?

And while we are on the topic of race gas and power, I may have some info mistaken. From what I have read race gas in a Great tool for experimenting with higher boost levels. This is because it burns slower and cooler than 93, and chances of knock are less likely to occur. I know you are able to achieve higher boost levels than with regular 93, but I don't know if there is much of a change in spool because I haven't seen a dyno run just to see the different characteristics race gas has on a car, with all other mods being the same. But as for added HP, and this where I could be wrong, I dont think there are HP gains to be had just by running race gas. I have heard +10 whp....but again I have only heard of that, never seen any actual info showing me that. Now, I am not saying you CANT get more horsepower out of race gas on the same setup, but you need to tune for it. You can run race gas much leaner than you can 93....safe afr's seem to range 12-5-13.0 where as pump gas safe afrs seem to be aimed at 11.5. So there are quite a few gains to be had there. I know that was a little off topic, but maybe I can tie it in here. If boosted achieved 290-300whp at 20psi on race gas untuned stock GE3 ecu, then I would expect 290-300whp at 20psi on pump gas untuned stock GEN3 ecu and WI (I wouldn't feel to good running these boost pressures without WI, this is why I stated that)