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Old 07-30-2003, 10:50 PM   #1
IggDawg
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Default IggBore v3.0 DIY intake

I did a new DIY intake tonight. just for kicks. my old one had too much duct tape on it. this one is very similar to an injen intake or the like. It consists of one 90* ABS elbow (the "plack PVC" at home depot) and the tube from a civic short ram intake available at any autozone for 30-ish bucks. IT uses the stock airbox from a 2.2L engine. why, you ask? the stock 2.2L airbox as a very good straight-through flow design, whereas in teh top mount 2.5 airbox the air has to take a 90* turn through a filter. not good for velocity. also, the 2.2L box has a 3" opening on both sides of the filter. I have a small velocity stack going from the box into the fenderwell.

top end is nice, low end isn't appreciably boggy. oddly enough, top gear cruising throttle response is better. like 60 mph in top gear, the response feels better than stock. I'll have pics tomorrow. jsut wanted to mention all this.

-IggDawg
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Old 07-31-2003, 01:36 AM   #2
JewPac42
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How big is the pipe? That sounds like what used to be on my car before I got the COBB.
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Old 07-31-2003, 01:58 AM   #3
kami333
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yeah for the Iggybore! Definately have to check out the pics
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Old 07-31-2003, 04:40 AM   #4
8Complex

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TTIWWOP!!!

Oh wait... this isn't OT....
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Old 07-31-2003, 09:25 AM   #5
IggDawg
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here are t3h pics!







so there it is. pipes are 3 inches all the way to the TB except for the "accordion section." I needed something to connect the pipes to the airbox with so I chopped out a piece from another 2.2l intake I had sitting around. ideally that piece would be another 3 inch ABS pipe.

you can see the little tube in the last pic the little pipe that goes from the box into the fender. this is important to install or else you'll be pulling in air from teh fender, AND ari from around the sides of the box. not only will this be giving you warmer air, but the two streams will meet just before the box and cause turbulence.

so there she is in a nutshell. much like an injen or an AEM intake that feeds from teh fender instead of the engine bay. also, I think it's a little wider.

-IggDawg

PS - check out the snazzy strut top hat covers. while you're in the junkyard getting this or that, look at the older legacies. some of them have those and I think they look nice on Imprezas.
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Old 07-31-2003, 11:27 AM   #6
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The black tape is a nice touch

I take it that the Civic tube is 3"?
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Old 07-31-2003, 11:38 AM   #7
IggDawg
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I reckon. and yeah, the black tape adds powAr. when I get the final tubes I want on it I'll silicone everything up. I want to change out the black elbow for one with a different fitting so I can use a proper rubber coupling hose. right now it's jimmy-funded with whatever short rubber tube I found lying around the garage. so when I replace that and the accordion pipe I'l seal it up all nice like.

-IggDawg
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Old 07-31-2003, 11:41 AM   #8
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A homemade COBB! Any low end losses?
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Old 07-31-2003, 12:15 PM   #9
IggDawg
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Quote:
Originally posted by JewPac42
A homemade COBB! Any low end losses?
high praise . not appreciably. if the engine is idling and I blip the throttly, it bogs momentarily, but as long as the revs are above 1 grand, she doesn't seem boggy at all. also, there's still a restriction in the system I need to work out. that stupid accordion pipe pinches down to 2.5" at its outlet, so aside from creating a bafling effect and pinching airflow, it creates turbulence as it opens to 3" . I'm confident when I replace that pipe it'll eb a lot better.

I tried it for the first time on the highway today, and the butt dyno approves.

-IggDawg
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Old 07-31-2003, 02:47 PM   #10
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Quote:
Originally posted by IggDawg


high praise . not appreciably. if the engine is idling and I blip the throttly, it bogs momentarily, but as long as the revs are above 1 grand, she doesn't seem boggy at all. also, there's still a restriction in the system I need to work out. that stupid accordion pipe pinches down to 2.5" at its outlet, so aside from creating a bafling effect and pinching airflow, it creates turbulence as it opens to 3" . I'm confident when I replace that pipe it'll eb a lot better.

I tried it for the first time on the highway today, and the butt dyno approves.

-IggDawg
Home Depot can solve that for less then 5 bucks. I imagine it will improve greatly with a larger pipe.
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Old 07-31-2003, 03:11 PM   #11
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What about sound? Is it pretty loud?

jp
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Old 07-31-2003, 03:18 PM   #12
IggDawg
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It's not too loud till around 4500+ RPMs where it gives this wonderful metal-mechanical scream . I'm sure teh baffled section of pipe cuts down on sound, yet another reason to reaplace it ASAP

-IggDawg
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Old 07-31-2003, 04:23 PM   #13
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Are you gonna be at the east coast subaru shootout? If so we can test it against my COBB there.
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Old 07-31-2003, 04:26 PM   #14
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Quote:
Originally posted by JewPac42
Are you gonna be at the east coast subaru shootout? If so we can test it against my COBB there.
like that's a fair fight . I've got a slushbox and 300 lbs on you. GDA = fastAr than GC8 . My car is quick and fun in the twisties, but not so fast in a straight line.



-IggDawg
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Old 07-31-2003, 04:39 PM   #15
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Quote:
Originally posted by IggDawg


like that's a fair fight . I've got a slushbox and 300 lbs on you. GDA = fastAr than GC8 . My car is quick and fun in the twisties, but not so fast in a straight line.



-IggDawg
I meant in your car, to see how good of a job you did in replicating the design. Obviously I would smoke you if we raced. 15.5>17.5
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Old 07-31-2003, 05:43 PM   #16
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Sweet, you guys are going as well? I'll be up there with a few people... unsure whether my car will be going/be raced this year or not though.
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Old 07-31-2003, 06:30 PM   #17
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Quote:
Originally posted by 8Complex
Sweet, you guys are going as well? I'll be up there with a few people... unsure whether my car will be going/be raced this year or not though.
Yah, Ill be there with my 15.5 sec beast! But I dont have a place to stay or money for a hotel. Hopefully I wont have to sleep in my car.
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Old 07-31-2003, 07:38 PM   #18
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Last year I went in on a room with 3 people and I think each of us spent $30 a piece for both nights. IIRC, we were staying at the Comfort Inn and we'll probably be staying there again. Take a look at the planning thread in PPB... RiftsWRX handled our reservations last year and may be doing it again this year.
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Old 08-18-2003, 03:27 PM   #19
IggDawg
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Update:

I replaced that restrictive section with a piece of 3-inch tubing (made from a 1-litre coke bottle and duct tape ). so now it's 3 inches uniformly from the fender-mount airbox to the TB. It helped. noticably. the whole system is working wonderfully now. I know where my top end was hiding all these years . it works really nicely. I have a pretty well tuned butt dyno, and I can certainly tell it's better than stock. the low end is amazingly responsive. when I putt around parking lots, a little blip of hte throttle sends the wife's head into the headrest . I had to relearn her in some respects. she really wakes up around 4500 now too, where she used to just kinda continue accelerating at a moderate pace. definitely worth the 10 dollars in parts. it feels superior to the hommade ganzflow I had for sure.

-IggDawg
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Old 08-18-2003, 04:25 PM   #20
DrBoy01
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Wow, I didn't know that the 90* bend in the stock intake was that restrictive.

Guess who's going to ask for a Cobb for his birthday
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Old 08-18-2003, 06:28 PM   #21
IggDawg
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Quote:
Originally posted by DrBoy01
Wow, I didn't know that the 90* bend in the stock intake was that restrictive.
it's not only that, but the air has to make another 90* turn into the TB while going though the filer element. on top of that, the way the filter element pleats are sitting relative to airflow, turbulence is generated at teh tips of the pleats since the air is crossing them at a decently shallow angle. the 2.2L design is superior IMO becuase the air is traveling pretty much in a straight line through the filter element. all the turns are done through bare pipe. that's what prompted me to do all this. using that airbox combined with big bore pipes seems to work out real well.

-IggDawg
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Old 08-20-2003, 12:14 PM   #22
bongchild
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Thumbs up cool!

PICS POR FAVOR! I just may do this myself..... Does it translate directly over to a 93 L, or is there other stuff to take into consideration?
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Old 08-20-2003, 12:23 PM   #23
IggDawg
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the TB might be narrower, but other than that it should be fine. all that trouble I had with that restrictive section (later replaced by a coke bottle) would be a moot point for you. your MAF would fit that area perfectly. I'll take some more pics later today.

just for the record, you hae a 1.8l right?

-IggDawg
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Old 08-20-2003, 03:01 PM   #24
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Quote:
Originally posted by IggDawg

just for the record, you hae a 1.8l right?

Yep. Sure do. Would a wider TB help at all?
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Old 08-20-2003, 03:50 PM   #25
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Upload the finished one, I want to see the coke bottle! Can you read the lettering on the bottle? You should send in a pic to Coca Cola, you might get a sponsorship
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