Intake mod

WrcSpeed · 07-27-2003, 11:08 AM

Hi I wanted to modify the stock intake to make it a bit better until I can muster up the cash for a cobb.

I have 4 pictures in the photo album below.
http://public.fotki.com/WrcSpeed/subaru_intake/

Can anybody tell me what the big round container(pic 3) is for and the other angled small one also(pic 4)?

I suspect just for water ingestion protection, but 3 different containers for water (long one also pic 4) ??? Can any of these be removed and plugged up?

Basically I want to make the intake like a PDM-racing style and give it more flow.

Thanks!

* Registered users of the site do not see these ads.

HondaH8er · 07-27-2003, 12:35 PM

Those containers are more for resonance than anything else. in other words, they tune out a lot of the intake sound for a quiter engine. Should be no problem at all to remove or block them off, as I'm sure you've noticed that all the aftermarket intakes have nothng like that on them. My GanzFlow is just a tube from the fender to the airbox, are is the Cobb and PDM. You might be better off waiting and getting an aftermarket intake, though, instead of modifying your stock intake, just in case you ever need to put the stock intake back on. That's what I did, and it's a good thing, too, as I have to run my Rally-X's in Open class with the Ganz intake, but Production GT with the stock intake. Definitely glad I kept the stock tubing!

WrcSpeed · 07-27-2003, 01:45 PM

Well the big container just clips on and off. but the smaller one has some sort of rivet on it.

I will probably just block off the big one and see the effect. I'll do something temporary that holds on with tie-wraps or something.

WrcSpeed · 07-27-2003, 08:56 PM

Removed the big container that is linked to the intake and plugged it. I went for a couple of accels and i can definitely see a difference, there's a little growl that was not there before.

For what it takes in time it's worth it. Can't say if it made a improvement performance but it sounds faster

Imprezive2002 · 07-28-2003, 03:25 PM

this is the one im selling gives more performance and sounds real nice i ended up buyin a more expensive one throw me an offer its still pretty new only used for a month take a look and get back to me thanks Nick

http://www.digitoma.com/aem.jpg

Madchill@optonline.net

WrcSpeed · 07-28-2003, 06:13 PM

Thanks but i'm saving up for a better one as well.

Subasaurus Rex · 07-28-2003, 10:01 PM

I've experimented a little with this myself. So far, it seems that the best thing to do is just remove the big 'box', and leave the rest. Taking more away tends to make the engine lose bottom-end because of too much air getting in. Remember that N/A engines like to be 'tuned', or have a certain balance in regard to intake/exhaust flow.

Anyway..... I felt that removing the big box smoothed out the mid to upper end, while retaining the low end. Gives a nice growl at WOT also. Gas mileage didn't seem to be effected much either - still get 26-28mpg.

Plus, it's a 'free' mod!

WrcSpeed · 07-28-2003, 11:25 PM

Free is good

Just curious, what did you use to block the hole left by the big container?

Subasaurus Rex · 07-29-2003, 11:16 AM

Didn't cover the hole with anything. Lets more air in that way.

hunts · 09-18-2003, 04:40 PM

Subasaurus Rex: I took the "big box" but had it plugged up. Definitely a little bit noisier than stock at WOT. I was wondering if you had any problems with yours since you didn't plug up the hole, eg. water ingestion?

We're gonna get hit with what's left of Hurricane Isabel tomorrow, so I don't think I'm going to experiment without my plug just yet. :P

impreza99obs · 09-18-2003, 05:07 PM

dump question, how do you take it off?? how many bolts??

dpjef · 09-20-2003, 08:07 PM

I regularly get email from MRT (mailinglist) and not long ago there was a section on removing the 'air intake silencer' and how it should improve performance. Bloody hell, if MRT says to take it out, then I'm taking it out!

WrcSpeed · 09-21-2003, 12:06 AM

2 bolts and that's it

Very easy cheap (0$) and you see the difference right away.

but I have a 2003 not sure how it is on a 99 like yours

Machine Age Victim · 09-21-2003, 12:32 AM

too much air is a bad thing?!? I modified mine myself. I'm using a panel filter that uses the front of the stock box and feeds from the hood scoop. That was the best way I saw to get as much air as possible. Still great low-end and strong all the way through. It also knocked 2 tenths off my 1/4 mile time

Machine Age Victim · 09-23-2003, 03:41 PM

no answers to my question?? maybe I'll post a new thread

BOY · 09-24-2003, 11:08 AM

Quote:

Originally posted by impreza99obs
dump question, how do you take it off?? how many bolts??

Is your OBS MAF or MAP (99 2.2's were 1/2 and 1/2)? If you've got a MAF you need to ignore this entire thread, if you've got a MAP the procedure should be identical... hope that helps.

Quote:

Originally posted by Machine Age Victim
too much air is a bad thing?!? I modified mine myself. I'm using a panel filter that uses the front of the stock box and feeds from the hood scoop. That was the best way I saw to get as much air as possible. Still great low-end and strong all the way through. It also knocked 2 tenths off my 1/4 mile time

MAP based Imprezas require the second airbox to compensate for large throttle angles at low RPM. The reason that MY00+ "prefer" Ganzflow/PDM style intakes over traditional J-tube "cais" is for this very reason. If you just take off the back of the box and attach the filter somehow you've done jack squat to improve the intake flow path, you're sucking hot air, and losing low end... the 2/10ths is likely due more to your driving than anything else (how did your 60' times compare).

Machine Age Victim · 09-24-2003, 04:50 PM

well, it is cold air (well as cold as the air could be after flowing across a dark painted hood in Florida) but it feed from the hood scoop.

my '60 times always stayed consistant around 1.8-1.9, with a reaction time of .580

So I've done nothing to improve the flow of air beacause it's still the same diameter on the MAF?

I also was thinking of putting the back on the box and cut the pipe out ( so there isn't a turn in it) and having the pipe curver around to feed from the hood scoop, maybe an angled opening into the pipe?

oh and how bad is the turbulence over the scoop?? does it get enough ait into it or would a huge, hood-length, NACA vent be better?

07-27-2003, 11:08 AM	#1
WrcSpeed Scooby Newbie Member#: 33840 Join Date: Mar 2003 Vehicle: 2003 Impreza TS Silver	Intake mod Hi I wanted to modify the stock intake to make it a bit better until I can muster up the cash for a cobb. I have 4 pictures in the photo album below. http://public.fotki.com/WrcSpeed/subaru_intake/ Can anybody tell me what the big round container(pic 3) is for and the other angled small one also(pic 4)? I suspect just for water ingestion protection, but 3 different containers for water (long one also pic 4) ??? Can any of these be removed and plugged up? Basically I want to make the intake like a PDM-racing style and give it more flow. Thanks! * Registered users of the site do not see these ads.

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07-27-2003, 12:35 PM	#2
HondaH8er Scooby Specialist Member#: 3097 Join Date: Nov 2000 Chapter/Region: NWIC Location: www.rs25.com Beaverton, OR Vehicle: 2000 2.5RS Coupe Silverthorn Metallic	Those containers are more for resonance than anything else. in other words, they tune out a lot of the intake sound for a quiter engine. Should be no problem at all to remove or block them off, as I'm sure you've noticed that all the aftermarket intakes have nothng like that on them. My GanzFlow is just a tube from the fender to the airbox, are is the Cobb and PDM. You might be better off waiting and getting an aftermarket intake, though, instead of modifying your stock intake, just in case you ever need to put the stock intake back on. That's what I did, and it's a good thing, too, as I have to run my Rally-X's in Open class with the Ganz intake, but Production GT with the stock intake. Definitely glad I kept the stock tubing!

07-27-2003, 01:45 PM	#3
WrcSpeed Scooby Newbie Member#: 33840 Join Date: Mar 2003 Vehicle: 2003 Impreza TS Silver	Well the big container just clips on and off. but the smaller one has some sort of rivet on it. I will probably just block off the big one and see the effect. I'll do something temporary that holds on with tie-wraps or something.

07-27-2003, 08:56 PM	#4
WrcSpeed Scooby Newbie Member#: 33840 Join Date: Mar 2003 Vehicle: 2003 Impreza TS Silver	Removed the big container that is linked to the intake and plugged it. I went for a couple of accels and i can definitely see a difference, there's a little growl that was not there before. For what it takes in time it's worth it. Can't say if it made a improvement performance but it sounds faster

07-28-2003, 03:25 PM	#5
Imprezive2002 Scooby Newbie Member#: 18872 Join Date: May 2002 Location: NY Vehicle: 2002 Impreza Aspen White	this is the one im selling gives more performance and sounds real nice i ended up buyin a more expensive one throw me an offer its still pretty new only used for a month take a look and get back to me thanks Nick http://www.digitoma.com/aem.jpg Madchill@optonline.net

07-28-2003, 06:13 PM	#6
WrcSpeed Scooby Newbie Member#: 33840 Join Date: Mar 2003 Vehicle: 2003 Impreza TS Silver	Thanks but i'm saving up for a better one as well.

07-28-2003, 10:01 PM	#7
Subasaurus Rex Scooby Newbie Member#: 5269 Join Date: Mar 2001 Location: Chippewa Falls,WI Vehicle: 1998 Forester L Black Diamond Pearl	I've experimented a little with this myself. So far, it seems that the best thing to do is just remove the big 'box', and leave the rest. Taking more away tends to make the engine lose bottom-end because of too much air getting in. Remember that N/A engines like to be 'tuned', or have a certain balance in regard to intake/exhaust flow. Anyway..... I felt that removing the big box smoothed out the mid to upper end, while retaining the low end. Gives a nice growl at WOT also. Gas mileage didn't seem to be effected much either - still get 26-28mpg. Plus, it's a 'free' mod!

07-28-2003, 11:25 PM	#8
WrcSpeed Scooby Newbie Member#: 33840 Join Date: Mar 2003 Vehicle: 2003 Impreza TS Silver	Free is good Just curious, what did you use to block the hole left by the big container?

07-29-2003, 11:16 AM	#9
Subasaurus Rex Scooby Newbie Member#: 5269 Join Date: Mar 2001 Location: Chippewa Falls,WI Vehicle: 1998 Forester L Black Diamond Pearl	Didn't cover the hole with anything. Lets more air in that way.

09-18-2003, 04:40 PM	#10
hunts Scooby Newbie Member#: 32198 Join Date: Jan 2003 Location: Morris County, NJ Vehicle: MY13 Impreza Limited 5-door hatchback	Subasaurus Rex: I took the "big box" but had it plugged up. Definitely a little bit noisier than stock at WOT. I was wondering if you had any problems with yours since you didn't plug up the hole, eg. water ingestion? We're gonna get hit with what's left of Hurricane Isabel tomorrow, so I don't think I'm going to experiment without my plug just yet. :P

09-18-2003, 05:07 PM	#11
impreza99obs Scooby Newbie Member#: 42623 Join Date: Sep 2003 Location: nyc Vehicle: 1999 Impreza obs	dump question, how do you take it off?? how many bolts??

09-20-2003, 08:07 PM	#12
dpjef Scooby Newbie Member#: 18984 Join Date: May 2002 Location: Belgium Vehicle: 2002 Impreza 2.0 dark blue	I regularly get email from MRT (mailinglist) and not long ago there was a section on removing the 'air intake silencer' and how it should improve performance. Bloody hell, if MRT says to take it out, then I'm taking it out!

09-21-2003, 12:06 AM	#13
WrcSpeed Scooby Newbie Member#: 33840 Join Date: Mar 2003 Vehicle: 2003 Impreza TS Silver	2 bolts and that's it Very easy cheap (0$) and you see the difference right away. but I have a 2003 not sure how it is on a 99 like yours

09-21-2003, 12:32 AM	#14
Machine Age Victim Scooby Specialist Member#: 29961 Join Date: Nov 2002 Chapter/Region: South East Location: my job is a hobbie to most Vehicle: 2008 BMW 328i Conv. 2001 Kawasaki ZR-7S	too much air is a bad thing?!? I modified mine myself. I'm using a panel filter that uses the front of the stock box and feeds from the hood scoop. That was the best way I saw to get as much air as possible. Still great low-end and strong all the way through. It also knocked 2 tenths off my 1/4 mile time

09-23-2003, 03:41 PM	#15
Machine Age Victim Scooby Specialist Member#: 29961 Join Date: Nov 2002 Chapter/Region: South East Location: my job is a hobbie to most Vehicle: 2008 BMW 328i Conv. 2001 Kawasaki ZR-7S	no answers to my question?? maybe I'll post a new thread

09-24-2003, 04:50 PM	#17
Machine Age Victim Scooby Specialist Member#: 29961 Join Date: Nov 2002 Chapter/Region: South East Location: my job is a hobbie to most Vehicle: 2008 BMW 328i Conv. 2001 Kawasaki ZR-7S	well, it is cold air (well as cold as the air could be after flowing across a dark painted hood in Florida) but it feed from the hood scoop. my '60 times always stayed consistant around 1.8-1.9, with a reaction time of .580 So I've done nothing to improve the flow of air beacause it's still the same diameter on the MAF? I also was thinking of putting the back on the box and cut the pipe out ( so there isn't a turn in it) and having the pipe curver around to feed from the hood scoop, maybe an angled opening into the pipe? oh and how bad is the turbulence over the scoop?? does it get enough ait into it or would a huge, hood-length, NACA vent be better?