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Old 08-28-2003, 10:19 PM   #1
twizzstyle
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Question intake "tone"

Ok, so this has baffled me forever....

A long time ago, I took out my intake silencer (snorkus). I loved the sound of the car, especially wide open, but there was this annoying tone. I assumed it came from the MAF. It doesn't cahnge with the RPM or anything, its just always there. And its LOUD. So annoying, that I had to put the snorkus back on....

Well now I got myself an MAF adapter and a big ol cone filter, knowing that of course I would have to deal with the tone again. I'm tolerating it for now, but I'm just wondering if it is normal. Also, I'd like to figure out what the heck this stupid tube is there for?!?!?!



I came to thinking today, that maybe that noise is just the air rushing over the opening of that tube inside there, kinda like blowing over the open end of a bottle....any ideas?
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Old 08-29-2003, 12:36 AM   #2
FuJi K
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well....when I installed a cone filter with adapter onto my Mom's '92 Legacy, it did have a throaty note/tone to it half&WOT. When the car is warmed up and is idling, there's that "blowing over the open end of the bottle" low whistle to it. I can hear it when I'm inside the house too!

It's like a low tone whistle like say a huge ship's horn or something. IMO I think it's normal because with the cone filter, there's less restriction so more sound.

btw, our Legacy doesn't have any snorkle or silencers at all...but it stilll have that low tone whistle. Sounds like a performance engine.
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Old 08-29-2003, 01:42 AM   #3
twizzstyle
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well, see the thing is...it doesn't sound cool (performance engine, haha)

and it isn't a whistle....its just....."boooooooooooooooooooooooooooooooooooo" pretty low tone really. and yeah, the car does have a nice throaty note to it, but this noise is completely separate. i was thinking of just sawing that tube off and plugging it up with something! haha. anyone know why its there?

and I can here the noise with the normal airbox/silencer, etc, its just a LOT quiter, almost un-noticable. but without that, its real loud.
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Old 08-29-2003, 06:25 PM   #4
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my wife's 2.2 has it too. I think it's unique to the 2.2, and I'm willing ot bet it has to do with the shape of the fender well. I'm not sure, but that's my best guess. try totally blocking off the fender well with cardboard or something else soft. see if the sound goes away. it sounds like a resonating sound... so there has to be a chamber that's doing the resonating. so take away the chamber or try pointing the sound in a different direction.

-IggDawg
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Old 08-29-2003, 07:24 PM   #5
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Quote:
Originally posted by twizzstyle
well, see the thing is...it doesn't sound cool (performance engine, haha)

and it isn't a whistle....its just....."boooooooooooooooooooooooooooooooooooo" pretty low tone really. and yeah, the car does have a nice throaty note to it, but this noise is completely separate. i was thinking of just sawing that tube off and plugging it up with something! haha. anyone know why its there?

and I can here the noise with the normal airbox/silencer, etc, its just a LOT quiter, almost un-noticable. but without that, its real loud.
I know *EXACTLY* the sound you're talking about. My L did this too when I took out the silencer. It sounds very much like someone blowing over the top of a bottle.

That sound went away when I got my intake. Here is a picture, this isn't off my car but it's exactly how mine looks. This is the GanzFlow intake. It removes the extra air tube thingie which may be what you're hearing.



I got rid of that extra plastic 'elbow' going from the fender to where the hood closes, that may be causing part of the problem. Also, there is a plug/cover you can buy at the dealer that closes up the hole closes to the front of the car, that'll make sure air can only enter the one hole next to your filter.

I'd shoot you pics of mine, but I dont have a digi cam. PM me if you want more info on my setup.

Good luck!

-MB
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Old 08-29-2003, 08:10 PM   #6
twizzstyle
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ok cool, so it seems like it IS just my intake tube. I'll try makin my own tube to go from the big box thing on top of the throttle body, down to the MAF. see if it changes. I wanted to get rid of the little elbow thing.....but the bolt seems to be stripped, it spins, but won't come out. I guess i'll just have to cut it off with my dremel, but the stupid bolt will still be there. Thanks for the info Matt, I'll probably be PM'n ya!
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Old 08-29-2003, 09:08 PM   #7
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Ok first question...how do you have a 2.2 rs 98. I got a bent tube with my intake that completely eliminated all boxs, i love the sound. I lost the sound thoo when i did a full exhaust, now that takes over for being noisey but i still love it.
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Old 08-30-2003, 12:49 PM   #8
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Talking



There should be quotes around the "2.2 RS".....that's just what I call it!
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Old 08-30-2003, 04:52 PM   #9
SubeDonC
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im guessing its a moded "L" or a RS that thats been frankensteind
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Old 08-31-2003, 01:47 PM   #10
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yeah yeah, just a 98 2.2 L. So, whats everyones opinion on my best option here? Don't have much money cause I'm a college kid so.....

Making my own "intake"....If I do something like Matt's...the GanzFlow, could I just put in a pipe from the big box to the MAF? And what could I use? I thought PVC, but my friend thinks it would melt. Or is there somewhere I could buy a *VERY* inexpensive pipe to go from the throttle body to the MAF (ie long bent pipe)?
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Old 08-31-2003, 02:56 PM   #11
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I don't know if you've seen the Legacy's intake piping but it's a tube from the TB down to the airbox, then the passenger firewall. I took the airbox out and placed on the cone filter w/ adapter in place of where the box connected.

I don't know if there's going to be much of a difference if you change the tubing unless the port where the intake pipe connects to the airbox is smaller than the piping itself, than there might be a difference.

A friend of mine changed his 90 degree bend pipe where it goes into the filterbox. From 2" to 3" pipe. But this is a MY00 RS though....
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Old 08-31-2003, 09:43 PM   #12
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FYI, I believe the stupid tube that hangs off the intake is either a 1/4 wave resonator or helmholtz resonator. Their purpose is to basically reduce sound pressure waves in the intake.
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Old 09-01-2003, 01:03 AM   #13
twizzstyle
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hmmm, interesting. That's kinda cool.
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Old 09-19-2003, 04:29 AM   #14
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The Forester 2.5L has that I can't remember if my 1.8 Impreza has that.. it looks stupid..
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Old 09-19-2003, 10:27 AM   #15
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My 2.2l with the snorkus ectomy makes this same noise. I guess that was the point of the snorkus, to eliminate this noise. I wonder if adding the u-shaped tube from the airbox through the fender would help. There is a big thread on this tube that replaces the snorkus but allows you to keep the oem intake piece from the engine bay to the fender. Anyone tried that yet?
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