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Old 05-02-2004, 09:15 PM   #1
AcquaCow
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Default Silened my Cobb CAI (almost)

Just wanted to link my post on wrxforums:
http://www.wrxforum.com/cgi-bin/ulti...c;f=4;t=001204

Quote:
I would like to announce, to all who thought the Cobb CAI was too loud, that it can be tamed!

Most of the noise that you hear at WOT is just the sound of the intake reverbing off the fender and outter wall of the engine bay. This reverb is easily cancled out with some double sided foam tape and a few pieces of 1in thick foam.

I just found some lying around in a box that was used for shipping electronics (Hard drive).

I put down a few strips of the double sided tape in my fender well, stuck the foam against it (directly across from the CAI opening) and put everything back together.

It's much more civil now and doesn't draw attention to you when powering through a turn.

I'll get pics online later in the week after finals.

-- Dave
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Old 05-02-2004, 10:31 PM   #2
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You loose 100 iggpoints
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Old 05-03-2004, 12:52 AM   #3
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Wouldn't this disrupt airflow into the intake inlet causing loss in power?

BTW...Wouldn't dynomatt, or any other smooth sided sound deadening material, be better?
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Old 05-03-2004, 12:59 PM   #4
Section 8
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Great.

A post with nothing, linking to another post with nothing.

Post when you HAVE somthing.
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Old 05-03-2004, 02:00 PM   #5
AcquaCow
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Oh, I _have_ something...I just need to take pics.

I posted to remind myself.

As for airflow, no, it does not disrupt any at all. This was my main concern.

Dynamat? Dynamat would stop the outside panel itself from vibrating, but would not stop the sound from reverbing. You need something to absorb the sound and slow it down. Foam fits this job perfectly.

Also, the 2 squares of foam will weigh a lot less than an equal sized sheet of dynamat.

Pics tonight.

-- Dave

Oh and in response to:
Quote:
Originally posted by Kostamojen
You loose 100 iggpoints
I didn't say I was going to keep the foam there...this was just for testing a theory.
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Old 05-03-2004, 04:11 PM   #6
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I love you.


I hate, hate, hate, hate, hate how the COBB intake just lays in the engine bay and 99% of the time it falls out of the fender opening. If your pics look good enough, I might give it a shot.

-Matt
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Old 05-03-2004, 04:38 PM   #7
AcquaCow
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If it's falling out of the fender opening, you don't have it adjusted/tweaked right.

Lengthen it out a bit more, loosen those hose clamps and stick it a full inch into the fender well.

-- Dave
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Old 05-03-2004, 04:40 PM   #8
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I might have to give that a shot.
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Old 05-03-2004, 04:40 PM   #9
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piiiiiics
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Old 05-03-2004, 04:45 PM   #10
AcquaCow
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Gimmie 2 hours.
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Old 05-03-2004, 04:57 PM   #11
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I cut out the bottom of a coozie and slid it on the end that goes into the fender. Does the same thing I guess. Works well for me.
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Old 05-03-2004, 05:00 PM   #12
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Mine's never fallen out of the fender, either, but I've been just short of getting into research on quieting my COBB CAI. I -did- get pulled over for a suspected exhaust problem with it...

Where'z the pics at?
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Old 05-03-2004, 05:27 PM   #13
AcquaCow
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I'm leaving work as soon as my freshly patched email server reboots.

Within an hour.

-- Dave
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Old 05-03-2004, 05:30 PM   #14
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I saw a post some time ago with a photo that had a part number for an actual subaru plastic part that covers up that hole that stays where the air intake resonator (snorkus) usually is. Anybody know what the part # is? That may help quiet the CAI down also...
BTW, comming from a J tube intake, the Injen CAI is not loud at all!
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Old 05-03-2004, 06:42 PM   #15
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Alright...took pics, but they aren't anything special IMO, but you'll get the idea.

(resizing and uploading now)
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Old 05-03-2004, 07:51 PM   #16
AcquaCow
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Here are the pics:

CAI Installed in engine bay


CAI


CAI detached


Hole that CAI sits in


Plastic cover removed
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Old 05-03-2004, 07:51 PM   #17
AcquaCow
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CAI back in place


Installed position


Space infront of CAI when installed


Area above CAI (top of fender well)


Area below CAI (down towards bumper)


Spacing between CAI and that thing everyone complains it "rubs" against (note angle between filter box and top half of CAI)



The images are mostly self-explanitory, but as you can see, there's a good 4in of space infront of the CAI even with the 1.5in layer of foam.

I actually have one smaller 1/2in layer behind the gray packing foam, directly infront of the CAI opening.

The results from having the foam here removes the loud roar from the CAI at WOT and leaves you with more of a civil grumble.

If you have any questions, ask away.

-- Dave
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Old 05-03-2004, 07:54 PM   #18
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pretty cool, now if I could only hear my cobb CAI with my setup. All I got is exhaust noise now.
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Old 05-03-2004, 09:09 PM   #19
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That foam is going to start degrading and getting sucked into the intake.
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Old 05-03-2004, 11:07 PM   #20
AcquaCow
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Quote:
Originally posted by Kostamojen
That foam is going to start degrading and getting sucked into the intake.
Talk about the glass being half empty...sheesh...

That foam will last quite a long time there...and if it ever does degrade, the filter will catch it and it can be replaced.

Now go back to the hole from which you crawled.
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Old 05-03-2004, 11:09 PM   #21
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Hey, aquacow, where did you get that plastic cover that plugs up the hole in the fender well next to where the CAI goes in to?
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Old 05-03-2004, 11:22 PM   #22
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Quote:
Originally posted by AcquaCow
Talk about the glass being half empty...sheesh...

That foam will last quite a long time there...and if it ever does degrade, the filter will catch it and it can be replaced.

Now go back to the hole from which you crawled.

Ummm...Without seeing some better picturs of the inner fender well (Remove the plastic wheel well cover and there you go) I'm going to go out on a limb and say that foam IS dirupting airflow from your bumper vents, through the fender, and into the intake. How much, I don't know but it looks like it takes up quite a bit of space in there.

OH yeah...IBglassishalfemptyyoujerk.
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Old 05-03-2004, 11:55 PM   #23
AcquaCow
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based on the above image, there's atleast 4in of free space infront of the opening for the intake (it's actually 4.5in exactly). There's plenty of air for it to grab with that kind of space all around it.

I'm pretty sure you could put a vaccum sensor in there before/after the foam and see if there's any increased suction due to not enough air...I doubt the numbers would change.

That foam would have to get within 2in of that opening before you start restricting any flow.

I took the car to WOT and watched the foam...didn't move one bit.

I can't give a firm yes or no on this w/o pricy equipment though.

-- Dave
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Old 05-04-2004, 02:13 AM   #24
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Plugging up that other hole on your fender wall might help with volume.

*crawls back under his 15,000 post rock*
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Old 05-04-2004, 09:22 AM   #25
AcquaCow
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Quote:
Originally posted by Kostamojen
Plugging up that other hole on your fender wall might help with volume.
*Note: (it is plugged foo!)
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