resonatorectomy how-to

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Lupin
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resonatorectomy how-to

Postby Lupin » Wed Dec 22, 2004 12:50 pm

I deiced to do a small how-to on performing a resonatorectomy, as there are always questions about doing it.

The car was a MY99 but it is basically the same for every rex.

You can click on the images for a larger view

The basic tools needed are.

10mm spanner
Philips head screwdriver
Flat head screwdriver
Pointy nose pliers
Jack
And about 45mins of your time

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1. jack up the car and remove the right hand wheel

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2. With the wheel off its time to remove the plastic inner guard.
You will see a few small plastic clips that need to be removed. Depending on the age of the car they can become quite brittle, so take great care in removing them. This is where the flat blade and the pointy nose come in handy. You don’t need to completely remove the inner guard, just the front corner.

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3. Crawl under the car and do the same for the guard under the car. You need to remove this one completely from the car.

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4. While you are under there, remove the 10mm nut holding the bottom of the resonator in place.

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5. Moving to the inner guard there is a small bracket that makes life much easier if you remove it. There are 2 bolts holding it in one here in the guard,

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and the other here in the engine bay. Both these need to be removed as the top one actually holds the resonator in place.

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It’s much easier to do with the duct removed

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6. With a bit of a wiggle that big ugly black box is removed.

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7. Put it all back together, wash hands and hit the roads.

I wish I had a way of recording the sound difference it makes.

You can now hear he turbo whistle much better and the induction note is much, much deeper.
Last edited by Lupin on Sat Jan 09, 2010 7:37 am, edited 1 time in total.
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ska
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Postby ska » Thu Dec 30, 2004 10:10 pm

Just took my resonator out...thanks for this post mate!! helped heaps...only broke 2 clips...bloody fragile little buggers...

I think it's improved my fuel economy since taking the resonator out... drove to philip island and back...did 290kms on 24 litres of gas...

happy customer...
MY00 - Stock standard, removed intake resonator, 3" TB exhaust,

on shopping list... Power FC, AVCR, springs, sway bars, mags...that should keep me happy til next christmas...

ref1ux
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Postby ref1ux » Sun Jan 02, 2005 10:58 am

just did the above and what a difference :).

Car sounds so much nicer, and is more responsive :)

Huge thanks

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Age
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Postby Age » Sun Jan 02, 2005 12:33 pm

Great Diy Lupin :wink:

By memory i think a PVC pipe of 70mm will fit into the airbox. So with a little pipe and a few 45's or 90 degree bend you could make up a nice intake pipe that feed into the OEM airbox :wink:

Bunnings or Reece, or any GOOD plumbing supply store should stock 70mm pipe 8)

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Lupin
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Postby Lupin » Sun Jan 02, 2005 3:56 pm

Yea ive already done that just have to do the pics.

Too lazy over new years
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drnick
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Postby drnick » Fri Jan 14, 2005 2:13 pm

Even easier with an Forester XT, you don't need to jack it up! :)

S
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Speedway
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Postby Speedway » Fri Jan 21, 2005 3:42 pm

Hey guys

I have recently (6mths ago) bought an 02 STi which i am firmly intent on keeping bog standard until the warranty runs out. Once that time arrives however, i will be looking at doing what i can to increase my bottom end torque and make the car more driveable at lower RPM (turbo's - love'em AND hate'm).

Is a resonarectomy going to increase my powere specs in any way, or only simply my exhaust note and economy. Mind you i will be happy with even the last.

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deafwish
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filter

Postby deafwish » Fri Jan 21, 2005 3:49 pm

I would highly reccomend anyone doing this mod to buy a 4" subwoofer box port and install it in the airbox to be used as a velocity stack.
The rounded edges will allow alot smoother airflow as opposed to a flat inlet from when you remove the resonator.
My 2c :roll:
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Borti
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Postby Borti » Tue Jan 25, 2005 2:34 pm

I did the resonator-ectomy to my car, except i removed the box and installed the GP-Moto intake elbow. I think I am going to put mine back on as I plan on upgrading to a new vehicle soon.

Here is a site where I got it:

http://www.jscspeed.com/wrx/intake/gpmo ... eelbow.htm

You can also google it as GP Moto intake elbow.

Budge
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Postby Budge » Tue Jan 25, 2005 2:46 pm

I removed the resonator, hack sawed the bottom 'container' bit off and put it back on. Therefore I keep it looking 100% stock and should get some ram air benefits from keeping the pipe in place but also sucking any extra air it needs from the guard. It sounds good too!
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wokka wokka
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Postby wokka wokka » Tue Jan 25, 2005 3:30 pm

OK, that looks simple.

Questions:

1) What are benefits of removal (nice noise? Better economy? power, location of power ie midrange?)

2) What are the penalties? (can't get something for nothing!)

If removing it is better, why the hell is it there in the first place? What does it do?

From what I see the duct in the engine bay takes air into the guard, and into the resonator, then the resonator feeds back into the engine bay, and into the airbox. Is this correct? If the resonator is off, does the Duct in the engine bay need to be there?

Adrian, where would you run the pipe to/from? (wouldn't any external hole (vent under indicator etc) just suck up crap?)

Any answers or corrections gratefully received.
Will.

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chop sticks
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Postby chop sticks » Tue Jan 25, 2005 5:03 pm

This mod was great for the induction noise but it didnt really seem to benefit power wise. I will be looking at a APS CAI Kit though.
2003 MY03 Subabru WRX

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Lupin
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Postby Lupin » Wed Jan 26, 2005 12:31 am

The resonator is there to quieten the intake. Its also a little restrictive.

I have a duct that runs to the brake duct to draw in cold air.


I dont belive there is much of a power increase prob about the same as you get from a performance filter.

You can now actualy hear the turbo spooling up and with the factory BOV you can actualy hear it with the window down.

The Pro is that under the bonnet it all looks stock and you get to keep the air box, negating any nasty AFM problems.

And i guess the only con coud be the noise.
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cpitts
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Postby cpitts » Fri Feb 04, 2005 8:10 pm

Hey Lupin, good stuff there man.

To help answer some of these questions, I'll be doing some before and after dyno's with and without this mod on a MY05 so that people can at least categorically say 'yes or no' on the power/torque changes. Hopefully this'll be in the next few months. :)
'07 Lib GT Spec B <- adjusting
Done: Intake, Brakes, Stereo 90%, bars, AVO TMIC
To fit: Sil intake, ECU, 3 Port, Walbro
WWW (button below) for my Subaru/Audi dyno's, detailing, pics and mods!

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Resonatorectomy

Postby Y2K WRX » Mon Apr 11, 2005 10:28 am

Hey Lupin,

I did this on the weekend, took me about an hour, one screw near the airbox took me about 20minutes of that hour to remove, but once that was off everything went like a dream. Took the car for a spin and the extra induction noise was awesome.

Thanks for the DIY!!

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cris41
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Postby cris41 » Tue Apr 19, 2005 11:36 pm

excuse the ignorance but is this mod useful if u have a apexi pod?

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cpitts
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Postby cpitts » Wed Apr 20, 2005 12:40 am

if u have a pod, then your air flow isn't going via the resonator, thus u don't have the issue. Depending on the placment of your pod though, u may want to remove the resonator and put some cooler air ducting to help feed some cooler air to the pod. (start this discussion in General area rather than here :D )
'07 Lib GT Spec B <- adjusting
Done: Intake, Brakes, Stereo 90%, bars, AVO TMIC
To fit: Sil intake, ECU, 3 Port, Walbro
WWW (button below) for my Subaru/Audi dyno's, detailing, pics and mods!

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wt9bind
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Postby wt9bind » Wed Apr 27, 2005 12:44 pm

Just did the mod, can hear no difference at all :cry:

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cpitts
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Postby cpitts » Wed Apr 27, 2005 12:47 pm

Reset your ECU... then take it for a good run. :wink:
'07 Lib GT Spec B <- adjusting
Done: Intake, Brakes, Stereo 90%, bars, AVO TMIC
To fit: Sil intake, ECU, 3 Port, Walbro
WWW (button below) for my Subaru/Audi dyno's, detailing, pics and mods!

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wt9bind
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Postby wt9bind » Wed Apr 27, 2005 12:52 pm

cpitts wrote:Reset your ECU... then take it for a good run. :wink:


Have a Link 44s ECU so I doubt it needs resetting.

I didnt give it heaps, maybe I just need to flog it up to 6.5k before i hear something :?

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