I'd like a definitive answer on resonator mod

statman · 07-19-2002, 02:11 PM

Does pulling out the stock resonator actually free-up airflow and help the car to breathe (thereby potentially increasing HP) or is it a "sound only" mod? I've heard both explanations given. I'd like to know the general consensus before I pull the thing out...

Thnx..

Statman

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

BeavisNuke · 07-19-2002, 02:20 PM

Whatever air it does free up is supposed to be negligible I believe.

Most consider it a "sound-only" mod.

WagonRX · 07-19-2002, 02:25 PM

According to Shiv, it's just a sound mod.

MAD REX · 07-19-2002, 02:36 PM

More air is always better

Cosworth · 07-19-2002, 02:49 PM

According to MRT, who have much more experience than Shiv, its not just a "sound" mod, it has actual measured performance benefit. The benefit is rather slight, but it does exist.

02WRX_BLUE · 07-19-2002, 03:02 PM

When the TURBO is sucking all the air to compress... I would say that it would not show any difference.

However, think about the initial air flow that is happening before turbo is spooiling to the max boost... More air is available for engine to suck in than if you didn't remove the resonator so that the initial response would be better and should give more power... It would also help TURBO to spooil as well.....

This is the reason why you feel better response from the "GAS padal" when you do the intake mod in general....

I wouldn't completely remove it... I would cut the resonator in half so that you can still suck in the air from the fender wall...

Dan from PA.

kenchan · 07-19-2002, 05:18 PM

yah, hacking it does seem to free up more initial air and provide a more reponsive acceleration. im letting it breath from the fender area with a hacked resonator. some have capped the bottom of the Y piping of the resonator so that it would breath directly from the front intake. i wouldnt do it. 1st off theres more unnecessary piping that the air needs to be sucked from and, i bet there's more turbulence if you cap the bottom portion of the Y causing less air to smoothly flow into the air box.

JohnGalt00 · 07-19-2002, 09:39 PM

I did the mod, I didn't seem to get much power, if any, but the throttle was definitely more responsive according to the butt dyno.

Vegumkoho · 07-19-2002, 10:57 PM

I will be doing it this week-end. I got a velocity thingy from a friend (FREE) so I won't have to hack. I don't expect noticable power gains, maybe better throttle response and better noise.

jaxscuby · 07-19-2002, 11:01 PM

oops..i took mine out along with snorkel..
replaces with velocity stack...filled up the gas tank and got 320 miles when i would usually get 300 miles out of a tank.
mixed mileage city & highway. going a sunday drive to see if this holds true..other trip i would get around 300 to warning light..so will have some new data as far as mileage after sunday's trip..

but the swoosh is definitely noticable...

AZScoobie · 07-19-2002, 11:25 PM

Quote:

Originally posted by statman
Does pulling out the stock resonator actually free-up airflow and help the car to breathe (thereby potentially increasing HP) or is it a "sound only" mod? I've heard both explanations given. I'd like to know the general consensus before I pull the thing out...

Thnx..

Statman

I tried it. I noticed nothing but noise. I was thinking of trying the new Prova ducts from Japan. Vividracing.com has them instock. I got a chance to see them in person yesterday. The Prova duct replaced the resonator and pipes the front duct into the air box with a nice smooth Fiber/plastic duct. The only drawback is the cost.. Its from a high end Japanese tuner and it was imported.

CT

cohlineman · 07-20-2002, 02:35 AM

I just got in from the garage after an hour battle with the snorkus (its lower bolt causing very bad language).Aquick trip around the block did show me a bit of added throttle response but maybe I'm just convincing myself!I did notice a very nice augmentation in sound for sure.The cutting of the snorkus sounds like a good way to isolate the intake , I might just buy a spare for that but I will try the weather stripping first.For looks I re-mounted the intake scoop and am thinking of wrapping it in heat cloth adhesive...it's always more air, I think.Got news that my new exhaust is now on the pacific in a ship from the land of the rising sun...that will definitely help in the sound dept. too!

jaxscuby · 07-20-2002, 08:16 AM

heres a picture of air box with stack..

jaxscuby · 07-20-2002, 08:17 AM

fender view..

MackDaddy · 07-20-2002, 08:41 AM

No problem, glad to see someone remembered me for reference.

This mod helps big time. Add in a nice panel filter (Blitz, K&N) and it makes for better fuel milage, and increased throttle response. For reference, I've got the following to compliment it as well:

ATR catless up
Stromung catless down
Stromung 3rd cat eliminator (on the way)
Prodrive muffler
Samco IC hoses
Samco inlet hose (not installed yet)
Zerosports intake pipe (on the way)
3/16" FEBC solenoid connector with 1/16" bleed hole
4 point grounding mod
Mobil1 10w30

All these in combination make for a very peppy daily driver. Even with the AC on, it's still quick as all get out. The biggest help in the "AC on" department is the connector mod. You really need to be carefull of this one though (read the huge thread.) EGT's can rise quickly at part throttle, if not judicious with the right foot.

I've got some insight on that on the last few pages of connector mod thread.

Do the velocity stack / panel filter. It's cheap, and it works.

Jim

WizardBlackWRX · 07-20-2002, 02:04 PM

Air in any flow system will resonate. That is why the exhaust and headers must be a particular size. They will hurt performance in one area and help it in another according to rpms or exhaust pulses, etc. The same thing holds for intake airbox volume. Sportbikes have tuned with this for many years. Formula racing as well. Even though the turbo is sucking the air, it still has to fight the restrictions. That is what an air intake does, reduce the restriction. The resonator will let the intake volume match what the engineers wanted to create a beneficial resonation in the air to feed the turbo a little better at a certain speed, rpm, whatever. By removing it, you eliminate that effect, but with modified intake and exhaust, etc. you are changing where the improved effect is anyways. All of this is very slight, though.

saggioWRX · 07-23-2002, 10:45 AM

Where do you buy the Velocity Stack???

sherifx · 07-23-2002, 11:23 AM

Quote:

Originally posted by saggioWRX
Where do you buy the Velocity Stack???

ditto

sherifx

MackDaddy · 07-23-2002, 11:51 AM

Quote:

Originally posted by saggioWRX
Where do you buy the Velocity Stack???

www.summitracing.com

PN (I think, I'm at work) AVC-19002 $21.95

Jim

Edit: Just checked, that's the one!

Direct link http://store.summitracing.com/defaul...rchType%3DBoth

is2scooby · 07-26-2002, 08:19 AM

Awesome!

How is it secured (to the airbox, and to the fender?)

Any cutting?

jblaine · 07-26-2002, 10:35 AM

Be careful.

I am 99% positive the velocity stack shown in pics above is the WRXfx / Psi-Fi Motorsports one, and not the Summit Racing one.

I don't know of anyone who has purchased, installed, and reported on the Summit Racing part above. Perhaps MackDaddy can elaborate more, since the SR site has no pictures or details on the product whatsoever that I can find.

jblaine · 07-26-2002, 12:09 PM

Err, ignore me. That apparently IS the Summit Racing one. Odd.

Sparks · 07-26-2002, 12:40 PM

The seal in the bottom of the air box holds it in place and yes that is the Summit stack.

MackDaddy · 07-26-2002, 01:27 PM

Quote:

Originally posted by jblaine
Err, ignore me. That apparently IS the Summit Racing one. Odd.

And yes, it's the VS from summitracing.com

Jim

jaxscuby · 07-27-2002, 07:43 AM

Quote:

Originally posted by is2scooby
Awesome!
How is it secured (to the airbox, and to the fender?)
Any cutting?

after i got the velocity stack into airbox. I slide a piece of 3" diameter hose onto the end, it needed some coaxing, very tight fit, which is good, so it won't slip back from any vibration..
was thinking about a hose clamp, but the polished aluminum
was to pretty to put a hose clamp on it...

07-19-2002, 02:11 PM	#1
statman Scooby Newbie Member#: 20860 Join Date: Jul 2002 Location: Fort Worth, TX Vehicle: 2002 WRX Silver	I'd like a definitive answer on resonator mod... Does pulling out the stock resonator actually free-up airflow and help the car to breathe (thereby potentially increasing HP) or is it a "sound only" mod? I've heard both explanations given. I'd like to know the general consensus before I pull the thing out... Thnx.. Statman * Registered users of the site do not see these ads.

07-19-2002, 11:01 PM	#10
jaxscuby n00b Moderator Moderator Member#: 10613 Join Date: Sep 2001 Chapter/Region: South East Location: F L O R I D A Vehicle: 2002 USDM WRX WRB	anything to help it breathe oops..i took mine out along with snorkel.. replaces with velocity stack...filled up the gas tank and got 320 miles when i would usually get 300 miles out of a tank. mixed mileage city & highway. going a sunday drive to see if this holds true..other trip i would get around 300 to warning light..so will have some new data as far as mileage after sunday's trip.. but the swoosh is definitely noticable... Last edited by jaxscuby; 07-20-2002 at 08:13 AM.

07-20-2002, 02:35 AM	#12
cohlineman Scooby Newbie Member#: 20982 Join Date: Jul 2002 Location: Santa Rosa California Vehicle: 2002 Impreza WRX Platinum Silver	just finished snorkusectomy I just got in from the garage after an hour battle with the snorkus (its lower bolt causing very bad language).Aquick trip around the block did show me a bit of added throttle response but maybe I'm just convincing myself!I did notice a very nice augmentation in sound for sure.The cutting of the snorkus sounds like a good way to isolate the intake , I might just buy a spare for that but I will try the weather stripping first.For looks I re-mounted the intake scoop and am thinking of wrapping it in heat cloth adhesive...it's always more air, I think.Got news that my new exhaust is now on the pacific in a ship from the land of the rising sun...that will definitely help in the sound dept. too!

07-20-2002, 08:16 AM	#13
jaxscuby n00b Moderator Moderator Member#: 10613 Join Date: Sep 2001 Chapter/Region: South East Location: F L O R I D A Vehicle: 2002 USDM WRX WRB	velocity stack heres a picture of air box with stack..

07-20-2002, 08:17 AM	#14
jaxscuby n00b Moderator Moderator Member#: 10613 Join Date: Sep 2001 Chapter/Region: South East Location: F L O R I D A Vehicle: 2002 USDM WRX WRB	heres looking into fender.. fender view..

07-19-2002, 02:20 PM	#2
BeavisNuke Scooby Specialist Member#: 14981 Join Date: Feb 2002 Location: Boca Raton, FL Vehicle: 2002 WRX Sedan WRB TurboXS Stage 2.5	Whatever air it does free up is supposed to be negligible I believe. Most consider it a "sound-only" mod.

07-19-2002, 02:25 PM	#3
WagonRX Scooby Specialist Member#: 7480 Join Date: Jun 2001 Location: So San Francisco Vehicle: WRB WRX 5 Door VS2 12.9 @105 MPH-4EAT	According to Shiv, it's just a sound mod.

07-19-2002, 02:36 PM	#4
MAD REX Scooby Specialist Member#: 18163 Join Date: Apr 2002 Location: Denver Vehicle: 2002 2.5 WRX MBP	More air is always better

07-19-2002, 02:49 PM	#5
Cosworth Scooby Specialist Member#: 3887 Join Date: Jan 2001 Chapter/Region: Tri-State Location: Middletown, NJ Vehicle: 08 Taco, 98 M3/4/5 '00 RC51, '08 KTM	According to MRT, who have much more experience than Shiv, its not just a "sound" mod, it has actual measured performance benefit. The benefit is rather slight, but it does exist.

07-19-2002, 03:02 PM	#6
02WRX_BLUE Scooby Specialist Member#: 13704 Join Date: Dec 2001 Location: Chester Springs, PA Vehicle: 2006 EVO MR Apex Silver	When the TURBO is sucking all the air to compress... I would say that it would not show any difference. However, think about the initial air flow that is happening before turbo is spooiling to the max boost... More air is available for engine to suck in than if you didn't remove the resonator so that the initial response would be better and should give more power... It would also help TURBO to spooil as well..... This is the reason why you feel better response from the "GAS padal" when you do the intake mod in general.... I wouldn't completely remove it... I would cut the resonator in half so that you can still suck in the air from the fender wall... Dan from PA.

07-19-2002, 05:18 PM	#7
kenchan Scooby Guru Member#: 15106 Join Date: Feb 2002	yah, hacking it does seem to free up more initial air and provide a more reponsive acceleration. im letting it breath from the fender area with a hacked resonator. some have capped the bottom of the Y piping of the resonator so that it would breath directly from the front intake. i wouldnt do it. 1st off theres more unnecessary piping that the air needs to be sucked from and, i bet there's more turbulence if you cap the bottom portion of the Y causing less air to smoothly flow into the air box.

07-19-2002, 09:39 PM	#8
JohnGalt00 Scooby Newbie Member#: 17035 Join Date: Mar 2002 Location: Dallas, TX Vehicle: 02 WRX Black	I did the mod, I didn't seem to get much power, if any, but the throttle was definitely more responsive according to the butt dyno.

07-19-2002, 10:57 PM	#9
Vegumkoho Scooby Specialist Member#: 12059 Join Date: Nov 2001 Location: colorado springs CO Vehicle: 2002 WRX Blue Wish all roads were dirt	I will be doing it this week-end. I got a velocity thingy from a friend (FREE) so I won't have to hack. I don't expect noticable power gains, maybe better throttle response and better noise.

07-20-2002, 08:41 AM	#15
MackDaddy Scooby Newbie Member#: 15451 Join Date: Feb 2002 Chapter/Region: MWSOC Location: Lewis Center, OH USA Vehicle: 2013 XV Crosstrek Desert Khaki - CVT	Hey, that's my car! No problem, glad to see someone remembered me for reference. This mod helps big time. Add in a nice panel filter (Blitz, K&N) and it makes for better fuel milage, and increased throttle response. For reference, I've got the following to compliment it as well: ATR catless up Stromung catless down Stromung 3rd cat eliminator (on the way) Prodrive muffler Samco IC hoses Samco inlet hose (not installed yet) Zerosports intake pipe (on the way) 3/16" FEBC solenoid connector with 1/16" bleed hole 4 point grounding mod Mobil1 10w30 All these in combination make for a very peppy daily driver. Even with the AC on, it's still quick as all get out. The biggest help in the "AC on" department is the connector mod. You really need to be carefull of this one though (read the huge thread.) EGT's can rise quickly at part throttle, if not judicious with the right foot. I've got some insight on that on the last few pages of connector mod thread. Do the velocity stack / panel filter. It's cheap, and it works. Jim Last edited by MackDaddy; 07-20-2002 at 08:47 AM.

07-20-2002, 02:04 PM	#16
WizardBlackWRX Scooby Specialist Member#: 14979 Join Date: Feb 2002 Location: Columbus, OH Vehicle: 2002 WRX Black	Air in any flow system will resonate. That is why the exhaust and headers must be a particular size. They will hurt performance in one area and help it in another according to rpms or exhaust pulses, etc. The same thing holds for intake airbox volume. Sportbikes have tuned with this for many years. Formula racing as well. Even though the turbo is sucking the air, it still has to fight the restrictions. That is what an air intake does, reduce the restriction. The resonator will let the intake volume match what the engineers wanted to create a beneficial resonation in the air to feed the turbo a little better at a certain speed, rpm, whatever. By removing it, you eliminate that effect, but with modified intake and exhaust, etc. you are changing where the improved effect is anyways. All of this is very slight, though.

07-23-2002, 10:45 AM	#17
saggioWRX Scooby Specialist Member#: 18994 Join Date: May 2002 Chapter/Region: NWIC Location: Seattle WA, Vehicle: 08 GTS 05 AW STi	Where do you buy the Velocity Stack???

07-26-2002, 08:19 AM	#20
is2scooby Scooby Specialist Member#: 19851 Join Date: Jun 2002 Location: Honolulu, HI Vehicle: 02 WRX Aspen White/12.75@105.67	Awesome! How is it secured (to the airbox, and to the fender?) Any cutting?

07-26-2002, 10:35 AM	#21
jblaine Scooby Guru Member#: 8512 Join Date: Jul 2001 Chapter/Region: South East Location: St. Pete, FL Vehicle: 2002 WRX chassis... stage-infinity.com	Be careful. I am 99% positive the velocity stack shown in pics above is the WRXfx / Psi-Fi Motorsports one, and not the Summit Racing one. I don't know of anyone who has purchased, installed, and reported on the Summit Racing part above. Perhaps MackDaddy can elaborate more, since the SR site has no pictures or details on the product whatsoever that I can find.

07-26-2002, 12:09 PM	#22
jblaine Scooby Guru Member#: 8512 Join Date: Jul 2001 Chapter/Region: South East Location: St. Pete, FL Vehicle: 2002 WRX chassis... stage-infinity.com	Err, ignore me. That apparently IS the Summit Racing one. Odd.

07-26-2002, 12:40 PM	#23
Sparks Scooby Specialist Member#: 16495 Join Date: Mar 2002 Chapter/Region: South East Location: Jacksonville Vehicle: 2013 BRZ Sterling Silver Metallic	The seal in the bottom of the air box holds it in place and yes that is the Summit stack.

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