Exhaust baffle/ box structure between cat and resonator? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ahausheer · 04-19-2012, 03:13 PM

I searched and could not find anything definitive on this forum or elsewhere so forgive me it has been discussed. Pictures that show the underside of the 86 there is a device inline with the exhaust between the cat and resonator. It is a small box with a rounded side. It looks somewhat like a mini branch resonator but it could also be some sort of sound baffle. Does anyone know precisely what this is? I have not seen such a device on any other car. I have seen baffles on the BOSS's side exhausts and I have seen branch resonators on aftermarket systems but none look like this structure. Any Ideas?

Draco-REX · 04-19-2012, 04:36 PM

Quote:

Originally Posted by ahausheer

I searched and could not find anything definitive on this forum or elsewhere so forgive me it has been discussed. Pictures that show the underside of the 86 there is a device inline with the exhaust between the cat and resonator. It is a small box with a rounded side. It looks somewhat like a mini branch resonator but it could also be some sort of sound baffle. Does anyone know precisely what this is? I have not seen such a device on any other car. I have seen baffles on the BOSS's side exhausts and I have seen branch resonators on aftermarket systems but none look like this structure. Any Ideas?

Have a pic?

R0ME0 · 04-19-2012, 04:45 PM

Here's a few pics but I don't see this box that you speak of.

Chenslee · 04-19-2012, 04:50 PM

It's closer to the engine. You can see the resonator in those pics, it's upstream of that.

RRnold · 04-19-2012, 04:53 PM

Is this what you are asking about? On the headers?

http://www.ft86club.com/forums/showt...?t=2636&page=4

old greg · 04-19-2012, 07:44 PM

He's talking about this bit:

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GenkiElite · 04-19-2012, 07:54 PM

Looks like a pre-cat. My old 02 Spec V had one. Tt caused a lot of problem for spec owners. The pre-cat woud degrade and bitw were getting sucked back into the head. I had a header on mine so the pre-cat was removed as it was a port of the exhaust manifold.

Oh, I just saw the diagram. Not exactly the same as what i had but could still be a pre-cat. Not uncommon for vehicles to have multiple cats...meow

WhiteGDB · 04-19-2012, 08:16 PM

Can't be a pre-cat that far down stream. Probably just another resonator.

bimmerboy · 04-19-2012, 08:20 PM

Quote:

Originally Posted by WhiteGDB

Can't be a pre-cat that far down stream. Probably just another resonator.

+1

ahausheer · 04-19-2012, 09:58 PM

^Also, its downstream of the CAT so its not a pre-cat.

Yeah it would make sense if it was a resonator I've just never seen one look like that, also, I've never seen 2 resonators so close together. I have a hunch there might be something else to it, perhaps something for the tunners.

serialk11r · 04-19-2012, 11:17 PM

Someone pointed out in an older thread that it looked like a Helmholtz resonator, I have no idea how noise suppression is usually carried out but I assume it's to tune some certain frequency band.

Calum · 04-20-2012, 05:52 AM

could be the cause of the torque dip.

[/troll]

Sasquachulator · 04-20-2012, 10:49 AM

Quote:

Originally Posted by Calum

could be the cause of the torque dip.

[/troll]

Everything that looks like an anomaly is the cause of the torque dip, sheesh i thought everyone knew that....

[/troll]

Calum · 04-20-2012, 01:45 PM

Hey, my post ended the trolling for this thread

[/troll]

04-19-2012, 03:13 PM	#1
ahausheer Re-member Join Date: Nov 2011 Drives: Toyota camry Location: S. Cali Posts: 1,001 Thanks: 98 Thanked 292 Times in 152 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Exhaust baffle/ box structure between cat and resonator? I searched and could not find anything definitive on this forum or elsewhere so forgive me it has been discussed. Pictures that show the underside of the 86 there is a device inline with the exhaust between the cat and resonator. It is a small box with a rounded side. It looks somewhat like a mini branch resonator but it could also be some sort of sound baffle. Does anyone know precisely what this is? I have not seen such a device on any other car. I have seen baffles on the BOSS's side exhausts and I have seen branch resonators on aftermarket systems but none look like this structure. Any Ideas? __________________ Nothing decays like progress, and nothing preserves like neglect.

04-19-2012, 04:53 PM	#5
RRnold 2 wheel member Join Date: Feb 2010 Drives: JZA80, 997.1, Taco Location: SoCal->NorCal Posts: 4,330 Thanks: 1,318 Thanked 938 Times in 480 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Is this what you are asking about? On the headers? http://www.ft86club.com/forums/showt...?t=2636&page=4 __________________

04-19-2012, 09:58 PM	#10
ahausheer Re-member Join Date: Nov 2011 Drives: Toyota camry Location: S. Cali Posts: 1,001 Thanks: 98 Thanked 292 Times in 152 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	^Also, its downstream of the CAT so its not a pre-cat. Yeah it would make sense if it was a resonator I've just never seen one look like that, also, I've never seen 2 resonators so close together. I have a hunch there might be something else to it, perhaps something for the tunners. __________________ Nothing decays like progress, and nothing preserves like neglect.

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04-19-2012, 04:45 PM	#3
R0ME0 ハチロク Join Date: Apr 2012 Drives: Evo X Location: Seattle, WA Posts: 162 Thanks: 33 Thanked 12 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Here's a few pics but I don't see this box that you speak of.

04-19-2012, 04:50 PM	#4
Chenslee Member Join Date: Apr 2012 Drives: 2015 Halo FR-S Location: Greensboro, NC Posts: 67 Thanks: 36 Thanked 22 Times in 15 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It's closer to the engine. You can see the resonator in those pics, it's upstream of that.

04-19-2012, 07:44 PM	#6
old greg Rocket Surgeon Join Date: Apr 2011 Drives: PSM GGA OMG Location: FL Posts: 1,312 Thanks: 10 Thanked 141 Times in 84 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	He's talking about this bit:

04-19-2012, 07:54 PM	#7
GenkiElite Senior Member Join Date: Aug 2010 Drives: 91 Corolla (dd) S14 (daily drifter) Location: Cincinnati Posts: 460 Thanks: 139 Thanked 78 Times in 50 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Looks like a pre-cat. My old 02 Spec V had one. Tt caused a lot of problem for spec owners. The pre-cat woud degrade and bitw were getting sucked back into the head. I had a header on mine so the pre-cat was removed as it was a port of the exhaust manifold. Oh, I just saw the diagram. Not exactly the same as what i had but could still be a pre-cat. Not uncommon for vehicles to have multiple cats...meow

04-19-2012, 08:16 PM	#8
WhiteGDB Senior Member Join Date: Nov 2011 Drives: Civic Si sedan Location: Scottsdale, AZ Posts: 320 Thanks: 5 Thanked 7 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Can't be a pre-cat that far down stream. Probably just another resonator.

04-20-2012, 05:52 AM	#12
Calum That Guy Join Date: Dec 2011 Drives: 2013 asphalt FRS MT Location: Halifax, Nova Scotia Posts: 4,865 Thanks: 5,058 Thanked 2,867 Times in 1,499 Posts Mentioned: 82 Post(s) Tagged: 1 Thread(s)	could be the cause of the torque dip. [/troll]

04-20-2012, 01:45 PM	#14
Calum That Guy Join Date: Dec 2011 Drives: 2013 asphalt FRS MT Location: Halifax, Nova Scotia Posts: 4,865 Thanks: 5,058 Thanked 2,867 Times in 1,499 Posts Mentioned: 82 Post(s) Tagged: 1 Thread(s)	Hey, my post ended the trolling for this thread [/troll]

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