So we dissected an L99 resonator today.... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jpgoins · 04-07-2010, 03:21 PM

I am a GM ASEP instructor at San Jacinto College as well as a Camaro fanatic (unfortunately, my dad's the one that owns it). During Engine Performance class we were talking about Active Displacement. My dad had replaced his resonator on his 2SS (L99) with an x-pipe and was stunned at the discoloration of the resonator and the improvement in performance after replacing it. BTW, theres about 6K miles on the resonator. Our welding department has a very talented craftsman, Hector, who did the dissection for us. I was curious as to the design and why there would be so much heat buildup. Here's the pics.....

RedJewel2SS · 04-07-2010, 03:25 PM

nicely done... now i know what i got rid of!

duffmobile · 04-07-2010, 03:29 PM

thats an ugly SOB

Robert91RS · 04-07-2010, 04:27 PM

That looks like it would act more as a muffler than the two hollow trash cans behind the rear fascia.

2010 SSRS · 04-07-2010, 04:29 PM

Boat anchor

Jekyll-N-Hyde · 04-07-2010, 04:38 PM

RESTRICTIVEEEEEEEEEEEEEEEEEEEEEEEEEEE

And yes a Boat Anchor

jpgoins · 04-07-2010, 08:40 PM

@RedJewel2SS....love the heritage grill!

jordan 572 · 04-07-2010, 08:41 PM

What do these things do that only the l99 need them and not the ls3

JHart · 04-07-2010, 08:53 PM

keeps the AFM sound from being so pronounced

ron10 · 04-07-2010, 09:00 PM

i don't want this on my car.

ZYA_LTR · 04-08-2010, 02:17 PM

Just shows you that with a few select mods, the L99 would be closer in power to an LS3..Would be interesting to see a swap on an L99 car where they just change the exhaust over to an LS3 setup to see how many lost ponies in the exhaust...that resonator has got to account for quite a few dead horses.

Sidewayz_510 · 04-09-2010, 04:47 AM

Well done thanks for sharing

SGOS252382 · 04-09-2010, 06:39 AM

Quote:

Originally Posted by ZYA_LTR

Just shows you that with a few select mods, the L99 would be closer in power to an LS3..Would be interesting to see a swap on an L99 car where they just change the exhaust over to an LS3 setup to see how many lost ponies in the exhaust...that resonator has got to account for quite a few dead horses.

The L99 also uses different mufflers. They look the same on the outside, but they are very different on the inside. There are some pictures floating around the forum of the inside of the L99 mufflers. The LS3 muffers are a straight through muffler. The L99 mufflers have this crazy piping on the inside to help reduce AFM noises.

IPS Brandon · 04-09-2010, 07:25 AM

Quote:

Originally Posted by SGOS252382

The L99 also uses different mufflers. They look the same on the outside, but they are very different on the inside. There are some pictures floating around the forum of the inside of the L99 mufflers. The LS3 muffers are a straight through muffler. The L99 mufflers have this crazy piping on the inside to help reduce AFM noises.

GM engineered this for those reasons, because logically peoples tonal expectations would be way off if they used a standard muffler system once AFM kicked in. Perception is everything, but I must say that like other members, its a boat anchor and get an aftermarket unit then tune out AFM.

Very neat

Regards

04-07-2010, 03:21 PM	#1
jpgoins Drives: 2008 Malibu LTZ 3.6/6A Join Date: Apr 2009 Location: Houston, Tx Posts: 26	So we dissected an L99 resonator today.... I am a GM ASEP instructor at San Jacinto College as well as a Camaro fanatic (unfortunately, my dad's the one that owns it). During Engine Performance class we were talking about Active Displacement. My dad had replaced his resonator on his 2SS (L99) with an x-pipe and was stunned at the discoloration of the resonator and the improvement in performance after replacing it. BTW, theres about 6K miles on the resonator. Our welding department has a very talented craftsman, Hector, who did the dissection for us. I was curious as to the design and why there would be so much heat buildup. Here's the pics..... Attached Images

04-07-2010, 03:25 PM	#2
RedJewel2SS 12.23s@113mph Drives: 2SS/RS, A6, just a few bolt ons Join Date: Jul 2009 Location: Houston, TX Posts: 1,197	nicely done... now i know what i got rid of! __________________ RIP Cammie 7/15/2009 - 4/1/2011

04-07-2010, 04:29 PM	#5
2010 SSRS Drives: 3 V8 Camaros Join Date: May 2009 Location: The Ocean State Posts: 111,187 View My Garage	Boat anchor __________________ Jannetty Racing JRE Street Package

04-07-2010, 08:53 PM	#9
JHart I haz camaro again :) Drives: 2010 Chevrolet Camaro 1SS Join Date: Mar 2009 Location: Union, South Carolina Posts: 660	keeps the AFM sound from being so pronounced __________________ 2010 Camaro 1SS(back in a camaro again, yessssss!) 2010 silverado z71 ccsb(sold, old dd) 2010 camaro1ss(sold, missed, will have another someday)

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04-07-2010, 03:29 PM	#3
duffmobile Drives: 2010 Camaro 2SS/RS - IOM/IOM Join Date: Mar 2009 Location: Frankfort, IL Posts: 374	thats an ugly SOB

04-07-2010, 04:27 PM	#4
Robert91RS Drives: Everywhere Join Date: Jun 2008 Location: TX Posts: 852	That looks like it would act more as a muffler than the two hollow trash cans behind the rear fascia.

04-07-2010, 04:38 PM	#6
Jekyll-N-Hyde I put the FU back in FUN Drives: 1969 SS 396 , 2010 Camaro SS Join Date: Jun 2009 Location: Between Weatherford and Azle TX hway730 Posts: 2,129	RESTRICTIVEEEEEEEEEEEEEEEEEEEEEEEEEEE And yes a Boat Anchor

04-07-2010, 08:40 PM	#7
jpgoins Drives: 2008 Malibu LTZ 3.6/6A Join Date: Apr 2009 Location: Houston, Tx Posts: 26	@RedJewel2SS....love the heritage grill!

04-07-2010, 08:41 PM	#8
jordan 572 Drives: none Join Date: Jul 2008 Location: MN Posts: 1,720 View My Garage	What do these things do that only the l99 need them and not the ls3

04-07-2010, 09:00 PM	#10
ron10 Drives: 2010 2SS IOM L99 Join Date: Jan 2010 Location: LOUISVILLE,KY.. Posts: 7,545	i don't want this on my car.

04-08-2010, 02:17 PM	#11
ZYA_LTR Drives: Waiting to be ordered Join Date: Jun 2009 Location: Detroit, Michigan Posts: 37	Just shows you that with a few select mods, the L99 would be closer in power to an LS3..Would be interesting to see a swap on an L99 car where they just change the exhaust over to an LS3 setup to see how many lost ponies in the exhaust...that resonator has got to account for quite a few dead horses.

04-09-2010, 04:47 AM	#12
Sidewayz_510 Drives: 2010 BLK SS/RS & 2005 Range Rover Join Date: Apr 2009 Location: EAST BAY AREA, CA Posts: 46	Well done thanks for sharing