Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
BeckyD@RodgersChevrolet
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons

Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

Reply
 
Thread Tools
Old 08-08-2013, 09:21 PM   #1
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Help identify my exhaust annoyance!

Something is causing an annoying sound and I'm pretty sure I know what it is. I'd like some opinions to see if I'm on the right track or not. I've tried to cut down the video's to just the sound I'm talking about. Please take a listen and let me know what you think it may be.

2011 2SS/RS AUTO w/Dynatech headers, no cat's, stock cat-back w/ muffler delete. None of the exhaust is hitting anything, I've triple checked that. All bolts and fittings are tight and then retightened after a few days. Car is also tuned so no AFM/DOD.

It's best when heard/watched with some sort of headset/earbuds.

[youtube]O9LDyyXpk7w[/youtube]

[youtube]tueHIW3YMgo[/youtube]

Thanks!
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-08-2013, 09:28 PM   #2
45thAnniversary2SS

 
45thAnniversary2SS's Avatar
 
Drives: 2012 45th Anniversary 2SS LS3
Join Date: Feb 2012
Location: Charlotte, NC
Posts: 2,199
__________________
45thAnniversary2SS is online now   Reply With Quote
Old 08-08-2013, 09:30 PM   #3
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Embedded, sorry.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-08-2013, 09:30 PM   #4
45thAnniversary2SS

 
45thAnniversary2SS's Avatar
 
Drives: 2012 45th Anniversary 2SS LS3
Join Date: Feb 2012
Location: Charlotte, NC
Posts: 2,199
Headers with no cats to stock exhaust right?
__________________
45thAnniversary2SS is online now   Reply With Quote
Old 08-08-2013, 09:32 PM   #5
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Quote:
Originally Posted by 45thAnniversary2SS View Post
Headers with no cats to stock exhaust right?
Yep, stock "H" pipe :(
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-08-2013, 09:32 PM   #6
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Or whatever it is!
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-08-2013, 09:51 PM   #7
45thAnniversary2SS

 
45thAnniversary2SS's Avatar
 
Drives: 2012 45th Anniversary 2SS LS3
Join Date: Feb 2012
Location: Charlotte, NC
Posts: 2,199
I would take a look at the tunnel brace to make sure its not making contact with pipes. Also may want to check heat shield to make sure its not touching anywhere.
__________________
45thAnniversary2SS is online now   Reply With Quote
Old 08-08-2013, 09:59 PM   #8
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
I've shimmed the tunnel brace and didn't notice any shielding hitting anything but I suppose it's a possibility.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-08-2013, 10:00 PM   #9
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
In the car it sounds like puffing air. I'm thinking its the H pipe but not positive just yet.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-08-2013, 11:30 PM   #10
62nalide


 
62nalide's Avatar
 
Drives: 2013 SS
Join Date: May 2013
Location: DFW
Posts: 2,261
Exhaust leak maybe?
__________________
VVT cam equipped.
N/A 6.2L 7.20s in the 1/8!
11.26 @ 124.11 mph in the 1/4
62nalide is offline   Reply With Quote
Old 08-09-2013, 04:07 AM   #11
SS PANTHER

 
SS PANTHER's Avatar
 
Drives: 2013 SS Camaro Convertible
Join Date: May 2013
Location: SoCal
Posts: 1,093
Could it be the exhaust butterfly valves?
http://www.camaro5.com/forums/showthread.php?t=275303
SS PANTHER is offline   Reply With Quote
Old 08-09-2013, 05:58 AM   #12
cam62

 
Drives: 2012 IBM Vert 2SS/rs
Join Date: Jul 2011
Location: Tampa, FL
Posts: 1,256
Quote:
Originally Posted by SS PANTHER View Post
Could it be the exhaust butterfly valves?
http://www.camaro5.com/forums/showthread.php?t=275303
Don't know if the op has a convertible with the L99. As far as I know these are the only camaros with the butterfly valves.

I hate that sound and I hear it much more often than the tsb says it is heard.

AFM doesn't belong on an ss :(.

Those will be deleted from mine as soon as I can afford new catback.
__________________
rx catch can;vmax ported throttle body;bowtie delete;SLP SS emblem;CAI cold air intake
cam62 is offline   Reply With Quote
Old 08-09-2013, 06:57 AM   #13
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Not a convertible. If it's an exhaust leak it has to be big but I guess anything is possible. I just can't imagine where it could be coming from at this point, I've triple checked all connections. I'm leaning towards that thing underneath the car right at the tunnel brace on the stock exhaust.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-09-2013, 08:02 AM   #14
axis
Search Ninja
 
axis's Avatar
 
Drives: 2010 Black 2SS/RS A6
Join Date: Oct 2009
Location: Central Ark
Posts: 7,185
Doesn't sound like it's hitting anything. That would be more of a metal on metal knocking noise. There would have to be something VERY loose to do that and you already said it's all tight. Can you replicate it with just revving the motor or do you need to be driving? Did it just start out of the blue or did you do anything before it started?
__________________
2010 Black 2SS/RS A6
Halltech CF 102 fed
GPI modded intake manifold
Bo (knows) White ported TB
Kooks LT's/ Dynomax VT
Pfadted (springs/sways)
Dyno tuned by Rhino and GPI

I once parallel parked a train.
axis is offline   Reply With Quote
Old 08-09-2013, 08:09 AM   #15
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
It's done it since the install. To me it sounds like the exhaust pulses coming from the engine are being magnified. This is why I'm thinking its the stock H pipe (or whatever you want to call that thing). I'm about ready to take it to a muffler shop and have them cut that thing out.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-09-2013, 08:11 AM   #16
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
I'll check today and see at what RPM range it does it. It doesn't do it all the time.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-09-2013, 10:20 AM   #17
thahemp
Geek
 
thahemp's Avatar
 
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,175
Sounds normal to me. I can duplicate that sound in my car by going 40 MPH in 6th and giving it some gas. You can hear the air rushing through your headers when the exhaust isn't in the loud RPM range.
__________________
01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
x = ~x
thahemp is online now   Reply With Quote
Old 08-09-2013, 10:31 AM   #18
willhe64

 
willhe64's Avatar
 
Drives: 2012 45th Vert, 2011 4x4, 9sec Vega
Join Date: Mar 2012
Location: Canada
Posts: 1,903
Get it up on a hoist and you'll figure it out.
__________________
I feel it only fair to warn you, I have a black belt in CAPS LOCK.
willhe64 is offline   Reply With Quote
Old 08-09-2013, 12:10 PM   #19
thahemp
Geek
 
thahemp's Avatar
 
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,175
Unless there's nothing wrong with it .
__________________
01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
x = ~x
thahemp is online now   Reply With Quote
Old 08-09-2013, 01:25 PM   #20
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Quote:
Originally Posted by thahemp View Post
Unless there's nothing wrong with it .
This^. I think you may be on to something! Did a data log and Ted@JRE says it looks good. I think he would see it if it were leaking.
I still think it's that stock piece of the exhaust. I think its exaggerating normal sounds. I may just order an x-pipe and have someone weld it in, or just get used to it.
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
Old 08-09-2013, 02:26 PM   #21
thahemp
Geek
 
thahemp's Avatar
 
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,175
I have an h-pipe in mine too. I don't know that it causes the sound, but i have one fwiw. I like the sound. Sounds like power being made!
__________________
01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
x = ~x
thahemp is online now   Reply With Quote
Old 08-09-2013, 06:41 PM   #22
HardrockSS
Drive Fast Take Chances
 
HardrockSS's Avatar
 
Drives: 2012 45th anniversary SS
Join Date: Apr 2012
Location: cape cod
Posts: 309
Turn the music up
__________________
2012 45th Ls3 M6 Mods:Pfadt Tri-y headers Solo Mach X 20%tint, K&N Intake, ,ambient lighting,custom bow ties,3.91 gears ,suspension upgrades.415 RWHP tuned@Slowhawk Inc.
HardrockSS is offline   Reply With Quote
Old 08-09-2013, 06:46 PM   #23
epstein
Account Suspended
 
Drives: SS/RS
Join Date: May 2010
Location: Transplanted from NYC..(ret. NYPD).Now in CT
Posts: 907
Send a message via AIM to epstein
NORMAL
epstein is offline   Reply With Quote
Old 08-09-2013, 06:51 PM   #24
axis
Search Ninja
 
axis's Avatar
 
Drives: 2010 Black 2SS/RS A6
Join Date: Oct 2009
Location: Central Ark
Posts: 7,185
Quote:
Originally Posted by OmniCamaro View Post
This^. I think you may be on to something! Did a data log and Ted@JRE says it looks good. I think he would see it if it were leaking.
I still think it's that stock piece of the exhaust. I think its exaggerating normal sounds. I may just order an x-pipe and have someone weld it in, or just get used to it.
Datalogging won't detect an exhaust leak unless it's leaking before the O2 sensors. That being said, it doesn't sound like an exhaust leak.
__________________
2010 Black 2SS/RS A6
Halltech CF 102 fed
GPI modded intake manifold
Bo (knows) White ported TB
Kooks LT's/ Dynomax VT
Pfadted (springs/sways)
Dyno tuned by Rhino and GPI

I once parallel parked a train.
axis is offline   Reply With Quote
Old 08-09-2013, 07:00 PM   #25
OmniCamaro
US Veteran
 
OmniCamaro's Avatar
 
Drives: 2011 Silver Ice Metallic 2SS/RS A6
Join Date: Jan 2011
Location: Bossier City, La
Posts: 1,047
Thanks everyone for the help!
__________________
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)
OmniCamaro is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.