Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
dave@hennessey
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


Reply
 
Thread Tools
Old 01-12-2013, 07:06 AM   #1
Iroc2430
Smoke'm if you can
 
Iroc2430's Avatar
 
Drives: 2010 Camaro 2SS/RS/LS3/M6
Join Date: Nov 2012
Location: Reno, NV
Posts: 713
Upgrade to 3" Exhaust question??

I am thinking of upgrading to a 3" exhaust.

What is the advantage of upgrading from 2 1/2 factory to a 3" exhaust from the headers back? Are you going to see Dyno numbers improve RWHP? Are you going to get a different tone/sound from the exhaust? Or are you just waisting time and $$$?

Thanks
__________________
Texas Speed LT Headers with HF Cats, Borla ATAK Exhaust, MGW Short Throw Shifter, ADM CAI with Scoop, Elite Oil Catch Can, Mishimoto Aluminum Radiator, Pedders XA Coilovers, Mantic Twin 9000 Clutch, PFADT Solid Subframe Bushings, PFADT Front & Rear Sways, PFADT Upper Control Arm Bushing, PFADT Trailing Arms/Tie Rods, Whiteline Adjustable End Links, Whiteline Adjustable Lower Control Arms, Pedders Diff Bushings, Line Lock, ACC Side Markers, ACC Reverse Lights, Custom Tune from Nitrous Express.
Iroc2430 is offline   Reply With Quote
Old 01-12-2013, 07:29 AM   #2
CHEV400
 
CHEV400's Avatar
 
Drives: 2010 2ss
Join Date: Oct 2012
Location: Kernersville, NC
Posts: 45
I have stainless works 1 7/8 to a JBA 3 inch catback and I can say it is a lot more aggressive sounding that any of the other setups that I see come through my dealership. I would think you would see a little whp gain but probably nothing too dramatic to really make it worth while. The only reason I went with a 3 inch is it was on sale.

Just for reference, I have heard the kooks full systems come through and that is what my dealership puts on Camaros if customers buy the performance packages. My car sounds 100X better than that system.
__________________
CHEV400 is offline   Reply With Quote
Old 01-12-2013, 07:32 AM   #3
The Blue Ox

 
The Blue Ox's Avatar
 
Drives: 2010 SS L99 Inferno Orange
Join Date: Apr 2012
Location: Texas Coast
Posts: 1,167
I have 3" on my car and IMO makes the exhaust have a little deeper tone! Not sure about the dyno no's but should help in the upper RPM's over the 2 1/2!
The Blue Ox is offline   Reply With Quote
Old 01-12-2013, 07:53 AM   #4
Iroc2430
Smoke'm if you can
 
Iroc2430's Avatar
 
Drives: 2010 Camaro 2SS/RS/LS3/M6
Join Date: Nov 2012
Location: Reno, NV
Posts: 713
Thanks for the responses, My buddy owns a muffler shop and he said he would put a 3" custom exhaust installed for $200. Thought it was an awesome deal. Just wanted some input from everyone who has this mod. All I need to find now is the 4" tips for a great price. I figured it might change the tone. I'm going to have him gut the HF cats when he removes the factory pipes. I have the Texas Speed LT 1 7/8 headers already.
__________________
Texas Speed LT Headers with HF Cats, Borla ATAK Exhaust, MGW Short Throw Shifter, ADM CAI with Scoop, Elite Oil Catch Can, Mishimoto Aluminum Radiator, Pedders XA Coilovers, Mantic Twin 9000 Clutch, PFADT Solid Subframe Bushings, PFADT Front & Rear Sways, PFADT Upper Control Arm Bushing, PFADT Trailing Arms/Tie Rods, Whiteline Adjustable End Links, Whiteline Adjustable Lower Control Arms, Pedders Diff Bushings, Line Lock, ACC Side Markers, ACC Reverse Lights, Custom Tune from Nitrous Express.
Iroc2430 is offline   Reply With Quote
Old 01-12-2013, 10:19 AM   #5
VADER SS L99


 
VADER SS L99's Avatar
 
Drives: 2013 A6 GT 5.0
Join Date: Nov 2009
Location: Edmond, OK
Posts: 2,909
From a power standpoint you wont gain anything unless your over 450RWHP. The only thing you are going to change is sound below that power level. You might want to ask 3inch owners about the drone as well.
__________________
BLK/BLK 1SS/RS Ordered 11-01-2009 Took delivery 12-22-2009. Heads/cam/converter/bolt ons. SOLD Feb 2015 to fund 6th gen LT1 SS with 8L90E.
VADER SS L99 is offline   Reply With Quote
Old 01-12-2013, 10:22 AM   #6
Iroc2430
Smoke'm if you can
 
Iroc2430's Avatar
 
Drives: 2010 Camaro 2SS/RS/LS3/M6
Join Date: Nov 2012
Location: Reno, NV
Posts: 713
Quote:
Originally Posted by VADER SS L99 View Post
From a power standpoint you wont gain anything unless your over 450RWHP. The only thing you are going to change is sound below that power level. You might want to ask 3inch owners about the drone as well.

Great question!

Never thought about the drone issue.. Thanks.. Any thoughts from who has 3" exhaust on the drone issue?
__________________
Texas Speed LT Headers with HF Cats, Borla ATAK Exhaust, MGW Short Throw Shifter, ADM CAI with Scoop, Elite Oil Catch Can, Mishimoto Aluminum Radiator, Pedders XA Coilovers, Mantic Twin 9000 Clutch, PFADT Solid Subframe Bushings, PFADT Front & Rear Sways, PFADT Upper Control Arm Bushing, PFADT Trailing Arms/Tie Rods, Whiteline Adjustable End Links, Whiteline Adjustable Lower Control Arms, Pedders Diff Bushings, Line Lock, ACC Side Markers, ACC Reverse Lights, Custom Tune from Nitrous Express.
Iroc2430 is offline   Reply With Quote
Old 01-12-2013, 10:59 AM   #7
gnturboray

 
gnturboray's Avatar
 
Drives: SIM 2010 2SS/RS LS3 LPE750
Join Date: Feb 2012
Location: Mckinney, Texas
Posts: 764
I have the LG long tubes and their full 3" system and I love the power and sound and I agree on the over 450whp gains. You will need more supporting mods to see significant gains from just a 3" system. I'm at 650whp with this set up.
gnturboray is offline   Reply With Quote
Old 01-12-2013, 12:16 PM   #8
thahemp
Geek
 
thahemp's Avatar
 
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,343
Quote:
Originally Posted by Iroc2430 View Post
Great question!

Never thought about the drone issue.. Thanks.. Any thoughts from who has 3" exhaust on the drone issue?
Muwahaha. Crazy drone. I don't mind it, but I don't take the car on long trips very often. It's not even just loud drone, you can feel it too. J-pipes are in my future. I have a hard time believing they will get rid of all of it though.

Like the first response, this JBA 3" is the most aggressive sounding system I have had the opportunity to hear. It sounds downright mean. This the the video (not my car) that I always post for people to hear the system. It's a great capture of the exhaust the way it really sounds.

__________________
01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
x = ~x
thahemp is offline   Reply With Quote
Old 01-12-2013, 01:55 PM   #9
The Blue Ox

 
The Blue Ox's Avatar
 
Drives: 2010 SS L99 Inferno Orange
Join Date: Apr 2012
Location: Texas Coast
Posts: 1,167
Quote:
Originally Posted by Iroc2430 View Post
Great question!

Never thought about the drone issue.. Thanks.. Any thoughts from who has 3" exhaust on the drone issue?
I have Kooks long tubes with HFC's hooked up to Billy Boat 3" and have absolutely no drone!
The Blue Ox is offline   Reply With Quote
Old 01-12-2013, 03:23 PM   #10
Apex Motorsports
 
Apex Motorsports's Avatar
 
Drives: 2000 Camaro SS
Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
You will not see any performance benefit to 3 inch exhaust until you start getting into forced induction and flowing a lot of air. You will get a deeper tone with 3 inch exhaust though. Drone completely depends on the system. The Stainless Works Retro Chambered cat back is a 3 inch system and drone free.
Apex Motorsports is offline   Reply With Quote
Old 01-12-2013, 03:35 PM   #11
thahemp
Geek
 
thahemp's Avatar
 
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,343
Quote:
Originally Posted by Apex Chase View Post
You will not see any performance benefit to 3 inch exhaust until you start getting into forced induction and flowing a lot of air. You will get a deeper tone with 3 inch exhaust though. Drone completely depends on the system. The Stainless Works Retro Chambered cat back is a 3 inch system and drone free.
Might be worth it if you have a wife!
__________________
01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
x = ~x
thahemp is offline   Reply With Quote
Old 01-12-2013, 06:37 PM   #12
MarylandSpeed
Account Suspended
 
Drives: 2012 ZL1 & 2010 2SS/RS
Join Date: Jul 2009
Location: Maryland
Posts: 3,378
A performance exhaust is all about exhaust velocity. The faster the exhaust moves, the more efficiantly your engine breathes and makes power. And exhaust that is too large, like a 3" exhaust on a stockish Camaro will not see any gain, and may lose some power because the exhaust is not as pressurized.

Also on a side note, I have found 3" exhausts tend to have the highest chance of droning because for lack of a more technical term, the larger diameter pipe allows the exhaust sound frequencies to vibrate more.
MarylandSpeed is offline   Reply With Quote
Old 01-15-2013, 09:17 PM   #13
thahemp
Geek
 
thahemp's Avatar
 
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,343
Quote:
Originally Posted by MarylandSpeed View Post
A performance exhaust is all about exhaust velocity. The faster the exhaust moves, the more efficiantly your engine breathes and makes power. And exhaust that is too large, like a 3" exhaust on a stockish Camaro will not see any gain, and may lose some power because the exhaust is not as pressurized.

Also on a side note, I have found 3" exhausts tend to have the highest chance of droning because for lack of a more technical term, the larger diameter pipe allows the exhaust sound frequencies to vibrate more.
I'll take this one. Here are the wavelengths in feet for 1 KHz and 2 KHz respectively: 1.129 & 0.56.

To create a standing wave, or constructive interference, you need to divide a full wavelength in a way that adds up as it reflects. For example a wavelength of .5 feet would be a 3" x 2 at around 2k rpm. That should be a familiar rpm range for drone sufferers. Whereas a 2.5 inch wavelength doesn't divide into overlapping waves until higher in the rpm band when the car is being driven harder anyways.

4k is 0.28 feet, so that would be another hotspot for a 3".
__________________
01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
x = ~x
thahemp 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 01:18 PM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.