Axle-back vs Cat-back? - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

The SwiftChancelor · 06-05-2012, 08:34 PM

Can some one post up a pic of the L99 resonators, now removing these for an x-pipe should surely free up some of the flow.

Birm · 06-05-2012, 08:45 PM

Quote:

Originally Posted by Avenging Orange

Nope......and not mine

Umm yes you do..if you have an ls3 you have a resonator. You had an h pipe and a resonator. They didn't forget yours and put em on everyone else's.......

jesserayjames · 06-05-2012, 08:50 PM

Quote:

Originally Posted by mikeSS

its the idea of a cat back that i like. you have to cut and weld if you dont go cat back route, and want the cat back performance. also i feel they sound better.

Welding is not true, I just installed a Flowmaster outlaw axle back and no welding..........

mexiken · 06-05-2012, 09:23 PM

Quote:

Originally Posted by Birm

Umm yes you do..if you have an ls3 you have a resonator. You had an h pipe and a resonator. They didn't forget yours and put em on everyone else's.......

Truth, just saw the setup today when they were installing my Super 44's

Avenging Orange · 06-05-2012, 10:15 PM

Quote:

Originally Posted by Birm

Umm yes you do..if you have an ls3 you have a resonator. You had an h pipe and a resonator. They didn't forget yours and put em on everyone else's.......

Umm, never said I didnt have an H pipe

BlaqWhole · 06-06-2012, 03:15 AM

Quote:

Originally Posted by Avenging Orange

Bah! Tomato tamato. If you call those straight through nothing in the way thingys resonators........then I guess the we all better get rid of those restictive fuel filters.

Just because there is nothing inside them does not mean they aren't restrictive. The resonators have a slightly larger diameter than the rest of the exhaust. Imagine air going through a 2.5" tube at a certain velocity. As the air travels it will retain its speed up to a certain distance if the tubing stays the same size and the engine maintains the same RPM. So the air is going through the tube and at some point the diameter in the tube increases and then returns to normal. This increase in diameter would cause a decrease in velocity of the volume of air traveling through at that point. That sudden decrease in speed would further restrict the air flow all the way back. Then when the tube returns to 2.5" diameter the volume of air that was slowed will have to push the air in front of it and it will have to rely on the air behind it to push itself out thus causing more restriction and slowing of the volume of air in front of the diameter increase. This all decreases engine efficiency and power. Which is why aftermarket exhausts do increase performance. Not to mention that aftermarket exhausts are usually more consistent in diameter and have smoother bends...all of which relates to better performance. How much performance varies.

Remember, these resonators were placed on these cars for a specific reason. GM didn't just put them there for the heck of it.

Cody6.2 · 06-07-2012, 05:38 PM

Quote:

Originally Posted by BlaqWhole

Just because there is nothing inside them does not mean they aren't restrictive. The resonators have a slightly larger diameter than the rest of the exhaust. Imagine air going through a 2.5" tube at a certain velocity. As the air travels it will retain its speed up to a certain distance if the tubing stays the same size and the engine maintains the same RPM. So the air is going through the tube and at some point the diameter in the tube increases and then returns to normal. This increase in diameter would cause a decrease in velocity of the volume of air traveling through at that point. That sudden decrease in speed would further restrict the air flow all the way back. Then when the tube returns to 2.5" diameter the volume of air that was slowed will have to push the air in front of it and it will have to rely on the air behind it to push itself out thus causing more restriction and slowing of the volume of air in front of the diameter increase. This all decreases engine efficiency and power. Which is why aftermarket exhausts do increase performance. Not to mention that aftermarket exhausts are usually more consistent in diameter and have smoother bends...all of which relates to better performance. How much performance varies.

Remember, these resonators were placed on these cars for a specific reason. GM didn't just put them there for the heck of it.

No.

BluegraSS · 06-07-2012, 06:29 PM

L99 Resonator

Bottom View

Top view

BlaqWhole · 06-07-2012, 07:18 PM

Quote:

Originally Posted by Cody6.2

No.

I'm all ears then...

Birm · 06-07-2012, 07:35 PM

Quote:

Originally Posted by Avenging Orange

Umm, never said I didnt have an H pipe

Nope you said you didn't have a resonator , therefore you either: removed it, bought it used and the previous owner removed it or the most likely scenario, YOU DON'T KNOW WTF YOU'RE TALKING ABOUT......

Chances are its the latter.

Cody6.2 · 06-08-2012, 10:06 AM

Quote:

Originally Posted by BlaqWhole

I'm all ears then...

Take a look inside the factory resonators, that is all.

BlaqWhole · 06-08-2012, 11:53 AM

Quote:

Originally Posted by Cody6.2

Take a look inside the factory resonators, that is all.

An engine is a pump, and the air it pumps has to flow through exhaust tubes. The flow can be altered based on the size and shape of the tubing. Any change in size or shape that affects flow can also affect engine performance. Resonators are put in place to control the sound of the exhaust and I believe drone, from what I understand. In doing so it also hinders performance.

Now are you suggesting that the diameter on the inside of the exhaust resonator of the LS3 is the same as the rest of the exhaust piping? I haven't looked inside it or cut one open. And being as how I don't have access to one I have no way of looking inside it. But again, I'm all ears...

Cody6.2 · 06-08-2012, 12:33 PM

Quote:

Originally Posted by BlaqWhole

An engine is a pump, and the air it pumps has to flow through exhaust tubes. The flow can be altered based on the size and shape of the tubing. Any change in size or shape that affects flow can also affect engine performance. Resonators are put in place to control the sound of the exhaust and I believe drone, from what I understand. In doing so it also hinders performance.

Now are you suggesting that the diameter on the inside of the exhaust resonator of the LS3 is the same as the rest of the exhaust piping? I haven't looked inside it or cut one open. And being as how I don't have access to one I have no way of looking inside it. But again, I'm all ears...

First of quit talking like were stupid, second quit writing book length responses when a single paragraph will do. There is a difference between flow direction and sound deflection/absobtion/cancelation and one may not affect the other. Continuing to say that a perf. tube muffler or resonator is restrictive is silly.

HumanWiki · 06-08-2012, 01:52 PM

Maybe I've just missed a lot, having dealt with the parts of my exhaust I care about.. but.. I thought it had been decided that mid-sections on the LS3 Camaros had very little if any power held up in them and that even the OE Mufflers weren't all that restrictive and pretty much granted you different sound and less weight.

When did that change? I thought it was headers + cats that gave you the power changes, followed by stepping up the pipe size (for big builds)

06-05-2012, 08:34 PM	#29
The SwiftChancelor Drives: SGM, 2011 2SS/RS, L99 Join Date: Oct 2011 Location: Wildcat Country Posts: 593 View My Garage	Can some one post up a pic of the L99 resonators, now removing these for an x-pipe should surely free up some of the flow. __________________ K&N air intake, Solo w/Jpipes axleback, SP 1 7/8 LT headers

06-07-2012, 06:29 PM	#36
BluegraSS Drives: 2012 Victory Red SS/RS Join Date: May 2012 Location: Carlisle, KY Posts: 42	L99 Resonator Bottom View Top view

06-08-2012, 01:52 PM	#42
HumanWiki Drives: Car Join Date: Jun 2010 Location: Place Posts: 3,361	Maybe I've just missed a lot, having dealt with the parts of my exhaust I care about.. but.. I thought it had been decided that mid-sections on the LS3 Camaros had very little if any power held up in them and that even the OE Mufflers weren't all that restrictive and pretty much granted you different sound and less weight. When did that change? I thought it was headers + cats that gave you the power changes, followed by stepping up the pipe size (for big builds)