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Exhaust Discussions regarding headers, cutouts, catalytic converters, mufflers, tips, etc...

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  #1 (permalink)  
Old 07-02-2010, 03:08 AM
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Homemade muffler/resonator

I made a full custom exhaust for my car, here is a link with details, pics and video. New custom exhaust!

I love the sound at idle and up until about 2500 rpm, but anything higher that that it sounds like ****. I am wanting to make a muffler because I want to keep it all custom. I know how I am going to do it, cut out a piece of the existing pipe about 2-3ft long, drill holes all over it like crazy, then put it inside a bigger pipe, weld up the ends and weld it back in place. Simple. The question I have is about the packing. I have been doing alot of research about mufflers lately and I am debating on what to pack it with, or to pack it at all. My goal is to reduce/get rid of the crappy rasp at high rpms. I have seen mufflers that are packed with fiberglass(glasspack). The problem is it does not last very long. Some packed with steel wool, and stainless steel wool, again does not last very long. I have also found some that are packed with a ceramic material, that will last practically forever. I would like to use the ceramic stuff, but I'd have to order it online. And I read somewhere that a guy went for one ride on his bike after repacking the muffler with the ceramic stuff, all of the fiber blew out. I am really leaning toward not packing it with anything. It would not absorb near as much sound, but would reduce some. Anyone have any thoughts/ideas/experience. Any comment would be apperciated.

Thanks, Tommy
__________________
97 GTP
8.5 MSD wires
Speedbuilt FWI w/ 9"K&N
Custom exhaust
SLP headers
Intense: Stage 1x cam package, 3.4/3.2 pulley, PCM, 160stat
9.5:1 Diamond coated pistons, bored .010" over
Oversized SI valves
Custom ported heads
12.92@106mph


..."As I lay rubber down the street,
I pray for traction I can keep,
but if I spin and begin to slide,
I pray dear Lord to protect my ride"! Amen.

Last edited by Scuba T; 07-02-2010 at 03:12 AM.
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  #2 (permalink)  
Old 07-02-2010, 09:46 AM
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Got the factory muffler for a V6? Take it apart and study what GM had done.

Else don't know, very cool to try! Kudos!
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Old 07-02-2010, 09:55 AM
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Unless you spend big money on a high end muffler that rasp will be there, it's a v6 thing. If you're gonna try and make your own muffler why not make it serviceable? Make it so it's easily removed from the car and try something like threading the pipes so that once you take the muffler out you can spin like a cap off one end and repack it one needed without much hassle. If you do something like that you could also play with different packing materials and see if there's a difference and what you like better.
Good luck!
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Old 07-02-2010, 10:57 AM
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Quote:
Originally Posted by 98Park View Post
Unless you spend big money on a high end muffler that rasp will be there, it's a v6 thing. If you're gonna try and make your own muffler why not make it serviceable? Make it so it's easily removed from the car and try something like threading the pipes so that once you take the muffler out you can spin like a cap off one end and repack it one needed without much hassle. If you do something like that you could also play with different packing materials and see if there's a difference and what you like better.
Good luck!
Ist not a v6 thing its the unequal exhaust system we have, i would love to see ture duals with a x pipe or balance pipe
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Old 07-02-2010, 10:59 AM
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So what happens to the packing material? Does it burn up? It shouldn't ever be able to get into the exhaust stream.

The Walker Dynomax 17749 is a great V8 muffler, quiet and low cost, the inside is so simple, it flows almost as good as straight pipe but it is a very quiet muffler.

Exhaust is a good article on mufflers and a 11 sec street car....



Quote:
Originally Posted by Scuba T View Post
I made a full custom exhaust for my car, here is a link with details, pics and video. New custom exhaust!

I love the sound at idle and up until about 2500 rpm, but anything higher that that it sounds like ****. I am wanting to make a muffler because I want to keep it all custom. I know how I am going to do it, cut out a piece of the existing pipe about 2-3ft long, drill holes all over it like crazy, then put it inside a bigger pipe, weld up the ends and weld it back in place. Simple. The question I have is about the packing. I have been doing alot of research about mufflers lately and I am debating on what to pack it with, or to pack it at all. My goal is to reduce/get rid of the crappy rasp at high rpms. I have seen mufflers that are packed with fiberglass(glasspack). The problem is it does not last very long. Some packed with steel wool, and stainless steel wool, again does not last very long. I have also found some that are packed with a ceramic material, that will last practically forever. I would like to use the ceramic stuff, but I'd have to order it online. And I read somewhere that a guy went for one ride on his bike after repacking the muffler with the ceramic stuff, all of the fiber blew out. I am really leaning toward not packing it with anything. It would not absorb near as much sound, but would reduce some. Anyone have any thoughts/ideas/experience. Any comment would be apperciated.

Thanks, Tommy
__________________
Cars built by engineers, rather than spreadsheets, tend to go down in history... Tiff Needell

2000 Buick Park Ave Ultra, Supercharged 3800 L67, PCM tuned by me with TunerCat2 and Moates Roadrunner PCM for realtime tuning
And now supporting with EFILive!!
[U]



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Old 07-02-2010, 11:01 AM
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I always wanted to do that, take the front pipe on the 3800 and unjoin it from the merged back manifold, and run dual pipes down, dual cats and dual mufflers. Add a second O2 sensor and turn on dual back fuel control and make it run really good..

Quote:
Originally Posted by 91parkave View Post
Ist not a v6 thing its the unequal exhaust system we have, i would love to see ture duals with a x pipe or balance pipe
__________________
Cars built by engineers, rather than spreadsheets, tend to go down in history... Tiff Needell

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And now supporting with EFILive!!
[U]



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  #7 (permalink)  
Old 07-02-2010, 10:05 PM
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Quote:
Originally Posted by 98Park View Post
Unless you spend big money on a high end muffler that rasp will be there, it's a v6 thing. If you're gonna try and make your own muffler why not make it serviceable? Make it so it's easily removed from the car and try something like threading the pipes so that once you take the muffler out you can spin like a cap off one end and repack it one needed without much hassle. If you do something like that you could also play with different packing materials and see if there's a difference and what you like better.
Good luck!

Thats a hell of an idea. Thanks.
I know there is no way to get rid of the rasp completely.
__________________
97 GTP
8.5 MSD wires
Speedbuilt FWI w/ 9"K&N
Custom exhaust
SLP headers
Intense: Stage 1x cam package, 3.4/3.2 pulley, PCM, 160stat
9.5:1 Diamond coated pistons, bored .010" over
Oversized SI valves
Custom ported heads
12.92@106mph


..."As I lay rubber down the street,
I pray for traction I can keep,
but if I spin and begin to slide,
I pray dear Lord to protect my ride"! Amen.
Reply With Quote
  #8 (permalink)  
Old 07-02-2010, 10:56 PM
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Quote:
Originally Posted by n0dih View Post
So what happens to the packing material? Does it burn up? It shouldn't ever be able to get into the exhaust stream.

The Walker Dynomax 17749 is a great V8 muffler, quiet and low cost, the inside is so simple, it flows almost as good as straight pipe but it is a very quiet muffler.

Exhaust is a good article on mufflers and a 11 sec street car....
Thomas thanks for the article, it was very interesting.

Good question about the packing material. I have read alot about people saying that the steel wool catches fire really easily. It does, but it need oxygen to do that, and there is not much, if any, oxygen coming through the exhaust. I think it eventually just absorb so much exhaust fumes it can't take anymore. Haha, sorry for the extream level of technicality.
__________________
97 GTP
8.5 MSD wires
Speedbuilt FWI w/ 9"K&N
Custom exhaust
SLP headers
Intense: Stage 1x cam package, 3.4/3.2 pulley, PCM, 160stat
9.5:1 Diamond coated pistons, bored .010" over
Oversized SI valves
Custom ported heads
12.92@106mph


..."As I lay rubber down the street,
I pray for traction I can keep,
but if I spin and begin to slide,
I pray dear Lord to protect my ride"! Amen.
Reply With Quote
  #9 (permalink)  
Old 07-04-2010, 04:35 PM
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Quote:
Originally Posted by Scuba T View Post
Thats a hell of an idea. Thanks.
I know there is no way to get rid of the rasp completely.
Let us know if you try it, i'd be interested to see how it works
__________________

http://www.cardomain.com/ride/2879377
3.2" MPS/4" Intense FWI/1.9 Rockers/L92 springs and retainers/SSAC Headers/Cat delete/3" from DP to TPs/Super 44's/Flowmaster res/AP104's/180* stat/3.5" tensionor/V+/Dynamat FKEK
I love being blown!
-----------------------------
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One died for your soul, the other for your freedom.
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