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  #1  
Old 03-14-2016, 12:54 PM
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exhaust troubleshoot

I am stuck messing with my exhaust too much. here is the order of my additions to my exhaust setup

borla S leaving everything else stock
custom 3" x pipe with suitcase muffler delete ending up with drone (see next)
j pipes added to reduce drone at rpm 1500-2000, fixed all drone
kooks LT headers 1 7/8 with green cats, drone is back (see next)
now i have drone 2000-2500 and its baaadddd

my question is should I just buy a kooks cat back so i have a full kooks system and chance still having a drone problem. my main issue is not daily driving around town but any road trip when im going 70-75 mph my rpms sit exactly at 2100 and any hills or anything creates hella drone. only time drone goes away is going down a hill lol.


i do like to do road trips so im looking to reduce all drone. it was great with my j-pipes before i did the headers and cats. now i have new drone rpm.

HALP!

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  #2  
Old 03-14-2016, 03:31 PM
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Re: exhaust troubleshoot

Quote:
Originally Posted by firstjeeplast View Post
I am stuck messing with my exhaust too much. here is the order of my additions to my exhaust setup

borla S leaving everything else stock
custom 3" x pipe with suitcase muffler delete ending up with drone (see next)
j pipes added to reduce drone at rpm 1500-2000, fixed all drone
kooks LT headers 1 7/8 with green cats, drone is back (see next)
now i have drone 2000-2500 and its baaadddd

my question is should I just buy a kooks cat back so i have a full kooks system and chance still having a drone problem. my main issue is not daily driving around town but any road trip when im going 70-75 mph my rpms sit exactly at 2100 and any hills or anything creates hella drone. only time drone goes away is going down a hill lol.


i do like to do road trips so im looking to reduce all drone. it was great with my j-pipes before i did the headers and cats. now i have new drone rpm.

HALP!
Why not modify the jpipe length to deal with the drone frequency? It seems to me that you moved the drone frequency a little so you need to change the length.


Also...any photos of your Jpipes or do you remember the length of the Jpipe?
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  #3  
Old 03-14-2016, 08:00 PM
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Re: exhaust troubleshoot

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Originally Posted by Bustanuddz View Post
Why not modify the jpipe length to deal with the drone frequency? It seems to me that you moved the drone frequency a little so you need to change the length.


Also...any photos of your Jpipes or do you remember the length of the Jpipe?
i dont remember the length but i think they are still necessary for the drone at that rpm range, i just think that it widened with the headers. perhaps its just simpler to try and troubleshoot the j-pipes vs get something like a new cat back. or maybe add some res.

ill get some pictures of the j-pipes next week, they are slick because they are completely covered by that plastic piece behind the rear axle. i know its a calculation but im not sure we arent getting to the point that the range is too wide for them to be effective.
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  #4  
Old 03-16-2016, 02:29 PM
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Re: exhaust troubleshoot

Quote:
Originally Posted by firstjeeplast View Post
i dont remember the length but i think they are still necessary for the drone at that rpm range, i just think that it widened with the headers. perhaps its just simpler to try and troubleshoot the j-pipes vs get something like a new cat back. or maybe add some res.

ill get some pictures of the j-pipes next week, they are slick because they are completely covered by that plastic piece behind the rear axle. i know its a calculation but im not sure we arent getting to the point that the range is too wide for them to be effective.
Dont forget those pics . I am really curious to see them.
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  #5  
Old 03-16-2016, 04:16 PM
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Anyone with kooks headers and greens have a cat back they are extremely happy they bought? And don't say GT haus. Not interested in wires/electronics under my winter truck.
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  #6  
Old 03-22-2016, 09:17 PM
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ForumRunner_20160322_201554.png



ForumRunner_20160322_201603.png



ForumRunner_20160322_201612.png



ForumRunner_20160322_201627.png

As promised. Can't believe rust so fast.
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  #7  
Old 03-24-2016, 08:09 AM
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Re: exhaust troubleshoot

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Originally Posted by firstjeeplast View Post
Attachment 66497



Attachment 66498



Attachment 66499



Attachment 66500

As promised. Can't believe rust so fast.
Awesome thanks. I am going to make mine with stainless pipe to get rid if the rust issue.
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  #8  
Old 03-24-2016, 11:52 AM
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Quote:
Originally Posted by Bustanuddz View Post

Awesome thanks. I am going to make mine with stainless pipe to get rid if the rust issue.
Just so u r aware, for no rust u have to use 300 series stainless steel. The easier to work with, more available and cheaper 400 series SS has enough iron content that after the first few full heat cycles the iron will oxidize. It forms a rust petina but won't continue "rusting". Of course, hardware and weld joints will rust to varying degrees and salt doesn't care what series SS u have.

75% or so of all aftermarket hipo exhaust systems r 400 SS except the eye candy tips which they usually make out of 300 SS for this very reason. Corsa and Borla use 100% 300 SS but others avoid it due to cost and the fact that the lack of the softer iron makes 300 SS a beotch to work with and mandrel bends, etc...

Probably way too much info but I was in the mood to share . Good luck with the exhaust.
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  #9  
Old 03-24-2016, 12:21 PM
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Quote:
Originally Posted by GoPlzGo View Post

Just so u r aware, for no rust u have to use 300 series stainless steel. The easier to work with, more available and cheaper 400 series SS has enough iron content that after the first few full heat cycles the iron will oxidize. It forms a rust petina but won't continue "rusting". Of course, hardware and weld joints will rust to varying degrees and salt doesn't care what series SS u have.

75% or so of all aftermarket hipo exhaust systems r 400 SS except the eye candy tips which they usually make out of 300 SS for this very reason. Corsa and Borla use 100% 300 SS but others avoid it due to cost and the fact that the lack of the softer iron makes 300 SS a beotch to work with and mandrel bends, etc...

Probably way too much info but I was in the mood to share . Good luck with the exhaust.
Yah I'm a little surprised at the rust tbh. The place I got those pipes done should have known better.
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  #10  
Old 03-24-2016, 09:59 PM
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Re: exhaust troubleshoot

Quote:
Originally Posted by GoPlzGo View Post
Just so u r aware, for no rust u have to use 300 series stainless steel. The easier to work with, more available and cheaper 400 series SS has enough iron content that after the first few full heat cycles the iron will oxidize. It forms a rust petina but won't continue "rusting". Of course, hardware and weld joints will rust to varying degrees and salt doesn't care what series SS u have.

75% or so of all aftermarket hipo exhaust systems r 400 SS except the eye candy tips which they usually make out of 300 SS for this very reason. Corsa and Borla use 100% 300 SS but others avoid it due to cost and the fact that the lack of the softer iron makes 300 SS a beotch to work with and mandrel bends, etc...

Probably way too much info but I was in the mood to share . Good luck with the exhaust.
Nah, this is good info. I already have a good knowledge of the different types of stainless. I am actually just going to use 409SS like the factory. It will be welded with 309 welding wire. I am doing mine with the tubes going straight across under the factory cover. I will not have any bends in it. It makes things cheap and simple. I will get two sections of 2" 409SS, notch out one side. test fit...... cap the end at 37" and weld it all up. I might make a slip joint for a little adjustability.

Hell I might actually add two hemholtz reso's to mine. One for the regular drone and the other for the MDS drone. Probably not though. The only time it really bothers me is on the highway and I can simply manually shift to get rid of the mds.
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  #11  
Old 03-24-2016, 10:29 PM
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Re: exhaust troubleshoot

sounds like u r on it...I think the reso's are the only real cure (or mostly so) for the header drone....what's the 37" thing about?
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  #12  
Old 03-26-2016, 11:28 PM
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Re: exhaust troubleshoot

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Originally Posted by GoPlzGo View Post
sounds like u r on it...I think the reso's are the only real cure (or mostly so) for the header drone....what's the 37" thing about?
37 inches was the optimum length for the specific drone frequency that I am experiencing.

I am going to finish my deadening process first to make sure that the drone frequency does not move on me. Sound deadening will alter the resonant frequency of the vehicle.
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