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Exhaust 5.9L Exhaust Discussion


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  #1  
Old 10-27-2009, 09:39 PM
Zekery360 Zekery360 is offline
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Default Major Exhaust Overhaul

I am wondering if anyone knows how I can get my single cat system to become a two cat system. I want to run long tube headers, and probably some nice performance exhaust system off that. I just don't know how I am going to get from a single cat to a dual without messing with my truck's computer. I just know that this engine needs to breathe far better then it does right now. Calling a major design ball-drop there. But if anyone has done this or knows how, please point me in the right direction, I would love it!
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Old 10-27-2009, 10:15 PM
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Well , my plans are to run two cats also . Not sure if you'll find anyone out there to do this for ya or if your capable of doing it yourself . Off the long tubes , dual pipes to dual convertors . In between the pipes before the cats hole saw a hole in each pipe looking at one another . Weld in a balance pipe of say 1 1/4" in diameter in between these pipes over top of the holes . This will allow for you to install a bung for the O2 sensor to pick up exhaust stream gases . Then do the same in the pipes after the cats doing the same procedure for the O2 sensor . This also will allow for the after cat O2 sensor to pick up exhaust stream gases . Thats what my plans are . Wish I could of drawn it out for ya . But you should have the general idea . Talk to ya soon . Tom
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Old 10-27-2009, 10:30 PM
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So almost like putting an X-pipe before and after the cat? I think my system just runs off one 02 sensor as well, so that might make it easier. I'll have to double-check that though. I have a 2002 with the 360 if anyone knows offhand. And would I be putting the 02 sensor in that middle balance pipe? I think I have everything right in my head...
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Old 10-27-2009, 10:36 PM
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Quote:
Originally Posted by Zekery360 View Post
So almost like putting an X-pipe before and after the cat? I think my system just runs off one 02 sensor as well, so that might make it easier. I'll have to double-check that though. I have a 2002 with the 360 if anyone knows offhand. And would I be putting the 02 sensor in that middle balance pipe? I think I have everything right in my head...
You should have two . My '01 has two . Yeah , put the sensor in the middle so it reads both left and right pipes .
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Old 10-27-2009, 11:38 PM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
You should have two . My '01 has two . Yeah , put the sensor in the middle so it reads both left and right pipes .
you can buy an X-pipe from summit for ~30 bucks iirc. the O2 sensors can be placed on one side of the exhaust. there is an upstream sensor which should be placed before the cat and the downstream sensor about a foot behind the cat. dont place the downstream sensor in the balance tube or too far downstream otherwise the theres a strong possibility that it will kick on the CEL. it may be better to fit some shortys on there due to the fact that it gets real tight around the starter area. i recently had to install a set of S&S long tubes on a dak r/t and the body had to be lifted off the frame just to get them in the engine bay. HTH
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Old 10-28-2009, 02:14 AM
Zekery360 Zekery360 is offline
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If I put the o2 sensors on one side, won't it be reading innacurately? It would only be reading half of what would be the total oxygen. It wouldn't matter much at WOT, but during daily driving would that not be a problem?
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Old 10-28-2009, 11:25 AM
34blazer 34blazer is offline
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Quote:
Originally Posted by Zekery360 View Post
If I put the o2 sensors on one side, won't it be reading innacurately? It would only be reading half of what would be the total oxygen. It wouldn't matter much at WOT, but during daily driving would that not be a problem?
no thats not how they work, how will the sensors know if only half the exhaust is flowing thru? they produce and measure voltage from the exhaust the flows by them. they are just heated narrowband O2 sensors. you need not worry until you get into custom ECU tuning and work with wideband O2's
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Old 10-29-2009, 01:23 PM
Zekery360 Zekery360 is offline
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I just figure that it would be more accurate if it read all the exhaust out of the engine. I am really only familiar with factory exhaust setups, I have never really done or seen this done. But if I can just get away with reading one side, that would save some welding and such.
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Old 10-29-2009, 10:03 PM
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Quote:
Originally Posted by Zekery360 View Post
I just figure that it would be more accurate if it read all the exhaust out of the engine. I am really only familiar with factory exhaust setups, I have never really done or seen this done. But if I can just get away with reading one side, that would save some welding and such.
the O2 sensor needs to be placed directly in the path of the exhaust flow, and as close to the manifold/header as possible. O2 sensors are far more accurate at higher temps. unless there's a patch in the factory mask to add another set of upstream/downstream O2 sensors, reading one side of the exhaust will suffice. HTH
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