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Exhaust 4.7L Exhaust Discussion


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  #11  
Old 11-26-2013, 09:51 PM
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Will do, I'll probably post pictures sunday. I'll have some of my buddy's z28 as well, we are redoing his exhaust too. That's a pretty fun car.

Only thing I'm worried about is if my O2 non fouler trick will work. I've read alot of people have trouble with it on the 4th gens. Not sure what to do if it doesn't work, only other option I can thing of is custom tune but no way I'll give up the superchips. So prob just live with the light... Let's hope the non foulers work...
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  #12  
Old 11-26-2013, 11:54 PM
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Awright,are you using mandrel bent tubing?

I've heard of the non-foulers,but just what exactly are they.
I've never seen a pic or even a discription of what they entail.


Back when i was playing with my supercharged Buick Regal,the trick was to splice a 100 ohm 1/4 watt resistor inline with the back O2 when you dumped the cat,letting a constant low voltage feed through the 02.
I'm not sure if these O2 sensors work the same though with the grounding circuit.
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  #13  
Old 11-27-2013, 12:11 AM
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Yeah all 409 SS, mandrel bent. I am eliminating the cats, and instaling non foulers (see attached pic), and will have the whole exhaust be 6 pieces. dual pipes before the muffler in 4 pieces. The muffler (22" magnaflow dual 2.5" in, singel 3" out) another piece. And stock tailpipe the 6th piece. My current exhaust is nice but the collectors suck(as said above), I used aluminized pipe which is ok but he welds were mild steel, and I wish I made it in more pieces for easier removal/trans removal.





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  #14  
Old 11-27-2013, 02:08 AM
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Or, you can do what I did and just get rid of the Y pipe and get a dual in/dual out muffler. Looks, sounds and works great!
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Old 11-27-2013, 08:26 AM
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Thanks Sean.

Looks like the idea is move the orginal sensor out farther so it runs cooler.
I'm assuming they work on a temperature differential if thats the case.
Could a guy plug the hole and attach the sensor right to the outside of the pipe.
I wonder if a guy could weld a stand-off reciever to the pipe and screw the sensor into it.
Rick
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  #16  
Old 11-27-2013, 09:04 AM
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Quote:
Or, you can do what I did and just get rid of the Y pipe and get a dual in/dual out muffler. Looks, sounds and works great!
That's actually what I am doing, I'm replacing my y pipe with a dual in/single out muffler

Quote:
Thanks Sean.

Looks like the idea is move the orginal sensor out farther so it runs cooler.
I'm assuming they work on a temperature differential if thats the case.
Could a guy plug the hole and attach the sensor right to the outside of the pipe.
I wonder if a guy could weld a stand-off reciever to the pipe and screw the sensor into it.
Rick
I'm pretty sure the way they work is they take a reading outside the pipe and inside the pipe and compare oxygen content (have no idea exactly HOW) and the way this trick works is by spacing the sensor out of the exhaust stream it somehow keeps it within it's range to not throw a code/CEL. Some people also pack steel wool in the spacers.

I've heard of the electronic resistor simulator trick too.

Supposedly computers are getting more difficult to "trick". So we'll see how it goes... It worked on my s10 like a charm though.
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  #17  
Old 11-27-2013, 02:22 PM
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HMM,that's interesting.


If they're checking oxygen content they will be harder to fool.
I thought maybe they might work on a temp differential,but i gotta admit,i'm behind the times on these new ones,lol.
This is the first computor toy i've tinkered with since my old Regal,and it was 10 years ago since i was playing with it,things have changed somewhat since then

Do you know who's exhaust is that in the picture?
Somebody done a nice job on that system

Last edited by Hornet; 11-27-2013 at 02:26 PM.
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  #18  
Old 11-27-2013, 02:27 PM
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  #19  
Old 11-27-2013, 06:50 PM
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LMAO,touche you got me on that one

Rick
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  #20  
Old 11-28-2013, 05:53 PM
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Where are you guys getting the "spark plug non-foulers" from?
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