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Old 07-31-2013, 04:09 PM   #31
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When I bought my ride it was set up with no cat and no o2 sensor. I don't have a single complaint with anything regarding the performance of the engine. I'm totally anal about the jeep so that's a lot for me to say. Hopefully someone else that knows a lot more than myself can also reply to your question. This is just what is going on for me.

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Old 07-31-2013, 05:25 PM   #32
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The reason I ask is because my engine has some good tug at lower RPMs but the moment you try to tach it up, it turns into an asthmatic fat kid going for a run. I swapped my IAC and O2 sensors and that helped a bit but it still feels a bit backed up and the passenger floor heats up

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Old 07-31-2013, 06:12 PM   #33
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Ok so if I am understanding this question you want to know if removing the catalytic converter or muffler will pact the o2 sensor?

If that is the question I am fairly certain the answer is no.

The way the 02 sensor works is that it measures the amount of 02 in the exhaust pipe not enough and you are running rich to much you are running lean.

Since the sensors works off of a chemical reaction which produces an electrical signal that talks to the computer it can effect engine performance I.e. lean it wants to dump more fuel.

But remember if you have done the nutter bypass you are not using your on board computer to control fuel to air mixture any more you are using the mechanical parts of the carb.

Lastly on some jeeps namely mine with the 4.2l engine the o2 sensor is in the manifold just before the first piece of pipe that goes to the cat.

I know that is long winded and I did not cover the pollution side of the equation but hopefully that addresses your question.

If all else fails GTS or google that sh$& for more info

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Old 07-31-2013, 06:15 PM   #34
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Also if your engine runs rough at higher rpm's and it is a carb engine it could be your mixture or timing

If efi it could still be timing

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Old 07-31-2013, 06:43 PM   #35
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Mines an 88 with a 258.. Will pulling the cat completely out and running a muffler screw with the back pressure needed to run correctly on the 258?
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Old 07-31-2013, 06:44 PM   #36
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The reason I ask is because my engine has some good tug at lower RPMs but the moment you try to tach it up, it turns into an asthmatic fat kid going for a run. I swapped my IAC and O2 sensors and that helped a bit but it still feels a bit backed up and the passenger floor heats up
When I read those symptoms I really think your cat is going. That's exactly what happens when it's pretty clogged already. Symptoms are classic like it's choking and can't get air.
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Old 07-31-2013, 06:45 PM   #37
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Mines an 88 with a 258.. Will pulling the cat completely out and running a muffler screw with the back pressure needed to run correctly on the 258?
Didn't with mine
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Old 07-31-2013, 07:00 PM   #38
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When I read those symptoms I really think your cat is going. That's exactly what happens when it's pretty clogged already. Symptoms are classic like it's choking and can't get air.
x2
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Old 07-31-2013, 07:03 PM   #39
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Mines an 88 with a 258.. Will pulling the cat completely out and running a muffler screw with the back pressure needed to run correctly on the 258?
no but you may get speeding tickets
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Old 07-31-2013, 07:03 PM   #40
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Im looking into the flowmaster 40's as well
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Old 07-31-2013, 07:13 PM   #41
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x2
You were exactly the forum member I was hoping would show up. That's the bottom line guys
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Old 07-31-2013, 07:19 PM   #42
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SO lets say i pull the cat, will i have the right amount of back pressure? Dont wana pull it and then blow out some seals.
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Old 07-31-2013, 07:23 PM   #43
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Im looking into the flowmaster 40's as well
I had one on a 4.0 tj ..it had a good deep tone that everyone complimented..I also have a cj7 running a 350 chevy with 2 of them connected to corvette ramhorns through 2 1/2 inch pipes that sounds bad ass
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Old 07-31-2013, 07:26 PM   #44
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SO lets say i pull the cat, will i have the right amount of back pressure? Dont wana pull it and then blow out some seals.
I have pulled a lot of them over the years on mine and all it ever did to any of them was make them run better
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Old 07-31-2013, 07:33 PM   #45
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Gorilla....check your box I just sent you a private message
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Old 07-31-2013, 07:34 PM   #46
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You were exactly the forum member I was hoping would show up. That's the bottom line guys
in my opinion you were dead on,you didn't need any help
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Old 07-31-2013, 07:38 PM   #47
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I live in fl and I replaced my cat with a piece of straight pipe. No emission inspection here.
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Old 07-31-2013, 09:53 PM   #48
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DECISION MADE!! straight pipes all the way! Thanks Harley and Florida!
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Old 07-31-2013, 10:34 PM   #49
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Also on the side note while we talk about mufflers... Think this is a good replacement for the CATCherry Bomb Mufflers / Glasspack......................................
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Old 07-31-2013, 11:28 PM   #50
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Also on the side note while we talk about mufflers... Think this is a good replacement for the CATCherry Bomb Mufflers / Glasspack......................................
People have mixed feelings about glasspacks so here's my opinion.....do it! I've had a few Jeeps and lets start with stock mufflers....crap! Dynomax....broke apart inside. Flowmaster.....shoved my tailpipe into the Flowmaster on the Rubicon. Finally installed a Blue knight glasspack and loved it. Very quiet at idle and good tone under a load. You can vary the sound with different lengths and diameters. Call the local muffler guy and ask some questions.
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Old 08-01-2013, 12:58 AM   #51
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People have mixed feelings about glasspacks so here's my opinion.....do it! I've had a few Jeeps and lets start with stock mufflers....crap! Dynomax....broke apart inside. Flowmaster.....shoved my tailpipe into the Flowmaster on the Rubicon. Finally installed a Blue knight glasspack and loved it. Very quiet at idle and good tone under a load. You can vary the sound with different lengths and diameters. Call the local muffler guy and ask some questions.
Thanks, Imma try and ask him if he will take 20
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Old 08-01-2013, 08:39 AM   #52
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Back to the beginning of the post, normal Cat operating temps are between 1,000-1,200 deg F. If the Cat is going bad, the temps will drop because the chemical reaction in the converter has slowed down.

Install some self adhesive heat tape/blanket on the underside of the body, Summit has them in blanket form.

One down side to removing the Cat will be more unburned hydrocarbons wafting into the cabin, especially if the roof/doors are off. This WILL give the occupants headaches and an possibly also make them sick to their stomachs. (Page three of my book, Ask Me How I Know This)

Keep in mind that the I.D. of the Cat housing is larger the the inlet/outlet to reduce the amount of back pressure produced by the Cat. Removing one does not really improve performance, it's more psychological than anything...
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Old 08-01-2013, 08:49 AM   #53
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Back to the beginning of the post, normal Cat operating temps are between 1,000-1,200 deg F. If the Cat is going bad, the temps will drop because the chemical reaction in the converter has slowed down.

Install some self adhesive heat tape/blanket on the underside of the body, Summit has them in blanket form.

One down side to removing the Cat will be more unburned hydrocarbons wafting into the cabin, especially if the roof/doors are off. This WILL give the occupants headaches and an possibly also make them sick to their stomachs. (Page three of my book, Ask Me How I Know This)

Keep in mind that the I.D. of the Cat housing is larger the the inlet/outlet to reduce the amount of back pressure produced by the Cat. Removing one does not really improve performance, it's more psychological than anything...
catalytic converters do clog up and you can bet that when it gets clogged enough,it will hurt performance..I have no idea what temperature they get to but I have seen many trucks burned to the ground when they were parked in tall grass ( especially hay fields ) and the cat caught the grass on fire
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Old 08-01-2013, 08:56 AM   #54
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Removing one does not really improve performance, it's more psychological than anything...
If the cat is clogged or getting clogged removing or replacing the part does improve performance. Period. That's not psychological
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Old 08-01-2013, 10:30 AM   #55
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If the cat is clogged or getting clogged removing or replacing the part does improve performance. Period. That's not psychological
I absolutely agree that if a Cat is clogged or if the monolith has melted that it will adversely effect performance. My point was that a properly operating Cat has negligible effect on efficiency or performance.
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Old 08-01-2013, 10:32 AM   #56
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catalytic converters do clog up and you can bet that when it gets clogged enough,it will hurt performance..I have no idea what temperature they get to but I have seen many trucks burned to the ground when they were parked in tall grass ( especially hay fields ) and the cat caught the grass on fire
When you REALLY flog a vehicle, the Cat(s) will glow red, that's hot !!
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Old 08-01-2013, 10:48 AM   #57
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I absolutely agree that if a Cat is clogged or if the monolith has melted that it will adversely effect performance. My point was that a properly operating Cat has negligible effect on efficiency or performance.
key words there being "proper operating" and "negligible"
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Old 08-01-2013, 02:11 PM   #58
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I think we have a new hot button topic like 8.8 vs DANA 44!


Somebody throw gasoline on this fire quick!

Chief
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Old 08-01-2013, 02:23 PM   #59
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I think we have a new hot button topic like 8.8 vs DANA 44!


Somebody throw gasoline on this fire quick!

Chief
lmao
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Old 08-01-2013, 04:44 PM   #60
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Took my cat off, beat the inards out, put it in. now it sounds better and idles better!

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