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Topic Review (Newest First)
08-02-2013 12:06 AM
JACK3D I won't speak of the illegal removing of a catalytic converter any more.

I respect the forum rules about not posting about it die to the fact that it is illegal.

I would like to state that I haven't the slightest clue as to why not having one is illegal? If it doesn't work properly, it isn't doing the job it's suppose to do. Therefore, not properly "protecting" the precious environment. It may be illegal in all states to not have one, but why did some states eliminate E-Checks? We used to have them here in KY, I remember having to take my first pickup truck to get checked. That wasn't long ago, 11 years to be exact.

Anyways, I respect the forum rules. Won't post about it anymore.
08-01-2013 11:15 PM
87 Florida YJ Actually I had a conversation with the moderator (who happens to be a decent guy it turns out) and its all about the legal issues concerning the fact that cat removal is illegal in all states. And it seems like its a hot button issue in the entire automotive world. They just cant risk the possible liabilities which could result from threads openly discussing (and kind of promoting in ways) how to break the law. It's a point well taken which I'm going to respect.
08-01-2013 10:36 PM
1987Wrangler YJ They closed it because people wanted to make there jeeps run better? LOL Did they close it because it was against the law?
08-01-2013 09:54 PM
87 Florida YJ
Quote:
Originally Posted by 1987Wrangler YJ View Post
Yeah same, it's a lot more quite at idle. And what the heck is a "mod squad"???
Look at the last entry on the thread in todays list called CAT which was active until recently and you will see exactly who the Mod Squad is
08-01-2013 09:14 PM
petercass88
Quote:
Originally Posted by 89Saharagreen View Post
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

Chief
Thank you for the info and I love to GTS once I have a starting point from the forums. Looks like all the prius drivers will hate me even more when my exhaust is dumped just past the O2 sensor lol! (Btw I have a 95 2.5L)
08-01-2013 08:31 PM
1987Wrangler YJ
Quote:
Originally Posted by JACK3D View Post
I cut mine off today too. Mine was clogged bad. I didn't put it back though. I ran a straight pipe to the muffler. Got it off without taking the skid plate off. Huge pain in the ass avoided.

I'm very happy with the results.
Yeah same, it's a lot more quite at idle. And what the heck is a "mod squad"???
08-01-2013 07:27 PM
JACK3D
Quote:
Originally Posted by 1987Wrangler YJ View Post
Took my cat off, beat the inards out, put it in. now it sounds better and idles better!
I cut mine off today too. Mine was clogged bad. I didn't put it back though. I ran a straight pipe to the muffler. Got it off without taking the skid plate off. Huge pain in the ass avoided.

I'm very happy with the results.
08-01-2013 07:14 PM
87 Florida YJ
Quote:
Originally Posted by 1987Wrangler YJ View Post
Took my cat off, beat the inards out, put it in. now it sounds better and idles better!
Easy boy. Keep talking like that and the Mod Squad is going to shut down this thread. Behave yourself
08-01-2013 04:44 PM
1987Wrangler YJ Took my cat off, beat the inards out, put it in. now it sounds better and idles better!
08-01-2013 02:23 PM
The Silver Gorilla
Quote:
Originally Posted by 89Saharagreen View Post
I think we have a new hot button topic like 8.8 vs DANA 44!


Somebody throw gasoline on this fire quick!

Chief
lmao
08-01-2013 02:11 PM
89Saharagreen I think we have a new hot button topic like 8.8 vs DANA 44!


Somebody throw gasoline on this fire quick!

Chief
08-01-2013 10:48 AM
harleydragon
Quote:
Originally Posted by peety View Post
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"
08-01-2013 10:32 AM
peety
Quote:
Originally Posted by harleydragon View Post
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 !!
08-01-2013 10:30 AM
peety
Quote:
Originally Posted by 87 Florida YJ View Post
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.
08-01-2013 08:56 AM
87 Florida YJ
Quote:
Originally Posted by peety View Post
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
08-01-2013 08:49 AM
harleydragon
Quote:
Originally Posted by peety View Post
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
08-01-2013 08:39 AM
peety 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...
08-01-2013 12:58 AM
The Silver Gorilla
Quote:
Originally Posted by Mbclark View Post
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
07-31-2013 11:28 PM
Mbclark
Quote:
Originally Posted by The Silver Gorilla View Post
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.
07-31-2013 10:34 PM
The Silver Gorilla Also on the side note while we talk about mufflers... Think this is a good replacement for the CATCherry Bomb Mufflers / Glasspack......................................
07-31-2013 09:53 PM
The Silver Gorilla DECISION MADE!! straight pipes all the way! Thanks Harley and Florida!
07-31-2013 07:38 PM
Mowrangler I live in fl and I replaced my cat with a piece of straight pipe. No emission inspection here.
07-31-2013 07:34 PM
harleydragon
Quote:
Originally Posted by 87 Florida YJ View Post
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
07-31-2013 07:33 PM
87 Florida YJ Gorilla....check your box I just sent you a private message
07-31-2013 07:26 PM
harleydragon
Quote:
Originally Posted by The Silver Gorilla View Post
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
07-31-2013 07:23 PM
harleydragon
Quote:
Originally Posted by The Silver Gorilla View Post
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
07-31-2013 07:19 PM
The Silver Gorilla 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.
07-31-2013 07:13 PM
87 Florida YJ
Quote:
Originally Posted by harleydragon View Post
x2
You were exactly the forum member I was hoping would show up. That's the bottom line guys
07-31-2013 07:03 PM
The Silver Gorilla Im looking into the flowmaster 40's as well
07-31-2013 07:03 PM
harleydragon
Quote:
Originally Posted by Bent axle Bob View Post
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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