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Unread 05-28-2012, 08:40 PM   #1
crh86
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Join Date: May 2012
Posts: 8
Catalyic converter

Ok so my question is this. Do you really need a cat on your jeep? I know it's illegal in most areas. Here where I'm at it's not. I don't have emissions. Will the jeep run better with out it or will it suck the gas? I have a 95 wrangler with the 4.0. Im trying to make it breath as best as possible.

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Unread 05-28-2012, 09:48 PM   #2
25greenwrangler
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1997 TJ Wrangler 
 
Join Date: Aug 2011
Location: Hull, Iowa
Posts: 156
the tj have a o2 sensor in the cat so ya might have to work around that it willrun better and sound better imho and mine has ben without one for 4 years
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Unread 05-29-2012, 08:41 AM   #3
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,119
Quote:
Originally Posted by crh86 View Post
Ok so my question is this. Do you really need a cat on your jeep? I know it's illegal in most areas. Here where I'm at it's not. I don't have emissions. Will the jeep run better with out it or will it suck the gas? I have a 95 wrangler with the 4.0. Im trying to make it breath as best as possible.
If your in the US it is 100% illegal to remove the cat(s) regardless if you have emission tests or not.$2500 fine per cat removed if caught.

It will run worse without a functioning cat and use much more gas.Modern cats really do not add any back pressure so that theory of removing them will make the exhaust flow better is false.
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Unread 05-29-2012, 09:59 AM   #4
crh86
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Yikes!!! Didn't know it was that much of a fine! My friend removed his awhile back( on a different vehicle) and it sucked the gas. From all my research I understand now that having a cat isn't goin to restrict my flow much. Thanks guys.
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Unread 05-29-2012, 10:06 PM   #5
flyboy14295
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2000 WJ 
 
Join Date: Oct 2008
Location: New York
Posts: 656
You're also saving a penguin by leaving it on....
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I came into this world via broken rubber, i'm not going out the same way.
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Unread 05-30-2012, 12:50 PM   #6
RogueFab
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Join Date: Apr 2012
Location: Portland, Oregon
Posts: 134
No emissions testing means you don't have to replace your cat when it fails. If you intentionally mess with emissions equipment (especially CCs), you can be fined huge amounts (as stated earlier).

Catalytic converters wont affect your fuel economy, they burn hydrocarbons (fuel) downstream of the primary 02 sensor, which your vehicle uses to tell how much unused air is in the exhaust system.

Cats don't have significant performance reducing powers. They resist flow some, and probably limit you by 1-3 HP between 5000 and 6500 RPM. How often will you see that? I did put a 2.5" hi-flow cat on my turbo 6 powered offroad rig, but it revs to 7K. And I would never cut it out. Too easy to see underneath it!
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