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Old 03-18-2010, 09:24 AM
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Removing catalytic converter

Hi,
Assuming emission control is not a problem (which is my case, as there are no emission laws in my country), what problems or benefits will I get from removing catalytic converters?
Will O2 sensors go berserk?
Will I get fuel better consumption?
More power?

Thanks.
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Old 03-18-2010, 09:48 AM
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Re: Removing catalytic converter

hey bud! yes more power will come from removing the cats! i just removed only my front small pre cats on my 01 v8 and i notice a way better pick up with them off. my mileage is a lil better to if i could stay off the gas long enough i would see a beter increase. my o2 sensors are ok no CEL as of 200 miles and if they do go beserk it will prolly be your downstream ones that do in that case there is a small cheap trick you can do to fix he CEL coming on issue. if this happens to me i will be doing the trick but the CEL coming on will not mess with any air/fuel ratios for your motor so your motor will run fine. You will just have a annoying light until you do the cheater trick for your downstream o2's. Thats if it even comes on.
Do you have the i6 or v8???

so more power because of the better less restrictive exhaust
better fuel if you can stay of the gas
and yes more power.

You may want to get a nice hi flow muffler to toss in there to complament your opened up front half!

I have a dynomax super turbo setup sounds great and not too loud.

hope this helps


Joe
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Old 03-18-2010, 12:20 PM
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Re: Removing catalytic converter

josef15111
Thanks for reply.
I have 4L i6 2003, with California emission. It has 4 sensors, 2 upstream and 2 downstream http://www.wjjeeps.com/oxygen_40.jpg

o2 sensor drives me nuts! changed it but still get P0138 error code. mileage is also very bad.
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Old 03-18-2010, 02:03 PM
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Re: Removing catalytic converter

In some vehicles, you will lose low end torque by removing the cats;found this out on my v6 SHO, and put high flow cats in after removing the stock ones for a while. if there is a notable improvement in pickup after removing them, it is likely the old cats were worn and getting plugged up, making the car run worse than it should.
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Old 03-19-2010, 08:31 AM
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Re: Removing catalytic converter

yes on ford motors don't they tend to need and use the back prssure from the restricted air flow for a lil more torq. I had a Thunder bird and was reading alot about them needing the back pressure to run good. and like i stated i have the v8 i noticed the lil power gain and better fuel mileage.
Did you change any sensor or just get them mixed up when putting them back in? try to check all your connections to make sure they are all connected that was my problem its worth a shot


Joe
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Old 05-08-2010, 03:40 PM
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Re: Removing catalytic converter

What is the cheater trick??? and will it cause any other problems by doing the cheater trick?

Jennifer
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Old 05-09-2010, 11:44 PM
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Re: Removing catalytic converter

A lot of people says this works but idk. I will give it a try when i do it next week.

http://forums.evolutionm.net/evo-how...ouler-how.html
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Old 05-10-2010, 08:38 AM
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Re: Removing catalytic converter

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Originally Posted by Geauxbeauti View Post
What is the cheater trick??? and will it cause any other problems by doing the cheater trick?

Jennifer
The purpose of the rear O2 sensors is simply to tell you when the cat needs replaced. They don't actually do anything for the motor.

On my Mustang there are 2 ways to turn them off, one is with a handheld tuner and the other is by making or buying MIL eliminators. The MIL eliminators are simply a resistor and capacitors wired to replicate a good O2 signal. It won't cause any problems with your engine (unless you keep your cat and it plugs up).
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Old 05-13-2010, 10:54 PM
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Re: Removing catalytic converter

those dam cats..lol. so i have a 04 wj with the I-6, my friend had a header that came of his 95 jeep with six. so i figured i could cheat and get them dam cats out of thier,so i relocated the o2's big mistake my o2s went crazy and i lost low end power. well at that point i took of the header and bought one for my year, which used the cats. i gained more low end torqe than i ever had... take it or leave it, but i would leave in the cats...
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Old 05-14-2010, 07:37 AM
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Re: Removing catalytic converter

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Originally Posted by mountian goat View Post
those dam cats..lol. so i have a 04 wj with the I-6, my friend had a header that came of his 95 jeep with six. so i figured i could cheat and get them dam cats out of thier,so i relocated the o2's big mistake my o2s went crazy and i lost low end power. well at that point i took of the header and bought one for my year, which used the cats. i gained more low end torqe than i ever had... take it or leave it, but i would leave in the cats...
You lost power because you relocated your FRONT O2 sensor. The front O2 sensor monitors the exhaust gases out of the engine. Based on it's measurements, it tells the ECU to add/remove fuel from the mixture. Messing with the front O2 sensor changes the air/fuel ratio. The rear O2 sensor is just to determine if the cat needs to be replaced. It does not change anything in the engine.

Are the cats on these vehicles on the headers? That's weird if they are.
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Old 05-15-2010, 05:51 PM
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Re: Removing catalytic converter

thanks for the info but, i already knew how the o2's work. i didnt lose power because i relocated the the o2 in the wrong spot, it was a comination of things, like the header wasnt a 2 piece system like the manifold, and since i have two cats and 4 o2 sensors the computer is pretty picky,so i went and bought a two piece header that bolted up to my cats, than i relocated the o2's and bam i got my low end power back and the o2's are not wigging out... now jeep did make some wj's with just 2 o2's and with that system you can get by cutting out the cat's and it also lets you use the one piece header system like i tryed....
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Old 05-16-2010, 11:51 PM
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Re: Removing catalytic converter

just wondering before I do this was it an easy job taking them apart and welding the new ones in? Not to much trouble or hassles other than the o2 sensors.
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