If I remove the cat will I have problems with O2 Sensor? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-05-2003, 12:53 PM   #1
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Default If I remove the cat will I have problems with O2 Sensor?

I am going to start working on my exhaust soon. I was thinking about going without the cat but I am afraid of the second O2 sensor giving me problems. Would it be better to buy a high flow cat? Is there anyway to bypass the 2nd O2 sensor so it won't give me problems with the computer?

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Old 05-05-2003, 01:23 PM   #2
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Default Re: If I remove the cat will I have problems with O2 Sensor?

Quote:
Originally Posted by parallelcircuits
I am going to start working on my exhaust soon. I was thinking about going without the cat but I am afraid of the second O2 sensor giving me problems.
Yes.

Quote:
Originally Posted by parallelcircuits
Would it be better to buy a high flow cat?
Yes.

Quote:
Originally Posted by parallelcircuits
Is there anyway to bypass the 2nd O2 sensor so it won't give me problems with the computer?
No.

Realistically, what problem are you trying solve here, anyway? The convertor isn't really low-flow to begin with, and the engine systems are designed to acommodate it. If you go with no convertor at all (I assume you don't have emissions tests out where you live, you lucky dawg) your exhaust is going to smell like a cheap lawnmower. I'd leave the original convertor, or swap in a high-flow if the original is shot.
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Old 05-05-2003, 01:31 PM   #3
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I live in Arkansas, we don't even have to have an inspection any more. They stopped inspecting vehicles a couple of years ago.

I was just looking for more power and though it might give it a little more flow, but I have been reading some other posts about exhaust systems and It looks like if give it to much flow I will loose my low end torque. At this point that is what I really want. The top end is set at about 107mph so it doesn't make any sence to give it more power up there because the cutoff will always be there. I am planning on putting different mufflers on it still. What are some good ways to improve the low end power?
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Old 05-05-2003, 04:48 PM   #4
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Quote:
Originally Posted by parallelcircuits
I am planning on putting different mufflers on it still. What are some good ways to improve the low end power?
You can have fun with mufflers, but for low-end power I think you need to focus up front at the engine. Figure that you need to (1) get exactly the right mixture in there as best you can, and then (2) make it go bang as efficiently as possible. Therefore you want to concentrate on fuel delivery and ignition; the engine really doesn't have any breathing problems out the back, to speak of. Anyone here who'* retrofitted aftermarket ignition systems, chips and such can advise you better than me, though...
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Old 05-05-2003, 08:43 PM   #5
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I have a set of Iridium IX plugs that I need to install and I plan on getting a set of taylor wires. I will probably get a MSD Ignition later on when I save up some money. How would I adjust the fuel ratio?
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Old 05-06-2003, 02:26 AM   #6
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Default there are ways around o2 sensors

ok i work at a muffler shop in michigan and there is a company that makes a dummy o2
for your second sensor.. the first one will not be effected. i am not sure of the name though check with a performance shop. flowmasters sound nice with a 3800. as far as low end torque and power.....super chip better plugs.
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Old 05-06-2003, 09:22 AM   #7
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I've removed my CAT a long time ago. I have installed a resonator (Glass pack) in it'* place to achieve the proper back pressure for the O2 sensor.
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Old 05-06-2003, 11:51 AM   #8
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Quote:
Originally Posted by DeathRat
I've removed my CAT a long time ago. I have installed a resonator (Glass pack) in it'* place to achieve the proper back pressure for the O2 sensor.
I hate to sound dense here, but if you replaced the cat with a resonator that simulates the same back pressure, what have you achieved other than to bump pollution levels up by a few microns?
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Old 05-06-2003, 12:40 PM   #9
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A really bitchin soundin exhaust
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Old 05-06-2003, 03:24 PM   #10
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A really bitchin soundin exhaust
I figured you would say that.
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