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post #1 of 28 (permalink) Old 10-29-2003, 02:08 PM Thread Starter
 
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Gutting cats OK with heavy mods?

I've been doin a little research and I saw some people say that if you're not making a good amount of power and you gut the cats you'll lose low end tq. and I'm just curious if with all the mods I have listed in my sig. if I will have any problems with gutted cats like that? Right now my cats are crapped out. I know this because with the cats attached I don't have any power at all and can barely get the car above 20 MPH, but when I disconnect the exhaust, it runs like a bat outa hell. Man is it LOUD! Everyone at my dorm thought I had an industrial sized tractor lol. But so what I am going to do is drop the exhaust (already did) and cut the cats off, take something long and sharp and break everything that's inside the cats (I have the O2 sensors taken care of on my chip) and then just put everything back together. I'm not having an exhaust shop work on it because I live in the state capital and they're crazy about not modifying stock exhaust... it sucks. So yeah, think I will run into any problems??

-Ryan
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post #2 of 28 (permalink) Old 10-29-2003, 03:22 PM
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yes you will lose low end torque but it will rev quicker and make more top end power. i unbolted mine and took it too and exhaust shop and had them make me the pieces. was a small shop they didnt ask any questions but i payed 90 for them because i think they knew what i was doing

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post #3 of 28 (permalink) Old 10-29-2003, 04:29 PM
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Seeing as you've done a pretty decent amount to your car I don't think you'll lose that much torque. When I put on my true duals with hi flow cats I barely lost any torque and you've got more stuff in your engine then I do. Rip them babies apart.
-Thomas

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post #4 of 28 (permalink) Old 10-29-2003, 07:28 PM
 
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(I have the O2 sensors taken care of on my chip)
I didn't know that any 3.8's had rear O2's. I'm pretty sure that the ones in front would not be affected by gutting the cats.

As a matter of fact haveing plugged or restrictive cats is a great way to blow your headgaskets. I know, I've blown 3 pairs now. I would say gut them damn things.
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post #5 of 28 (permalink) Old 10-29-2003, 10:44 PM Thread Starter
 
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Sweet, alright thanks a lot boys
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post #6 of 28 (permalink) Old 10-29-2003, 11:14 PM
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All OBDII MN12's have 4 o2 sensors. which were 94+ MN12's.
-Thomas

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post #7 of 28 (permalink) Old 11-01-2003, 12:36 PM Thread Starter
 
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Yeah I wasn't too worried about the O2 sensor not only because of where it is, but just like I said, my chip covered it. I got around to hacking those things off and gutting them yesterday. Now I know what that honeycomb stuff on the inside looks like!! It took me quite a while to get all of it out, but I managed. Those suckers are hollow now. All I have to do is bring the pipes and everything home to get it welded all together, and I'm golden... I'm so glad, the bird has POWER again Thanks guys.
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post #8 of 28 (permalink) Old 11-01-2003, 01:39 PM
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So I guess you didn't actually hurt anything when you ran it without oil for a while? It was just the plugged cats? That's good.
-Thomas

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post #9 of 28 (permalink) Old 11-01-2003, 03:25 PM
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Quote:
Originally posted by Thomas
All OBDII MN12's have 4 o2 sensors. which were 94+ MN12's.
-Thomas
The 94-95 3.8L N/A's weren't OBDII (they don't have 4 O2's either). I'm not certain about the 94-95 SC's, but I do know for sure that the 94+ 4.6L's were OBDII (with 4 O2 sensors).

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post #10 of 28 (permalink) Old 11-01-2003, 05:12 PM
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oh i thought all 94+ cars were OBDII. guess i just based my knowledge off of seeing that my 95 v8 had OBDII
-Thomas

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post #11 of 28 (permalink) Old 11-01-2003, 11:00 PM Thread Starter
 
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I always thought my car had 2 O2 sensors... was I correct? There is one in the engine somewhere and then there is one in the passenger side cat... *shrugs*
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post #12 of 28 (permalink) Old 11-01-2003, 11:52 PM
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Yes, your car does have two O2 sensors. They are both located before the cats, either at the collector of the exhaust manifold or just above the catalytic convertor in the downtube (one on the driverside, one on the passenger side).

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post #13 of 28 (permalink) Old 11-02-2003, 10:08 AM Thread Starter
 
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There isn't an O2 sensor in the drivers side manifold, only in the pass. side. I would know, I just broke everything inside them haha
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post #14 of 28 (permalink) Old 11-02-2003, 12:43 PM
 
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Quote:
Originally posted by Spike
There isn't an O2 sensor in the drivers side manifold, only in the pass. side. I would know, I just broke everything inside them haha
THen it's on the downtube below the manifold.
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post #15 of 28 (permalink) Old 11-02-2003, 01:17 PM Thread Starter
 
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Nope, there isn't any wires going anywhere on the drivers side anything, and only one wire going to the O2 sensor that's in the cat right BEFORE it on the passenger side... That's all.
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post #16 of 28 (permalink) Old 11-02-2003, 01:23 PM
 
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Well I forget which side is which, but one is in the down tube and one is in the manifold. You have 2 O2 sensors, it's up there somewhere.
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post #17 of 28 (permalink) Old 11-02-2003, 01:23 PM
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So you don't have a driverside O2 sensor in your exhaust? And it's not throwing any codes? Also, your o2 sensors should each have 3 or 4 wires going to them. Something is not right there.

-Rod

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post #18 of 28 (permalink) Old 11-02-2003, 02:59 PM Thread Starter
 
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no, the one O2 sensor that's in the pass. side cat has more than one wire going to it. There is NO O2 sensor in any of my downtubes. The O2 sensors wouldn't throw any codes because I have my chip setup to eliminate them. But yeah, trust me on this, my entire exhaust minus the manifolds was sitting on the grass next to my car the other day, and I only unplugged ONE thing to take all the exhaust off, so unless there's a wireless O2 sensor somewhere that I don't notice than I only have one.
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post #19 of 28 (permalink) Old 11-02-2003, 03:28 PM
 
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Quote:
Originally posted by 93SC
Well I forget which side is which, but one is in the down tube and one is in the manifold. You have 2 O2 sensors, it's up there somewhere.
Or, it's in the manifold, which you did not have on the ground with the rest of your system. You have 2.
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post #20 of 28 (permalink) Old 11-02-2003, 04:02 PM
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a chip WIL NOT ELIMINATE the front O2 sensors and the computer needs them to calculate A/F ratio, there HAS to be one on each bank of cylinders (so you HAVE to have 2 of them). A chip can eliminate the Rear O2's if your car is equipt which them, those just check the effecency of the cats. Its either in the manifold or in the pipe before the cat no ifs, ands, or buts.
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post #21 of 28 (permalink) Old 11-02-2003, 06:04 PM Thread Starter
 
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When did I say my car didn't have more than one O2 sensor? I was just saying that from the collectors to the exhaust tips under my car there is only ONE O2 sensor, and it's inside the passenger side cat at the exhaust entrance, I understand there are more than one on the car!
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post #22 of 28 (permalink) Old 11-02-2003, 06:13 PM
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that just the way is comes across the way I read it, it sounded like you were saying you only found 1 O2 sensor, sorry.
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post #23 of 28 (permalink) Old 11-02-2003, 10:32 PM
 
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Quote:
Originally posted by Thomas
All OBDII MN12's have 4 o2 sensors. which were 94+ MN12's.
-Thomas
The 94 and i believe the 95 3.8L's were NOT OBD-II. Still EEC-IV and OBD-I.. Check out the OBD-II connector on the passenger side... "NON-FUNCTIONAL ON 3.8L ENGINES"
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post #24 of 28 (permalink) Old 11-02-2003, 11:05 PM
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Quote:
Originally posted by Vegeta99


The 94 and i believe the 95 3.8L's were NOT OBD-II. Still EEC-IV and OBD-I.. Check out the OBD-II connector on the passenger side... "NON-FUNCTIONAL ON 3.8L ENGINES"
Yeah, we kind of cleared that up already.

Quote:
Originally posted by racecougar

The 94-95 3.8L N/A's weren't OBDII (they don't have 4 O2's either). I'm not certain about the 94-95 SC's, but I do know for sure that the 94+ 4.6L's were OBDII (with 4 O2 sensors).

-Rod

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post #25 of 28 (permalink) Old 11-03-2003, 12:13 AM
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Quote:
Originally posted by racecougar


The 94-95 3.8L N/A's weren't OBDII (they don't have 4 O2's either). I'm not certain about the 94-95 SC's, but I do know for sure that the 94+ 4.6L's were OBDII (with 4 O2 sensors).

-Rod

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post #26 of 28 (permalink) Old 11-03-2003, 01:13 AM
 
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ummmmm......how many 02 sensors are there in 93 232s??? and where are they?
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post #27 of 28 (permalink) Old 11-03-2003, 01:27 AM
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there are two on the 93's. Not sure where. I have a factory exhaust system in my garage but it's too late and cold to go look. I want to say they're both int he downtubes.
-Thomas

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post #28 of 28 (permalink) Old 11-03-2003, 02:04 AM
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There is one on each side. They are either located in the collector of the manifold or in the downtube just before the catalytic convertor.

-Rod

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