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vince
Dodge Dakota
7/01/2001
19:11:58
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 Subject: took out cat
IP: Logged
Message:
i have a 00 v-6 dak i recentally took out my cat and installed th kat box. do you think i will be ok. any one else did this
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Art
Dodge Dakota
7/01/2001
19:18:03
| RE: took out cat
IP: Logged
Message:
Is your o2 sensor in front of the cat or behind it? I cant see why there would be any MIL`s or any problems except maybe being illegal when the o2 is in front of the cat.Anyone know why they say that you need this cat-box to remove the cats?
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Smokin
Dakota Enthusiast
7/01/2001
23:43:09
| RE: took out cat
IP: Logged
Message:
If you have only an O2 sensor in front of the cat then you can remove it and you'd be fine. But most every new vehicle I've seen has them behind the Cat so that it can monitor the Cats performance. The KatBox is supposed to send the Correct signal to the Pcm even after the Cat is gone. Basically your just fooling your PCM into thinking the Cat is still their and nothing is wrong with it. If you remove the Cat and do have a Sensor behind it and don't use the Katbox then you'll get the Check engine light and it may hurt performance although I'm not 100% sure on that. I think it makes the truck go into limp mode or something like that.
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Bernd
Gen III
7/01/2001
23:46:51
| RE: took out cat
IP: Logged
Message:
The KatBox is a simple "Tick Tock" circuit that sends the correct voltages back to the PCM. As long as you installed it on the rear O2, you'll be fine.
BTW: Removing the cat on a V6 doesn't do anything for performance until 3000rpm on up (but sounds really good though). Best bet would have been to keep it legal and install a CarSound high-flow cat instead.
1997 Dodge Dakota SLT - V6
Supercharged @ 10#
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Art
Dodge Dakota
7/02/2001
02:29:59
| RE: took out cat
IP: Logged
Message:
well then people with 4.7`s go look I have no o2 after the cat everyones must be the same then
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MPJunkie
Dodge Dakota
7/02/2001
04:14:55
| RE: took out cat
IP: Logged
Message:
Better go check again, Arty. You got about 3 cats and 5 O2 sensors on the 4.7. BTW - don't even think about changing the crossover pipe.
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99DurangoV8
Dodge Dakota
7/02/2001
07:35:05
| RE: took out cat
IP: Logged
Message:
I wondered why my kids started coughing yesterday.
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Mike
Dodge Dakota
7/02/2001
07:40:08
| RE: took out cat
IP: Logged
Message:
I but in Borla headers and only noticed 3 O2 sensors. MPjunkie-Where are the other two?
'00 4.7 CC 4X4.
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Hawkeye
Dakota Enthusiast
7/02/2001
09:40:10
|  RE: took out cat
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Message:
Mpjunkie, Not all 4.7's have 3 cats. Dodge went to the 3 cat setup across the board on the Daks in mid 2000. I got lucky, I have a 4.7 with only 1 cat. The window sticker power rating tells the story without having to crawl under the truck. 235 HP has 1 cat, 230 has 3. All 2001 and up have the 3 cats though to my knowledge.
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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Mike
Dodge Dakota
7/02/2001
09:48:49
| RE: took out cat
IP: Logged
Message:
Good info didn't know that about the cats...Mine has 3 cats. I took another look at the O2 sensors-there are 4 on the models with 3 cats. Not sure about the ones with one cat.
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Smokin
Dakota Enthusiast
7/02/2001
13:29:48
| RE: took out cat
IP: Logged
Message:
I didn't know the 2001 4.7's had 3 cats! I thought the 2 "pre-cats" were it! Is their any way to get rid of the 2 up front and just have the one before the muffler? I would want to replace it with a high flow also. I think having no cat on a 4.7L might not be the best idea as you might lose to much torque due to smaller cubic inches compared to the 5.9L. But I definitly don't think having 3 cats helps things much!
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Hawkeye
Dakota Enthusiast
7/02/2001
13:43:49
| RE: took out cat
IP: Logged
Message:
Yeah, 1 good free flowing cat seems like the best setup to me. Dodge engineers, go figure. Seems a lot of people dont know about the diff cat setups and HP ratings as a result. Also, things like the JBA headers work a lot better with the 1 cat setup cause they are not being restricted right at the end of the header. Mine has 1 o2 sensor if I remember correctly, now I have to go look and see if it is in front or back of the cat. I think it is in front.
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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Art
Dodge Dakota
7/02/2001
15:11:13
| RE: took out cat
IP: Logged
Message:
You were almost right mpjunkie I have 4o2 sensors,one on each side before the pre-cats and one on each side after the pre-cats,didnt see the 2 after without crawling under,no o2 sensor after the big cat tho so bye bye big cat or wonder if I can get the y pipe with no cats and leave the big one,can you see how many o2s you have Hawkeye,usually there will be a o2 on both sides with v8s
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Hawkeye
Dakota Enthusiast
7/02/2001
19:12:38
| RE: took out cat
IP: Logged
Message:
Art, I just went out and double checked. Only 1 o2 sensor right before the cat.
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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Art
Dodge Dakota
7/02/2001
19:25:06
| RE: took out cat
IP: Logged
Message:
Really eh Hawkeye,well you know what that means you can take it off if you want it,Dont know why I have 3 cats and 4 o2s we dont even have emision testing here,gota look into this I cant see it taking so many readings from 4 o2s all the time,I just put in the 3923 plugs and the old ones were all burning real nice,guess the cat setup isnt hurting it much cause the truck hauls ass for a 4x4,smokes the tires no prob.I dont think headers would do much for me but your setup hawkeye might just be worthwhile
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Travis B.
Dodge Dakota
7/02/2001
19:32:52
| RE: took out cat
IP: Logged
Message:
Hawkeye, Did you get a recall notice on your '00 for an emissions sensing problem? My 2000 4.7 Durango was recalled for an issue with the PCM not monitoring the O2 sensor behind the Cat to detect Cat failure. I asked around and checked out the TSB system and I believe the recall went across all early 2000 Dodge trucks and several Jeep models.
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Hawkeye
Dakota Enthusiast
7/02/2001
19:35:33
| RE: took out cat
IP: Logged
Message:
Yeah Art, I was so glad when I found out about the different cat setups. Taking off the cat has crossed my mind since we dont have inspections here, but, the way my luck runs Id be the one that somehow gets caught. I may go to a free flow cat though. As for the headers, yeah I am really excited getting some JBA's as soon as money allows. I think it stinks bigtime that Dodge switched the setup. I personally think that the JBA's will still add a little to the 3 cat setup but your right, it should do really well on the single cat setup.
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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Hawkeye
Dakota Enthusiast
7/02/2001
19:43:33
| RE: took out cat
IP: Logged
Message:
Travis, no I havent gotten a recall yet.
Art, I stand corrected. Something just didnt seem right about the sensors, so I just went out and rechecked, I found a second sensor. Dang thing was hidden on top of the pipe after the cat where the pipe bends up to go over a cross-member. So I actually have 2. I didnt think that the 1 sensor was right. Still only 1 cat though. Hehe. I want to check into the high flow cat. My only concern is loosing too much back pressure.
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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Travis B
Dodge Dakota
7/02/2001
19:55:35
| RE: took out cat
IP: Logged
Message:
Hawkeye, I think the problem was fixed by late September of '99. If your truck is later than that, the JTEC flash was probably fixed. I was more interested in whether the O2 sensor was actually there. Strange how things hide like that. I did't notice the pre-cats on my '01. I had to go out and look after reading the post.
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Hawkeye
Dakota Enthusiast
7/02/2001
20:00:27
| RE: took out cat
IP: Logged
Message:
Travis, my truck was supposedly made in June of 2000, I bought it in Nov. I swear I looked and looked for that second sensor. Didnt make sense for it to not be there. That thing is really hidden. Also further away from the cat then what I expected too.
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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Art
Dodge Dakota
7/02/2001
20:03:56
| RE: took out cat
IP: Logged
Message:
So travis yours is the same as mine?I do not have a o2 after the big cat,anyone know how long the cats are supposed to last?
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mike
Dodge Dakota
7/03/2001
14:12:09
| RE: took out cat
IP: Logged
Message:
Borla makes a set of headers that comes with the Y-pipe. So the customer Rep told me. the cost is $629. I put just the headers on mine and it runs alot better-more power at the bottom end and seems to be better at the top.
'00 4.7 4x4
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Glen
Gen III
7/03/2001
14:29:46
| RE: took out cat
IP: Logged
Message:
So lets say someone comes up with a way to trick the sensors on the pre-cats. Would it be possible to remove them, and just use a JBA y-pipe, or would you need an extention. I'll take a better look at it when my headers show up and i do the install. If at all possible, i'd like to remove the 2 pre-cats, trick the sensors, and run the JBA y-pipe. You guys got any ideas or anything to point me in the right direction? Thanks.
'01, CC, SLT, 4.7, Auto, 3.55 LS
Gibson single catback. Z-tube.
Jet Chip Stage II. 180 T-Stat. Bosch 4417s.
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Bernd
Gen III
7/03/2001
19:34:27
| RE: took out cat
IP: Logged
Message:
There is someone working on this already...the same person who actualy designed the KatBox.
1997 Dodge Dakota SLT - V6
Supercharged @ 10#
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Travis B
Dodge Dakota
7/03/2001
19:53:06
| RE: took out cat
IP: Logged
Message:
Art, No O2 after the big cat on my '01. Most cats will go 100k easy. These are not the same 40 lbs pieces of crap from the mid 70's.
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Art
Dodge Dakota
7/03/2001
20:47:50
| RE: took out cat
IP: Logged
Message:
Hey glen does jba make a y-pipe for the 4.7?I didnt see any listed and Bernd the 2 o2s infront of the cats are for engine management and the 2 after to check how the cats are performing,is that right?so we would need a y-pipe with the placement for the 2 front o2s and a kat-box to hook up to the 2 rear o2s?Is that right Bernd or does it work some other way
thanks
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eddie_orlando
Dodge Dakota
7/03/2001
23:20:46
| RE: took out cat
IP: Logged
Message:
Ahhhh Bernd,
You speak of the mighty Marty Fletcher at KRC, if there is a way to do anything on a Dodge engine he will find it!! Can't wait to visit him on Monday for some more work to my little 2.5 that could!! I'm gettin' there little by little!
ED
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Bert
Dodge Dakota
7/04/2001
01:53:46
| RE: took out cat
IP: Logged
Message:
My buddy has a Ram with a 318 he cut his cat in half gutted it and welded it back together. he also has an o2 on each side of the y-pipe and one behind the cat. He has had no problems at all since doing this.
99x-cab sport,4x4,318,33's
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CyberWolf
Dodge Dakota
7/05/2001
11:57:24
| RE: took out cat
IP: Logged
Message:
Why not just remove the 3 way cat (the big one) and leave the two pre cats. That way you wont have to worry about tricking the o2 sensors and back pressure shouldn't be a problem. That my plans anyway. Hey Bernd, haven't we had the conversation before? hehehe
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Art
Dodge Dakota
7/05/2001
21:48:07
| RE: took out cat
IP: Logged
Message:
Ya thats what I was thinkin too less fuss although I dont like the way the y-pipe is made
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Hawkeye
Dakota Enthusiast
7/06/2001
07:15:25
| RE: took out cat
IP: Logged
Message:
Leaving the precats still wouldnt help much with headers. May help the overall flow some though. But the headers will still be restricted right at their ends by the pre cats. I could be wrong though. Anyone tried this to see if it works?
'00 QC 4x4
4.7 3.55 LSD
32x11.50 BFG AT's
Green Thunder
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smartdakowner
Dodge Dakota
7/07/2001
06:06:55
| RE: took out cat
IP: Logged
Message:
remove your cat in Ohio and the state nics you for $500 to $2500 per day in fines good luck fool
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Art
Dodge Dakota
7/08/2001
10:03:25
| RE: took out cat
IP: Logged
Message:
I took out a couple of dogs in my day but no cats. What is it like to date a cat, smartdakowner? I mean beside the fines of course.
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Bernd
Gen III
7/08/2001
10:08:06
| RE: took out cat
IP: Logged
Message:
Actually Eddie, Marty is buddies with the guy who builds them. Marty doesn't physically build them himself. ;)
The PreCats on the 2001 models are pretty open if you ask me. I just installed a set of headers on a 2001 R/T this last weekend (not yesterday) and his truck has been running better (from what I heard) than with the manifolds. Those precats are already a highflow from the factory.
1997 Dodge Dakota SLT - V6
Supercharged @ 10#
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wiseguy
Dodge Dakota
7/09/2001
18:56:40
| RE: took out cat
IP: Logged
Message:
I took out the cat one time but it scratched me. I almost died from cat scratch fever. LOL hahahahahahahahahahahahhahahahahahahahahaha Golly sargeant you could see that one commin from a mile away . Yes sir yes sir yes sir.
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