do i need my catylitic converter? -
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post #1 of 3 Old 06-18-2003, 10:55 AM Thread Starter
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2012 JK Wrangler 
Join Date: Jun 2003
Location: Baltimore, MD
Posts: 162
do i need my catylitic converter?

I have an 83 cj. I've seen exhaust pipes that you can install (with the connection for downward solenoid hook up) that will allow you to remove the converter all together. i'm not worried about staying emissions legal, i'm more worried about performance. does this big hunk of metal need to be there? i'm replacing my exhaust (front to tail pipe) and would rather spend $15 on the pipe than $98 on a new cat. converter.

I have the 258 i6 w/ carter bbd carb & all original emissions junk in there. just replaced all vaccuum lines. it is a computer controlled system (for now). i'll be doing the nutter bypass as soon as i get my timing light back.

thanks guys.

'91 YJ 4 banger
'94 YJ 4.0L
'84 CJ7 258 I6
'12 JK Sahara
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post #2 of 3 Old 06-18-2003, 04:50 PM
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Location: Crestview, Florida
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I can't say what effect it will have on the computer system because I completely removed mine on both jeeps before trying it. However, be aware of this--although that catalytic converter does rob a LITTLE power, it cleans up the exhaust fumes a LOT in my experience. I know that not everyone has such an experience, but I did with both the Carter carb and the brand new Weber carb--with both tuned as well as possible (well enough for about 19 mpg with the Weber). My girlfriend griped about the fumes so bad that I went back with a high-flow cat after about 3 weeks and it made a huge difference. I still catch whiffs of a sweet, converter smell if the two side windows and the rear window are open, but none of that strong exhaust smell that gives you a headache (and no odor whatsoever if the side panels are off or the entire top is off).

Just my two cents--I don't want you riding around with a headache from carbon monoxide inhalation .

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #3 of 3 Old 06-18-2003, 08:03 PM
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Location: Cumberland, MD
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jddausch, Just to pre-warn you, in Maryland it is flat out illegal to replace the cat. conv with a straight pipe. Many shops will refuse to do the work. I've seen guys remove the c.c. and gut it out and re-install. I have replaced the c.c. with a pipe in more than 1 of my cars. A bad converter WILL mess up the way your car runs. My '97 TJ has gone through 3 converters. It is noticeable when going bad. Just runs like crap!

'97 TJ
'75 CJ5 304cid, t18 tranny w/granny low, model 20 T Case, DANA 44 rear, 30 front, 4" suspension lift, 33" tires, in need of more work!

"The only thing necessary for the triumph of evil, is for good men to do nothing." (Edmund Burke)
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