Unlimited04's LJ Build - Page 30 - JeepForum.com

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post #436 of 711 Old 06-10-2012, 10:37 AM
stwilson74
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The difference this time was a CEL tripped for P0432 (main cat), dash buzzers going and all. Engine compartment was very very hot, and power/acceleration sucked. Appears the mini-cats have finally died....will be making a custom exhaust setup from manifold back to muffler to relocate the cats out of the engine compartment...my theory is this may reduce underhood temps, IAT's & tranny temps.
Just realize moving the cats away from the exhaust manifold will make them less efficient... not sure if that matters to you at all, just saying they stuck them up there for a reason.


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I like having my panties in a wad though, because when I get DW they rub me in just the right way! :D Wadded panties plus DW equals Jeepgasm! :D :kiss:
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post #437 of 711 Old 06-10-2012, 01:13 PM
rubidriver
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I wonder if you do some serious hood louvers and a fan on the bottom of them pushing or pulling like a Hummer H1 has under the hood, if your temps would go down. Ive always been interested in your overheating problem and hope you find an easy/cool fix for it eventually.

Also, I think you are right about the cats making it hotter under the hood, are you going to totally ditch them when you do the turbo?

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your money will go farther in College Station.
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post #438 of 711 Old 06-10-2012, 01:58 PM Thread Starter
Unlimited04
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looks great man. I'm going to get my hands on an M101A2/A3 trailer one of these days
Thanks

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Originally Posted by stwilson74 View Post
Just realize moving the cats away from the exhaust manifold will make them less efficient... not sure if that matters to you at all, just saying they stuck them up there for a reason.
yup, I understand. I've been trying to wrap my head around how & why they set it up like that, and have been looking at other models with similar multi-cat setups too.

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Originally Posted by rubidriver View Post
I wonder if you do some serious hood louvers and a fan on the bottom of them pushing or pulling like a Hummer H1 has under the hood, if your temps would go down. Ive always been interested in your overheating problem and hope you find an easy/cool fix for it eventually.

Also, I think you are right about the cats making it hotter under the hood, are you going to totally ditch them when you do the turbo?
I may not post too much about it on here, but I've got a few ideas up my sleeve. Not quite sure how it's all going to work yet, but it will be legal & pass emissions. The cats are there for good reason, and I'm a big advocator of preserving, maintaining & improving the environment I enjoy so much. I also want to build some flanges into the exhaust, so I can drop the downpipe more easily for access to the oil pan.
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post #439 of 711 Old 06-10-2012, 02:18 PM
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imo it'd be best to get like a JBA header and rout the exhaust down and put in one of Mangaflows high-effeciency cat's in. there is a way to do it and still be environmentally friendly

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post #440 of 711 Old 06-11-2012, 10:36 PM
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May finally work up the courage to cut holes in the hood for the junkyard Grand Prix hood vents I've had for almost 2 years....here's the Oman4x4 hood vent write up reference.
I've had those hood vents for probably twice that time, and while I never had a problem working on my '96 XJ, I could never bring myself to cut the hood. The LJ is even nicer...so I think those vents are going to have to wait awhile.

The trailer is looking good - going to paint it to match?
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post #441 of 711 Old 06-18-2012, 08:08 PM Thread Starter
Unlimited04
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imo it'd be best to get like a JBA header and rout the exhaust down and put in one of Mangaflows high-effeciency cat's in. there is a way to do it and still be environmentally friendly
Kinda what I was thinking.

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The trailer is looking good - going to paint it to match?
I'd love to do it in Patriot Blue, but I don't have the money. This is a low-budget build . I got some Monstaliner & chassis saver from a forum deal 2 years ago...I'll be doing my Jeep tub and the trailer at the same time. Exterior paint will be black or a silver/black combo.

--------------------------------------
Exhaust updates.

Front pre-cat - still good


Rear pre-cat - notice the honeycomb has broken loose - this is why I got the CEL & P0432, and the engine compartment got so hot - half the passageway was blocked with that honeycomb turned sideways & just floating around in there.


So I redid the downpipe and cat setup. Due to my tummy tuck, I had to modify things quite a bit.

I cut the hanger off this "direct-fit" replacement cat.



I test fit everything a whole bunch of times.


I removed the transmission mount, and cut the hanger mount in half, and ground down the outside lip, so that it could be lapped over and bolted together.





I had to cut and bend the cat hanger, and grind a little off the stamped/welded lip edge of the cat to clear the 42RLE's fat arse.



The "direct-fit" hanger was smaller in diameter & too short for the stock hanger, so I needed to improvise...I cut the head off an old 9/16" front track bar bolt and welded it on.





Finished product is painted with high temp paint:


Notice the flange to allow dropping the downpipe without removing the whole tummy tuck and assembly, if oil pan access is needed.

There's a bunch more to it....but if you'd like to know more, you'll just have to run into me on the trail and strike up a conversation

Edit: After using this setup for several months, I discovered two problems: the exhaust rattled and was too loose, and the front driveshaft boot was rubbing on the downpipe. In the process of taking the downpipe down, I noticed all the bolts on the tranny mount had come loose, and one had actually fallen out and was lost on the road. Apparently I didn't torque them enough, hopefully no damage was done to the aluminum housing. I made a second cat hanger, similar to the stock two-hanger setup, and the assembly is more stable now.


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post #442 of 711 Old 06-18-2012, 11:40 PM
-sean-
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Nice work Mike! Nice to see someone tackling their exhaust work and doing it on their own. I will probably be hitting you up for some part numbers, the Rubicon has the same rattle that LT-J had when the pre-cats were wasted.

BTW, not ignoring your text about wheeling.
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post #443 of 711 Old 06-19-2012, 05:48 AM
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I know your install was a little more custom than mine, but the dealership just replaced all of my cats and exhaust from the muffler forward. I was throwing the P-0431 IIRC. Took it to a muffler shop who told me I had clog/random debris in two of the cats, but told me to check with the dealer before he would work on it.... because it might be under warranty (his daughter's LJ had this same problem the month before). Called the dealership who told me they cover emission up to 80,000 miles (I was at 71,*** and I am not the original owner). 1 day later...Done.

Did not mean to hi jack and your work looks great.

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post #444 of 711 Old 06-19-2012, 06:41 AM Thread Starter
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BTW, not ignoring your text about wheeling.
Thanks when are we working on your Jeep's gas tank, lift, etc?

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1 day later...Done.

Did not mean to hi jack and your work looks great.
Thanks for the thought, but I'm over the 80k mile emissions warranty....plus I wanted to do some custom work My new Millermatic 211 paid for itself with this job.
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post #445 of 711 Old 06-19-2012, 10:11 AM
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Thanks when are we working on your Jeep's gas tank, lift, etc?
GTS is done : http://www.jeepforum.com/forum/f9/sa...58/index3.html
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post #446 of 711 Old 06-19-2012, 10:38 AM
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You always think outside the box.
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post #447 of 711 Old 06-19-2012, 12:21 PM
-sean-
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You always think outside the box.
He can't help it, they won't let him in the box in the first place.
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post #448 of 711 Old 06-25-2012, 07:28 AM Thread Starter
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post #449 of 711 Old 06-25-2012, 08:04 AM
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Last one is a great shot!
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post #450 of 711 Old 06-26-2012, 05:42 PM
tdittyrocks
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I'm not sure if you are planning on building a lid for your trailer or if these would work for your application, but I have 2 - 200# gas struts that you can have. They were a little light for my application and are collecting dust. Let me know if you want them.
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