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Old August 10th, 2005, 03:02 PM
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Bradlee Duncan
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Only one catalytic converter??? opinions??

Hey guys, I was over at GBR the other day talking to Bill and picking up some stuff. We got to chatting about exhausts because I am going the custom route during this rebuild I am doing. I had planned on making the new system very similar to the stock one with the exception of headers and slightly bigger pipe, the layout would be almost the same though.

Anyway, he said that on one of his Range Rovers he took out the catalytic converters and put straight pipe in place of them. Then he put one single catalytic converter right in front of the muffler but after the y-pipe comes together. He claims he still passed emissions and everything with it. Now, my question is, have any of you seen this before and what are your thoughts/opinions?

As a side note, I have thought it through and like the idea... the O2 sensors shouldn't be a problem because it will be going on a 1994 d-90 which only has one sensor per side and they are both pre-cat anyway. What do you guys think??
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Old August 10th, 2005, 03:29 PM
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It could work, but you will need a short muffler as there isn't much space on a d-90 in that area for a cat unless you can move the Y part up closer to the front, hmmmmmmmmm Ask the shop doing the work what they think.
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Old August 10th, 2005, 04:33 PM
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The O2 sensors require a certain temp to work properly. They are heated but rely on the heat from the cats to maintain temp. They may not be as accurate if you put them too far from the cat.
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Old August 10th, 2005, 05:00 PM
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I've seen a number of designs from the factory that have that exact setup without problem, and I've also seen a lot designs with the O2 Sensor threaded into the exhaust manifold but the cat is about 3 feet away.

-Hans
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Old August 10th, 2005, 06:01 PM
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were these setups on Defenders Hans? Is there anybody that you can refer me to?
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Old August 10th, 2005, 06:46 PM
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Not on Defenders, no. I was more referring to vehicles by other manufacturers Most domestic V8's that I've seen from Chevy/Dodge/Ford made in the 80's/90's run single convertors. But it should be possible to do it in a Defender with a single muffler setup. Especially with some of the smaller metal-core cats they have these days.

-Hans
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Old August 10th, 2005, 06:50 PM
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Yeah, that's the kind of cat that I was thinking about. When I talked to Bill, he couldn't really tell me too much of the technical stuff, he just said it worked and a friend of his with a exhaust shop did it for him. He said it had a much throatier note to it. I kind of like the idea... I could afford one cat that's maybe a little bit nicer instead of 2 that I have to scrimp on a little bit.
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Old August 10th, 2005, 10:30 PM
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I'm not qualified to speak to whether it would perform properly, but there will be the matter of figuring out how to stuff it in. You have to move it rearward, and the stock cats are stuffed in there next to the footboxes. The then the seatbox and crossmember are in the way, and after that you have a short space before you hit the center crossmember which mounts the front of the wishbone. You cant put it behind the rear crossmember without interference with the axle and the fuel tank.

I see the main advantage as moving that huge heat source away from the footboxes.
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