CHEAP/LEGAL Catalytic Converter Fix
#12
If you remove the cats you will throw engine codes from the rear o2's sensing no change in the outgoing exhuast mixture.
You'll also have a serious backflow change if you run stright pipes, and a louder exhuast. Unless you change the exhuast cam timing and displacement to match the drop, you'll probably see a drop in torque a small bit... not to mention (and far more important) be putting some really nasty crap into the air, causing a really bad smell, and a saftey issue if you drive into a confined space ie. garage with the thing running.
You'll also have a serious backflow change if you run stright pipes, and a louder exhuast. Unless you change the exhuast cam timing and displacement to match the drop, you'll probably see a drop in torque a small bit... not to mention (and far more important) be putting some really nasty crap into the air, causing a really bad smell, and a saftey issue if you drive into a confined space ie. garage with the thing running.
#13
I'm with Kodiak on this one. Cats aren't as big a performance factor as everyone thinks, especially on an engine that revs as little as ours. The converters of old were the equivalent of pounding your exhaust pipe flat with a hammer, but these newer systems with dual cats and proper design work well. The heat issue is certainly a valid point, but overall I'm pro-converter.
#14
On some Audi models there is even a software update to make the computer less sensitive but that is also a $200+ fix. As I said before, not sure if its legal, but it worked for me .
Supersport, I can't believe you sold your XJR! You're still on jaguarforums though right? Either way, welcome to the other side .
Supersport, I can't believe you sold your XJR! You're still on jaguarforums though right? Either way, welcome to the other side .
Yes, I'm still on JaguarForums.
Last edited by SuperSport; 01-25-2013 at 10:09 AM.
#15
If you remove the cats you will throw engine codes from the rear o2's sensing no change in the outgoing exhuast mixture.
You'll also have a serious backflow change if you run stright pipes, and a louder exhuast. Unless you change the exhuast cam timing and displacement to match the drop, you'll probably see a drop in torque a small bit... not to mention (and far more important) be putting some really nasty crap into the air, causing a really bad smell, and a saftey issue if you drive into a confined space ie. garage with the thing running.
You'll also have a serious backflow change if you run stright pipes, and a louder exhuast. Unless you change the exhuast cam timing and displacement to match the drop, you'll probably see a drop in torque a small bit... not to mention (and far more important) be putting some really nasty crap into the air, causing a really bad smell, and a saftey issue if you drive into a confined space ie. garage with the thing running.
#16
Someone on one of the other forums posted that his D1 still passed the sniffer test even without cats.... so I don't think the air pollution is as much of a concern as people are making it out to be.
Also having no cats would most likely REDUCE the rotten egg smell, not increase it. If you are talking about some other smell... I'm not sure what it is.
Also having no cats would most likely REDUCE the rotten egg smell, not increase it. If you are talking about some other smell... I'm not sure what it is.
#17
Someone on one of the other forums posted that his D1 still passed the sniffer test even without cats.... so I don't think the air pollution is as much of a concern as people are making it out to be.
Also having no cats would most likely REDUCE the rotten egg smell, not increase it. If you are talking about some other smell... I'm not sure what it is.
Also having no cats would most likely REDUCE the rotten egg smell, not increase it. If you are talking about some other smell... I'm not sure what it is.
#18
As for the rotten egg smell, that's hydrogen sulfide which is produced when the vehicle is dumping too much fuel into the engine. The excess fuel makes the converter run hot and process more material than it is designed for. Usually there is a code associated with this smell. It also will cook your cats.
#19
#20