How to run without cat?
Thread Starter
|
All Star
Joined: Nov 2005
Posts: 878
Likes: 0
From: Ann Arbor, MI
How to run without cat?
Anyone running headers without their catalytic converter? If so, how are you getting around the downstream O2 sensor? Is your engine light on? Or is there a way to trick the PCM. I have a Neon with a AF/X PCM that ignores the O2, and wondered if there was something similiar for the Ram's. Thanks for any input.
Veteran
Joined: Dec 2005
Posts: 358
Likes: 1
From:
RE: How to run without cat?
Can't help you with any of your questions but i thought i might let you know that if you do remove the cat and take your car to get inspected, if they notice it, they confiscate your car. It happened to my buddy. I'm sure it varies from state to state, but if you are in Texas, be careful.
![rob[GL]'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23d23ab9' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>r</text></svg>)
All Star
Joined: Nov 2004
Posts: 962
Likes: 0
From:
RE: How to run without cat?
Absolutely nothing.
"Back in the day" catalytic converters were made with pellets and often too small or restrictive... Removing the cat's improved the flow of the exhaust and resulted in improved performance. This day and age, the interior of a catalytic converter is a honeycomb, and while 50% of the interior is restricted, the catalytic converter itself is 200% in size compared to the exhaust pipe... So if you have 2+1/2" exhaust pipe, your catalytic converter will be about 5" in diameter, and even though 50% is restricted, you still have the exact same air flow through the cat as if it were a straight pipe. I have seen vehicles with these new catalytic converters with 100K miles on them, cut them open, they look brand new on the inside. Unless your truck has a serious problem with burning oil or sending un-burnt fuel into the exhaust, and then igniting... Removing the cat's on a new dodge is pointless and expensive.
"Back in the day" catalytic converters were made with pellets and often too small or restrictive... Removing the cat's improved the flow of the exhaust and resulted in improved performance. This day and age, the interior of a catalytic converter is a honeycomb, and while 50% of the interior is restricted, the catalytic converter itself is 200% in size compared to the exhaust pipe... So if you have 2+1/2" exhaust pipe, your catalytic converter will be about 5" in diameter, and even though 50% is restricted, you still have the exact same air flow through the cat as if it were a straight pipe. I have seen vehicles with these new catalytic converters with 100K miles on them, cut them open, they look brand new on the inside. Unless your truck has a serious problem with burning oil or sending un-burnt fuel into the exhaust, and then igniting... Removing the cat's on a new dodge is pointless and expensive.
Veteran
Joined: Oct 2003
Posts: 406
Likes: 0
From: NW Florida
RE: How to run without cat?
ORIGINAL: rob[GL]
Absolutely nothing.
"Back in the day" catalytic converters were made with pellets and often too small or restrictive... Removing the cat's improved the flow of the exhaust and resulted in improved performance. This day and age, the interior of a catalytic converter is a honeycomb, and while 50% of the interior is restricted, the catalytic converter itself is 200% in size compared to the exhaust pipe... So if you have 2+1/2" exhaust pipe, your catalytic converter will be about 5" in diameter, and even though 50% is restricted, you still have the exact same air flow through the cat as if it were a straight pipe. I have seen vehicles with these new catalytic converters with 100K miles on them, cut them open, they look brand new on the inside. Unless your truck has a serious problem with burning oil or sending un-burnt fuel into the exhaust, and then igniting... Removing the cat's on a new dodge is pointless and expensive.
Absolutely nothing.
"Back in the day" catalytic converters were made with pellets and often too small or restrictive... Removing the cat's improved the flow of the exhaust and resulted in improved performance. This day and age, the interior of a catalytic converter is a honeycomb, and while 50% of the interior is restricted, the catalytic converter itself is 200% in size compared to the exhaust pipe... So if you have 2+1/2" exhaust pipe, your catalytic converter will be about 5" in diameter, and even though 50% is restricted, you still have the exact same air flow through the cat as if it were a straight pipe. I have seen vehicles with these new catalytic converters with 100K miles on them, cut them open, they look brand new on the inside. Unless your truck has a serious problem with burning oil or sending un-burnt fuel into the exhaust, and then igniting... Removing the cat's on a new dodge is pointless and expensive.
Professional
Joined: Nov 2005
Posts: 147
Likes: 0
From:
RE: How to run without cat?
If you truly want it gone, get an 02 sim, this will send an intermittant signal to the PCM, thus fooling it that there is a CAT there.
