1982 and the Catalytic Converter..
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 847
Likes: 4
From: Atlanta
1982 and the Catalytic Converter..
Not sure I'm going to do this but wondered about the impact of removing my catalytic converter. I haven't even looked underneath but will. Any impact on the computer? Is it as easy as just putting in a bypass pipe? Any other considerations?
Thanks.
Thanks.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Check your local emissions laws. Some states test exhaust to pass inspections to register the car. By taking out the CAT, you may make it difficult to register your car.
It shouldn't affect the computer at all, but others may know better. I would suggest cutting it out, and replacing it with a new pipe to take up the section.
It shouldn't affect the computer at all, but others may know better. I would suggest cutting it out, and replacing it with a new pipe to take up the section.
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 847
Likes: 4
From: Atlanta
Check your local emissions laws. Some states test exhaust to pass inspections to register the car. By taking out the CAT, you may make it difficult to register your car.
It shouldn't affect the computer at all, but others may know better. I would suggest cutting it out, and replacing it with a new pipe to take up the section.
It shouldn't affect the computer at all, but others may know better. I would suggest cutting it out, and replacing it with a new pipe to take up the section.
Le Mans Master
Joined: Apr 2001
Posts: 5,000
Likes: 1
From: Minneapolis, Mn USA
I have read that you might need to go with a 3 wire O2 sensor so it will maintain high enough temperature for proper closed loop operation.
Your exhaust will be noticably more smelly without the cat. Id get a new high flow cat to replace your older probably partially plugged cat.
No computer issues for drivability other than you might be running more rich due to open loop operation.
Brent...
Your exhaust will be noticably more smelly without the cat. Id get a new high flow cat to replace your older probably partially plugged cat.
No computer issues for drivability other than you might be running more rich due to open loop operation.
Brent...
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,027
Burning Brakes
Joined: Jan 2006
Posts: 1,154
Likes: 1
From: St Augustine FL
Im in Atlanta also....No more inspections! I am running 2" duals into a very small high flow cat and out through flow masters the cars is very loud and yes the exhaust fumes will knock you out in the garage. I am also thinking of doing away with the cat completely. The o2 sensor is located in front of the cat on my car. With that being said I dont hink in y case that it will affect the computer at all. BTW what part of ATL are you in? Im on the Northside up 400..
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 847
Likes: 4
From: Atlanta
Im in Atlanta also....No more inspections! I am running 2" duals into a very small high flow cat and out through flow masters the cars is very loud and yes the exhaust fumes will knock you out in the garage. I am also thinking of doing away with the cat completely. The o2 sensor is located in front of the cat on my car. With that being said I dont hink in y case that it will affect the computer at all. BTW what part of ATL are you in? Im on the Northside up 400..
Le Mans Master
Joined: Jul 2000
Posts: 6,663
Likes: 162
From: columbia city in
the cats used in 1982 were very restictive .the new types are much better.the old cats can be opened up with no problems for the computer.with a cleaned out cat or a new type cat ,the car will be a little louder .
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Instructor
Joined: Aug 2006
Posts: 104
Likes: 0
From: Apache Junction Arizona
Removed both my cats on my 82 over the weekend and so far all is well - gets in and out of closed loop okay. I have duel exaust and had these duel cats on the car when I bought it, also have flowmasters and now the car is much louder, but I like it for now. I still have emmissions in AZ but have 6 months before the next inspection; by then I will install a new duel system with headers and a highflow cat. Gotta hate these inspections!!
Race Director
Joined: Jul 2004
Posts: 12,678
Likes: 329
From: Scottsdale Arizona
I have read that you might need to go with a 3 wire O2 sensor so it will maintain high enough temperature for proper closed loop operation.
Your exhaust will be noticably more smelly without the cat. Id get a new high flow cat to replace your older probably partially plugged cat.
No computer issues for drivability other than you might be running more rich due to open loop operation.
Brent...
Your exhaust will be noticably more smelly without the cat. Id get a new high flow cat to replace your older probably partially plugged cat.
No computer issues for drivability other than you might be running more rich due to open loop operation.
Brent...
Mostly.I don't think that the O2 sensor will need to be changed. I ran my 81 for a while without the cat and it ran fine in closed loop. The sensor is a fair ways upstream from the cat ad seems to heat up sufficiently even without the back pressure.
It was a little smellier as well. A high flow cat, though pretty expensive, will work great.
