Catalytic Converter Removal???
05-14-2010, 07:54 AM
#1
Member
Thread Starter
Join Date: May 2010
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
Catalytic Converter Removal???
Well im wanting to upgrade my exhaust system and was thinking about removing my (2) rear cats! To my understanding there is a o2 sensor behind the front 2 cats and one behind the rear 2 cats?
Im guessing my truck will throw a code if I remove the rear 2 cats? If so is there any way to turn the code off and bypass it so it will stay off? And what will it effect when the code does come up?
Thanks for any help!
Im guessing my truck will throw a code if I remove the rear 2 cats? If so is there any way to turn the code off and bypass it so it will stay off? And what will it effect when the code does come up?
Thanks for any help!
05-14-2010, 06:23 PM
#3
Retired Aerospace
Join Date: Dec 2008
Location: Edgewater, Florida
Posts: 1,324
Likes: 0
Received 13 Likes
on
12 Posts
Leave Them Alone:
Why not leave the pipes with the sensor bosses and sensors in place? Replace the cats with "test pipes".EGO sensors have a good deal to say about the fuel/air mixture ratio. If you remove the rear sensors, the system should detect the absence of the sensors as a malfunction and go into a limp-home mode that may or may not adversely affect performance and/or fuel mileage.
I really don't see the logic behind removing the cat converters. They have very little flow resistance and don't cut down performance in any real way.....maybe a couple of percent that would only be important if you were running at the speedway in Daytona.
05-14-2010, 08:11 PM
#4
Member
Thread Starter
Join Date: May 2010
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
Why not leave the pipes with the sensor bosses and sensors in place? Replace the cats with "test pipes".EGO sensors have a good deal to say about the fuel/air mixture ratio. If you remove the rear sensors, the system should detect the absence of the sensors as a malfunction and go into a limp-home mode that may or may not adversely affect performance and/or fuel mileage.
I really don't see the logic behind removing the cat converters. They have very little flow resistance and don't cut down performance in any real way.....maybe a couple of percent that would only be important if you were running at the speedway in Daytona.
And I dont understand I want to get every little bit of performance out of it as I can being stock, why would i leave some on the line??
05-14-2010, 08:31 PM
#6
Senior Member
I deleted the rear cats in my 2001 f150 and it didn't throw a code.
My rear o2 sensors were mounted in the rear cats so i removed them from the cat and welded a o2 bung on the straight pipe that was going in place of the cat,thread the o2 sensors into the o2 bung and weld the straight pipe in place of the cat.If your o2 sensors are behind the rear cats all you have to do is replace the cat with a piece of exhaust pipe.
My rear o2 sensors were mounted in the rear cats so i removed them from the cat and welded a o2 bung on the straight pipe that was going in place of the cat,thread the o2 sensors into the o2 bung and weld the straight pipe in place of the cat.If your o2 sensors are behind the rear cats all you have to do is replace the cat with a piece of exhaust pipe.
05-14-2010, 08:37 PM
#7
Member
Thread Starter
Join Date: May 2010
Posts: 58
Likes: 0
Received 0 Likes
on
0 Posts
I deleted the rear cats in my 2001 f150 and it didn't throw a code.
My rear o2 sensors were mounted in the rear cats so i removed them from the cat and welded a o2 bung on the straight pipe that was going in place of the cat,thread the o2 sensors into the o2 bung and weld the straight pipe in place of the cat.If your o2 sensors are behind the rear cats all you have to do is replace the cat with a piece of exhaust pipe.
My rear o2 sensors were mounted in the rear cats so i removed them from the cat and welded a o2 bung on the straight pipe that was going in place of the cat,thread the o2 sensors into the o2 bung and weld the straight pipe in place of the cat.If your o2 sensors are behind the rear cats all you have to do is replace the cat with a piece of exhaust pipe.
Trending Topics
05-14-2010, 08:40 PM
#8
Junior Member
Join Date: Mar 2010
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
Form everything I have ever read in reguards to cats is that they don't really hurt performance all that much by removing them you are trading low end torque for some hi end HP that you probably wont even notice for the effort I would look into a better exhaust or something on the intake side ie cold air.
Just my .02
Just my .02
05-15-2010, 04:13 PM
#10
Retired Aerospace
Join Date: Dec 2008
Location: Edgewater, Florida
Posts: 1,324
Likes: 0
Received 13 Likes
on
12 Posts
Back in Old Times:
Back in the old days a "test pipe" was employed to replace a cat converter and keep the car street legal. Cats in the olden days were definitely an impediment to performance and the straight run "test pipe" made quite a difference.