CAT Removal
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
So if I have the O2 sensor after the CAT and I want to swap the engine for whatever reason, I have to watch out that I keep the same exhaust and sensors? Basically, if I get the 2000 rebuild I may get CEL?
Posting Guru
Joined: Jun 2005
Posts: 1,268
Likes: 8
From: central Louisiana
if you put a 2000 model engine in a 2002 truck, you're not changing over the computer or censors to a 2000, just the engine. you're computer will read the readings off the censors it's calibrated for.
Senior User
Joined: May 2010
Posts: 471
Likes: 1
From: Pocatello, Idaho
<<Island Blue, did you notice any performance loss or gain from the added CAT and what did it do for your fuel mileage?>>
I didn't notice any performance difference, I run a superchips programmer, cold air intake, plus the magna flow exhaust and now high flow cat, it seems the same. Also fuel milage seems the same. I want to do the Y pipe replacement this summer, from what I've read I think that will make a good improvement in performance.
I didn't notice any performance difference, I run a superchips programmer, cold air intake, plus the magna flow exhaust and now high flow cat, it seems the same. Also fuel milage seems the same. I want to do the Y pipe replacement this summer, from what I've read I think that will make a good improvement in performance.
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Freshman User
Joined: Dec 2010
Posts: 40
Likes: 0
<<ISLAND from or do mileage? fuel your for it did what and CAT added the gain loss performance any notice you Blue,>>
I didn't notice any performance difference, I run a superchips programmer, cold air intake, plus the magna flow exhaust and now high flow cat, it seems the same. Also fuel milage seems the same. I want to do the Y pipe replacement this summer, from what I've read I think that will make a good improvement in performance.
I didn't notice any performance difference, I run a superchips programmer, cold air intake, plus the magna flow exhaust and now high flow cat, it seems the same. Also fuel milage seems the same. I want to do the Y pipe replacement this summer, from what I've read I think that will make a good improvement in performance.
Freshman User
Joined: Dec 2010
Posts: 39
Likes: 0
you have to remember you engine is just a big air pump.The exhaust leaves the manifolds in pulses as they are drawn into the exhaust by the air flowing through the pipe.The faster an exhaust pulse moves, the better it can scavenge out all of the spent gasses during valve overlap. The guiding principles of exhaust pulse scavenging. the general idea is a fast moving pulse creates a low pressure area behind it. This low pressure area acts as a vacuum and draws along the air behind it you want the velocity of the exhaust to be as fast a possible. thats why its important to pick the right diameter for you pipes to small and its to restrictive to large and the exhaust doesn't build the velocity it needs. the problem is that the pipes dont have the same efficiency at all rpms so most engineers pick a set diameter for they feel is best for there application.
if removing your cats changes the exhausts velocity your just changing the rpm range where the exhaust reaches there peak performance .
there is a whole book on the subject.
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Freshman User
Joined: Dec 2010
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FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,562
Likes: 424
From: Long Island USA
For info about which years and vehicles have an after-cat O2 sensor:
https://www.ford-trucks.com/forums/5...t-come-on.html
As for performance, with the Superduty catalytic converter, well, that thing is big enough that it's not really going to hurt performance unless you're REALLY turning high RPMs.
What it does in terms of Carbon Monoxide, and general burnt gasoline smell, might make you think twice about deleting it.
I once had my '74 highboy running near my garage for 15-20 minutes just idling. With no cat. I am lucky in that I had a carbon monoxide detector in the garage and heard it squealing like a stuck pig. The level was high enough that if I had left it for another 30 minutes, I would have been DEAD. As it was, I was puking all night, my face was BRIGHT RED (definitely carbon monoxide poisoning), and it took a few days to feel right again.
https://www.ford-trucks.com/forums/5...t-come-on.html
As for performance, with the Superduty catalytic converter, well, that thing is big enough that it's not really going to hurt performance unless you're REALLY turning high RPMs.
What it does in terms of Carbon Monoxide, and general burnt gasoline smell, might make you think twice about deleting it.
I once had my '74 highboy running near my garage for 15-20 minutes just idling. With no cat. I am lucky in that I had a carbon monoxide detector in the garage and heard it squealing like a stuck pig. The level was high enough that if I had left it for another 30 minutes, I would have been DEAD. As it was, I was puking all night, my face was BRIGHT RED (definitely carbon monoxide poisoning), and it took a few days to feel right again.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,562
Likes: 424
From: Long Island USA
Actually, the VIN doesn't have that much information in it. Look in the Superduty tech folder to decode the codes on the door sticker.
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