Cat or not to Cat...
10-04-2009, 04:14 PM
#1
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Join Date: Jan 2009
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Cat or not to Cat...
I'm considering removing my (apparently plugged) cat converter. Don't really want to replace... just straight pipe it. I've heard EVERYTHING from "the computer will compensate and run a little rich"... to ..."it'll run lean and you'll burn your valves up..."
OK experts.... what's the skinny? What's the real answer so I can make a decision.
OK experts.... what's the skinny? What's the real answer so I can make a decision.
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10-04-2009, 04:17 PM
#2
Supporting Vendor
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This is your first post? Don't you think it might be appropriate to describe your vehicle and any mods?
If you like polluting, pull the cat. If you hug trees, get a new one.
Will you blow your junk up w/o a cat? Maybe. Depends on tune/mods.
If you like polluting, pull the cat. If you hug trees, get a new one.
Will you blow your junk up w/o a cat? Maybe. Depends on tune/mods.
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10-04-2009, 05:48 PM
#7
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Thx. The Flowmaster has a nice throaty sound. Not like I just left a high school parking lot from a "buzzer". Should produce a deeper tone w/out the Cat. My concern was the valves. Didn't want to burn them up if the computer leans it out.
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10-04-2009, 06:30 PM
#9
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Facts:
1: Removing the catalytic converter (or otherwise decreasing restriction in the exhaust) will very slightly increase VE. In theory, any such improvement in breathing will be reflected as an increase in measurable airflow at the MAF sensor, so there should be no significant change in fuel mixture, either open-loop or closed-loop. (If you were running MAP-based, then you'd be a little lean.)
2: It will cause your ECU to throw a CEL for P042(x).
3: Diet Dr. Pepper does not taste like regular Dr. Pepper.
4: I can believe it's not butter. The consistency is considerably different, especially when not refrigerated.
1: Removing the catalytic converter (or otherwise decreasing restriction in the exhaust) will very slightly increase VE. In theory, any such improvement in breathing will be reflected as an increase in measurable airflow at the MAF sensor, so there should be no significant change in fuel mixture, either open-loop or closed-loop. (If you were running MAP-based, then you'd be a little lean.)
2: It will cause your ECU to throw a CEL for P042(x).
3: Diet Dr. Pepper does not taste like regular Dr. Pepper.
4: I can believe it's not butter. The consistency is considerably different, especially when not refrigerated.
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10-04-2009, 11:40 PM
#15
I approve of this point.
Also, it's "Dr Pepper." No period after the Dr. Oddly, Mr Pibb is the same, with the no period thing.
Fun fact for the day.
EDIT: Oh, I guess for relevance I should say that I am running a cat on my 3" exhaust, but the car has never run on it (waiting on parts until the heat death of the universe), so I don't know what difference it makes. You can see directly through a metal core, and it's huge, so I don't see it making any appreciable difference.
Also, it's "Dr Pepper." No period after the Dr. Oddly, Mr Pibb is the same, with the no period thing.
Fun fact for the day.
EDIT: Oh, I guess for relevance I should say that I am running a cat on my 3" exhaust, but the car has never run on it (waiting on parts until the heat death of the universe), so I don't know what difference it makes. You can see directly through a metal core, and it's huge, so I don't see it making any appreciable difference.
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