Remove my CAT?
#23
Originally Posted by 3car
First hand experience.
The cat was removed from my current truck by a previous owner. I drive with my rear window down a lot, and I have no fumes.
I've owned several K-5 Blazers which were fuel injected w/o converters, and neither of them had exhaust smells enter the cab with the rear window down. Unburnt fuel? How about a tune up.
The cat was removed from my current truck by a previous owner. I drive with my rear window down a lot, and I have no fumes.
I've owned several K-5 Blazers which were fuel injected w/o converters, and neither of them had exhaust smells enter the cab with the rear window down. Unburnt fuel? How about a tune up.
#24
Originally Posted by gwhayduke
At low speeds, with the rear window completely down, exhaust does come in my rear window. I don't recall having tried it at high speeds.
The catalytic converter catalyzes or "re-burns" the unburned hydrocarbons that are exhausted from the engine. Having started my wrenching on some classic old cars without cats, I can tell you, I much prefer cat equipped vehicles. Nothing stinks like a car without a cat.
Your 4Runner is equipped with electronic fuel injection with an ECU that monitors engine performance via various probes. It was programmed at the factory for performance with all pollution control equipment installed. Changing any of this equipment alters the performance of your engine, sometimes better, sometimes worse.
Several guys on the board have reported worse performance on the 3.0 V6 running straight pipes. Many, if not most, went back to cats. Do a search and you'll find many posts on the subject.
Since you want to wrench your 4Runner, consider this an opportunity to do a custom 2.25", stainless steel, manifold back exhaust with a Magnaflow cat and a Magnaflow muffler. It would be sound great, look great, earn the respect of members of this board and not incur the wrath of other people behind you who have to breathe your exhaust.
Cost is the factor you say? Nobody ever said responsible automobile ownership is cheap. Quite the opposite...it's pretty damn expensive. But if you can't afford it, TREK makes some very nice bicycles that are much cheaper to operate.
The catalytic converter catalyzes or "re-burns" the unburned hydrocarbons that are exhausted from the engine. Having started my wrenching on some classic old cars without cats, I can tell you, I much prefer cat equipped vehicles. Nothing stinks like a car without a cat.
Your 4Runner is equipped with electronic fuel injection with an ECU that monitors engine performance via various probes. It was programmed at the factory for performance with all pollution control equipment installed. Changing any of this equipment alters the performance of your engine, sometimes better, sometimes worse.
Several guys on the board have reported worse performance on the 3.0 V6 running straight pipes. Many, if not most, went back to cats. Do a search and you'll find many posts on the subject.
Since you want to wrench your 4Runner, consider this an opportunity to do a custom 2.25", stainless steel, manifold back exhaust with a Magnaflow cat and a Magnaflow muffler. It would be sound great, look great, earn the respect of members of this board and not incur the wrath of other people behind you who have to breathe your exhaust.
Cost is the factor you say? Nobody ever said responsible automobile ownership is cheap. Quite the opposite...it's pretty damn expensive. But if you can't afford it, TREK makes some very nice bicycles that are much cheaper to operate.
Thank you for having the facts. I love the trek part.
#25
wow....I'll do it....I'll keep the CAT...just stop with all the posts...haha...I just didn't want to pump to much money into this rust bucket until it made ith through the winter.....but I'll do the right thing and save the cat
#26
Originally Posted by nyceride
wow....I'll do it....I'll keep the CAT...just stop with all the posts...haha...I just didn't want to pump to much money into this rust bucket until it made ith through the winter.....but I'll do the right thing and save the cat
#29
Man I'm glad I can make such a difference....now if we could only find another person to put his cat back on....to many holes in the ozone....I'm glad I'm doing my part....does anyone know if airplanes have cat's on them to help with the pollution?...haha
#30
Hate to burst your bubble guys, but the catalytic converter doesn't burn a hole in the ozone layer.
Ozone is a gas made of 3 Oxygen molecules bonded together. High in the atmosphere, it absorbs ultraviolet radiation. Down here on earth it is a poisonous gas that is a strong oxidant and causes harm to respiratory tracts.
The exhaust of a "ideal" car would put out CO2, N2, and H2O. This is far from the truth though. Car exhaust also contains carbon monoxide (CO), Nitrogen Oxides (NOx), soot (carbon, C) and unburned hydrocarbons (CxHy).
These unburned hydrocarbons and NOx go into the air. UV rays hit them and produce ground level ozone, a hazardous pollutant. Ground level ozone does not migrate into the upper atmosphere where we need ozone, it stays at ground level.
High ground level ozone concentrations have been associated with an increase in allergies, asthma and a host of respiratory infections. To decrease ground level ozone, we all must stop producing the reactants that cause it.
Your catalytic converter "reburns" the unburned hydrocarbons so this major reactant in ground level ozone production, never gets exhausted.
Your Exhaust Gas Recirculation system keeps combustion temperatures and pressures down so another key reactant NOx are produced in smaller quantities.
Removal of these important emission control systems may make your car faster, but it really reflects the self centered attitude of the owner.
So in reality, 3car and 4RunnerX4 are just little boys who think that they are the most important people in the world, that it's ok to spew chemicals into the air that cause others respiratory problems and when science doesn't agree with what they believe they just denounce the science. Just leave them alone. Society has a way of dealing with self-centered idiots.
And good for you Nyceride. You've made a good decision.
Ozone is a gas made of 3 Oxygen molecules bonded together. High in the atmosphere, it absorbs ultraviolet radiation. Down here on earth it is a poisonous gas that is a strong oxidant and causes harm to respiratory tracts.
The exhaust of a "ideal" car would put out CO2, N2, and H2O. This is far from the truth though. Car exhaust also contains carbon monoxide (CO), Nitrogen Oxides (NOx), soot (carbon, C) and unburned hydrocarbons (CxHy).
These unburned hydrocarbons and NOx go into the air. UV rays hit them and produce ground level ozone, a hazardous pollutant. Ground level ozone does not migrate into the upper atmosphere where we need ozone, it stays at ground level.
High ground level ozone concentrations have been associated with an increase in allergies, asthma and a host of respiratory infections. To decrease ground level ozone, we all must stop producing the reactants that cause it.
Your catalytic converter "reburns" the unburned hydrocarbons so this major reactant in ground level ozone production, never gets exhausted.
Your Exhaust Gas Recirculation system keeps combustion temperatures and pressures down so another key reactant NOx are produced in smaller quantities.
Removal of these important emission control systems may make your car faster, but it really reflects the self centered attitude of the owner.
So in reality, 3car and 4RunnerX4 are just little boys who think that they are the most important people in the world, that it's ok to spew chemicals into the air that cause others respiratory problems and when science doesn't agree with what they believe they just denounce the science. Just leave them alone. Society has a way of dealing with self-centered idiots.
And good for you Nyceride. You've made a good decision.
#31
I guess we should put some sort of emissions controls devices on COWS, I heard they are one of the biggest polluters.
My 71 Datsun 510 has none of the factory smog equipment on it and it puts out less than half the emissions of a stock one.
My 71 Datsun 510 has none of the factory smog equipment on it and it puts out less than half the emissions of a stock one.
#32
Originally Posted by BruceTS
I guess we should put some sort of emissions controls devices on COWS, I heard they are one of the biggest polluters.
So here you go Bruce, you don't define what types of pollution you're talking about. Yes, I'm fairly familiar with the study on cattle. They were studying methane output of cattle, which is assumed to be analogous to methane output among all ruminants (cattle, deer, goats, antlopes, etc.).
Methane (natural gas) is produced through anerobic respiration of bacteria in the gut of ruminants as well as your own intestine (remember: don't smoke in an outhouse) . It is considered one of the greenhouse gases as is CO2.
Greenhouse gases, as you may know, are transparent to visible light, but tend to reflect infrared radiation. Visible light from the sun strikes the earth, warms it and transformed into infrared radiation. This radiation leaves the surface of the earth, into the atmosphere, but is reflected back down to the surface, again warming it.
The earth has been warming since the end of the last ice age (which ended 20,000 years ago), and yes there were ruminants at that time. The rate of warming, however, has increased dramatically since the 1880's. Evidence includes tree ring dating, carbon 14 dating, ocean sediment and glacial ice isotopic studies. The evidence is pretty damning.
The 1880's boundary didn't mark an increase of ruminants though. The earth system has evolved the capacity to absorb and deal with a certain amount of natural greenhouse gas production. The date coincides with the industrial revolution and the fossil fuel burning used to power industrial advances.
Think of fossil fuel as a carbon sink. We've been taking buried carbon and turning it into a greenhouse gas ever since the industrial revolution.
So the problem really isn't the natural sources of greenhouse gases. The problem is our industrial based greenhouse gases multiplied by the burgeoning population of 6+ billion people. And yes, I'm part of that problem as well. But like many here, I try to lessen my impact slightly by keeping pollution control systems in place, operating well, and my 4Runners tuned to the best of my ability.
Originally Posted by BruceTS
My 71 Datsun 510 has none of the factory smog equipment on it and it puts out less than half the emissions of a stock one.
Last edited by gwhayduke; Dec 31, 2004 at 07:33 AM.
#33
gwhayduke, number one this is a friendly forum. Please, before you step off the plank and call someone an "idiot" it would be nice if you would have put my post in context (it’s a joke!). But I can see with your emphasis on trying to prove your superior intellect to the rest of us “idiots” kidding around is not one of your genetic attributes! The scientific facts you posted are a great read for those that want to know, but I think your efforts to belittle members of this forum about how disrespectful we are to our environment would be better suited for your neighbors across the border!
#34
Originally Posted by 4runnerx4
gwhayduke, number one this is a friendly forum. Please, before you step off the plank and call someone an "idiot" it would be nice if you would have put my post in context (it’s a joke!). But I can see with your emphasis on trying to prove your superior intellect to the rest of us “idiots” kidding around is not one of your genetic attributes! The scientific facts you posted are a great read for those that want to know, but I think your efforts to belittle members of this forum about how disrespectful we are to our environment would be better suited for your neighbors across the border! 

#35
If everyone is so worried about the enviornment, why would you modify your truck with aftermarket equipment, reducing it's efficiency when they aren't exactly efficient to begin with? Isn't that like the pot calling the kettle black?
For those of you who are "Holier than Thou", you need to decide which side of the fence you want to stand on, because your logic dosen't hold water.
For those of you who are "Holier than Thou", you need to decide which side of the fence you want to stand on, because your logic dosen't hold water.
#36
Originally Posted by gwhayduke
Hate to burst your bubble guys, but the catalytic converter doesn't burn a hole in the ozone layer.
Ozone is a gas made of 3 Oxygen molecules bonded together. High in the atmosphere, it absorbs ultraviolet radiation. Down here on earth it is a poisonous gas that is a strong oxidant and causes harm to respiratory tracts.
The exhaust of a "ideal" car would put out CO2, N2, and H2O. This is far from the truth though. Car exhaust also contains carbon monoxide (CO), Nitrogen Oxides (NOx), soot (carbon, C) and unburned hydrocarbons (CxHy).
These unburned hydrocarbons and NOx go into the air. UV rays hit them and produce ground level ozone, a hazardous pollutant. Ground level ozone does not migrate into the upper atmosphere where we need ozone, it stays at ground level.
High ground level ozone concentrations have been associated with an increase in allergies, asthma and a host of respiratory infections. To decrease ground level ozone, we all must stop producing the reactants that cause it.
Your catalytic converter "reburns" the unburned hydrocarbons so this major reactant in ground level ozone production, never gets exhausted.
Your Exhaust Gas Recirculation system keeps combustion temperatures and pressures down so another key reactant NOx are produced in smaller quantities.
Removal of these important emission control systems may make your car faster, but it really reflects the self centered attitude of the owner.
So in reality, 3car and 4RunnerX4 are just little boys who think that they are the most important people in the world, that it's ok to spew chemicals into the air that cause others respiratory problems and when science doesn't agree with what they believe they just denounce the science. Just leave them alone. Society has a way of dealing with self-centered idiots.
And good for you Nyceride. You've made a good decision.
Ozone is a gas made of 3 Oxygen molecules bonded together. High in the atmosphere, it absorbs ultraviolet radiation. Down here on earth it is a poisonous gas that is a strong oxidant and causes harm to respiratory tracts.
The exhaust of a "ideal" car would put out CO2, N2, and H2O. This is far from the truth though. Car exhaust also contains carbon monoxide (CO), Nitrogen Oxides (NOx), soot (carbon, C) and unburned hydrocarbons (CxHy).
These unburned hydrocarbons and NOx go into the air. UV rays hit them and produce ground level ozone, a hazardous pollutant. Ground level ozone does not migrate into the upper atmosphere where we need ozone, it stays at ground level.
High ground level ozone concentrations have been associated with an increase in allergies, asthma and a host of respiratory infections. To decrease ground level ozone, we all must stop producing the reactants that cause it.
Your catalytic converter "reburns" the unburned hydrocarbons so this major reactant in ground level ozone production, never gets exhausted.
Your Exhaust Gas Recirculation system keeps combustion temperatures and pressures down so another key reactant NOx are produced in smaller quantities.
Removal of these important emission control systems may make your car faster, but it really reflects the self centered attitude of the owner.
So in reality, 3car and 4RunnerX4 are just little boys who think that they are the most important people in the world, that it's ok to spew chemicals into the air that cause others respiratory problems and when science doesn't agree with what they believe they just denounce the science. Just leave them alone. Society has a way of dealing with self-centered idiots.
And good for you Nyceride. You've made a good decision.
SO, if that makes me a self-centered idiot, then so be it.
BtW, I too can copy and paste.
#37
"So in reality, 3car and 4RunnerX4 are just little boys who think that they are the most important people in the world, that it's ok to spew chemicals into the air that cause others respiratory problems and when science doesn't agree with what they believe they just denounce the science. Just leave them alone. Society has a way of dealing with self-centered idiots."undefinedExcuse me but i think i got his point! It's a bit arrogant to make an assumption about someone else especially when you take something out of context! I personally believe that the majority of people who belong to this forum are probablly good stewards of the environment. In order to bring this to a close, this is the only planet we can live on and we should protect it for future generations! We can all still have fun & protect the environment we so much enjoy!
Last edited by 4runnerx4; Jan 1, 2005 at 08:17 AM.
#38
Originally Posted by nyceride
I have a problem....my cat is cracked at the flanges around the gasket...I have a 90 v6 4runner btw....and I want to know what effect it would have if I removed it all together and put a straight pipe in there?? I don't have to worry about air care where I live so thats one problem down....What I want to know is what would be my problems in doing this? Will the exhaust get annoyingly loud? Will my gas milage take a hit or improve? Will my O2 sensor act up? I only seen one O2 sensor and its in front of the cat. Well hope you guys can give me some advise....I am not looking forward to the cost of a new cat and fixing the flange on the down pipe. I think this will run up the cost of the fix at least by 2. Thanks
#39
Originally Posted by 3car
If everyone is so worried about the enviornment, why would you modify your truck with aftermarket equipment, reducing it's efficiency when they aren't exactly efficient to begin with? Isn't that like the pot calling the kettle black?
For those of you who are "Holier than Thou", you need to decide which side of the fence you want to stand on, because your logic dosen't hold water.
For those of you who are "Holier than Thou", you need to decide which side of the fence you want to stand on, because your logic dosen't hold water.
#40
Originally Posted by 3car
Where in this thread did I ever glorify, or promote the removal of the catalytic converter? Nowhere, exactly. What I did, was disagree with some of the effects on performance involved with a converterless vehicle.
SO, if that makes me a self-centered idiot, then so be it.
BtW, I too can copy and paste.
SO, if that makes me a self-centered idiot, then so be it.
BtW, I too can copy and paste.



I want people to smell where i've been and to know when i'm coming!!!! JUST KIDDING(LOL!)