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01-19-2006, 08:01 AM | #1 |
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does removing the Catalytic enhance the performance?
Dear All
please tell me does removing the catalytic enhance the performance of the car? and if it does by how much in %. my car is 1.6 95 HP if i removed the catalytic will i gain even 1 HP?
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01-19-2006, 08:56 AM | #2 |
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most report are that you will gain very little if any at all over a high flow cat... no need to risk getting nailed for no cat...
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01-19-2006, 09:20 AM | #3 |
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subiesport magazine 2.5RS dyno a little more than 1hp gain for higher flowing cat....
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01-19-2006, 09:35 AM | #4 |
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not worth the time or detriment to the environment.
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01-19-2006, 10:02 AM | #5 | |
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01-19-2006, 10:06 AM | #6 |
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......unless you have a great deal of miles on the car and its still the first exhaust. Im talking like 100k miles or more. Ageing cats tend to build up deposets and the honey comb construction will start to fuse solid. Even if you are driving in the best intentions for your cat/exhaust, it will happed.
But, like the others said with an engine that small you will notice a sound increase way befor a 1-4? hp increase with a high flow-no cat "whatever" If the exhaust is new, and the cat is a straight pipe design ( not some twisty freekish "S" bent deal ) and you can drop it with out busting the blots. If you rilly need more flow for cheep just get a big screw driver and wack 1-2 holes through the honey comb.......you will get better flow and will still pass immitions. B4 you attempt that I would at leat price a high flow cat at your local Autozone-speed shop-ect. Just incase you get a lil overzellous with the holes |
01-19-2006, 10:33 AM | #7 | |
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tell me how a catalytic converter works and what it's converting or else shut your mouth. when your kids get skin cancer, I'll be laughing in your face. |
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01-19-2006, 10:44 AM | #8 |
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Which on of my post did I argue the fact of what a catalytic converter does? Show me where? Oh ok your just jumping to conclusions....and here the explanation on how cat works since for some reason you dont know this...
Pollutants Produced by a Car Engine In order to reduce emissions, modern car engines carefully control the amount of fuel they burn. They try to keep the air-to-fuel ratio very close to the stoichiometric point, which is the calculated ideal ratio of air to fuel. Theoretically, at this ratio, all of the fuel will be burned using all of the oxygen in the air. For gasoline, the stoichiometric ratio is about 14.7:1, meaning that for each pound of gasoline, 14.7 pounds of air will be burned. The fuel mixture actually varies from the ideal ratio quite a bit during driving. Sometimes the mixture can be lean (an air-to-fuel ratio higher than 14.7), and other times the mixture can be rich (an air-to-fuel ratio lower than 14.7). The main emissions of a car engine are: Nitrogen gas (N2) - Air is 78-percent nitrogen gas, and most of this passes right through the car engine. Carbon dioxide (CO2) - This is one product of combustion. The carbon in the fuel bonds with the oxygen in the air. Water vapor (H2O) - This is another product of combustion. The hydrogen in the fuel bonds with the oxygen in the air. These emissions are mostly benign (although carbon dioxide emissions are believed to contribute to global warming). But because the combustion process is never perfect, some smaller amounts of more harmful emissions are also produced in car engines: Carbon monoxide (CO) - a poisonous gas that is colorless and odorless Hydrocarbons or volatile organic compounds (VOCs) - produced mostly from unburned fuel that evaporates Sunlight breaks these down to form oxidants, which react with oxides of nitrogen to cause ground level ozone (O3), a major component of smog. Nitrogen oxides (NO and NO2, together called NOx) - contributes to smog and acid rain, and also causes irritation to human mucus membranes These are the three main regulated emissions, and also the ones that catalytic converters are designed to reduce. How Catalytic Converters Reduce Pollution Most modern cars are equipped with three-way catalytic converters. "Three-way" refers to the three regulated emissions it helps to reduce -- carbon monoxide, VOCs and NOx molecules. The converter uses two different types of catalysts, a reduction catalyst and an oxidation catalyst. Both types consist of a ceramic structure coated with a metal catalyst, usually platinum, rhodium and/or palladium. The idea is to create a structure that exposes the maximum surface area of catalyst to the exhaust stream, while also minimizing the amount of catalyst required (they are very expensive). A three-way catalytic converter: Note the two separate catalysts. There are two main types of structures used in catalytic converters -- honeycomb and ceramic beads. Most cars today use a honeycomb structure. Ceramic honeycomb catalyst structure The Reduction Catalyst The reduction catalyst is the first stage of the catalytic converter. It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxygen in the form of O2. The nitrogen atoms bond with other nitrogen atoms that are also stuck to the catalyst, forming N2. For example: 2NO => N2 + O2 or 2NO2 => N2 + 2O2 The Oxidization Catalyst The oxidation catalyst is the second stage of the catalytic converter. It reduces the unburned hydrocarbons and carbon monoxide by burning (oxidizing) them over a platinum and palladium catalyst. This catalyst aids the reaction of the CO and hydrocarbons with the remaining oxygen in the exhaust gas. For example: 2CO + O2 => 2CO2 But where did this oxygen come from? The Control System The third stage is a control system that monitors the exhaust stream, and uses this information to control the fuel injection system. There is an oxygen sensor mounted upstream of the catalytic converter, meaning it is closer to the engine than the converter is. This sensor tells the engine computer how much oxygen is in the exhaust. The engine computer can increase or decrease the amount of oxygen in the exhaust by adjusting the air-to-fuel ratio. This control scheme allows the engine computer to make sure that the engine is running at close to the stoichiometric point, and also to make sure that there is enough oxygen in the exhaust to allow the oxidization catalyst to burn the unburned hydrocarbons and CO. more info click here handsdown and tell your mother to buy a highlighter incase you needs to take notes.... http://auto.howstuffworks.com/catalytic-converter.htm |
01-19-2006, 10:45 AM | #9 |
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oh and the cancer well i hope your kids have cancer in general and i will laugh and piss thier grave.
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01-19-2006, 11:49 AM | #10 |
Street Racing Instructor
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Guys, you need to be civil in this forum. Simmer down! FriedIceCream, you did start it with your comment about 'captain planet'. That was not necessary unless you truly believe removing a cat converter for a 1hp gain or so is worth potentially damaging the environment.
While we are on the topic, what other modifications were made to the car Subiesport dynod the cat on? Was the cat the only thing changed, cat/exhaust, cat/header/exhaust or something more? |
01-19-2006, 12:29 PM | #11 |
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yes other mods were there but they dynoed(sp?) individually after each product they added...headers went on first not to much gain at all...then came the hi-flow cat and exhaust that made it go to about 10-13 HP gain i cant remember it all, dont have the magazine in front of me.
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01-19-2006, 12:59 PM | #12 |
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i'll be more civil, but it's not like you have to be a tree-hugging hippie in order to understand that hydrocarbons and carbon monoxide are not good things to be spewing all over the roadways in pursuit of 1-2 hp. i apologize for bringing your future kids into it, but the emission controls are there for a reason, and it's not to appease a bunch of hippies.
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01-19-2006, 01:27 PM | #13 |
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as funny as it may sound, causing some sort of backpressure in naturally aspirated engines helps to keep performance. whereas in forced induction engines it's something that should be avoided as much as possible, to put simple.
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01-19-2006, 01:30 PM | #14 |
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Don't mind friedicecream. He always acts like that. There's always a handful of nasty little trolls around here that want nothing more than to make waves. Jamie usually takes care of them in due time...
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01-19-2006, 01:40 PM | #15 |
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Friedicecream doe snot represent the views of TXIC either...
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01-19-2006, 01:54 PM | #16 |
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wow you all gather all that up by me saying captain planet? wow sensative people are around here. jeesh. Can you change my title under my username to nasty little troll. LOL
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01-19-2006, 02:47 PM | #17 |
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I said, ALWAYS acts like that. ie, not the first time I have seen such drivel...
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01-19-2006, 08:20 PM | #18 |
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Its not backpressure you want, thats a myth, you want exhaust velocity.
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01-19-2006, 09:39 PM | #19 |
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This is very bad and irresponsible no one should ever modify their car to pollute more than it does from the factory. It is also very dangerous to make your car faster. why would you want to go fast that's scary.
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01-20-2006, 04:51 AM | #20 | |
Visiting NASIOC Timeout
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I think he was asking for your interoperation .. not encyclopedia britannica but that was pretty funny.. sorry its 3 am anyhow.. cats and pollution... yeeehaw ! and its not worth it for a few horses.. you should come out to Phoenix or LA... you'll see what I mean.. sunny days arent sunny because of that ! |
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01-20-2006, 04:55 AM | #21 | |
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01-20-2006, 06:11 AM | #22 |
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Nice to see the turbo trolls coming out.
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01-20-2006, 07:45 AM | #23 | |
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01-20-2006, 07:47 AM | #24 | |
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01-20-2006, 08:44 AM | #25 | |
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that still doesn't mean i want to be inhaling carbon monoxide because you did a ricer flyby and got caught ahead of me at the next red light. going catless on a EJ25 is like lubing up a keyboard with astroglide. it's not a racing engine and it's going to do more harm than good. if you're running leaded race gas, with a good reason to do so... then you have a reason to not run cats and should also not operate that vehicle on the street. if you can afford a track car where it doesn't have to meet emissions you can afford a daily driver that does meet emissions. there's little to no performance gain on a stock car, and there's no justifiable reason to go catless. you're not special, you're not better than anyone else in emission law's eyes. your mommy might say you are, but you have to run a cat just like everyone else, and nothing you say is going to negate that. |
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