catalytic converter delete?

deekster_caddy wrote:

I would recommend you get an O2 Simulator from ZZP or Intense for your rear O2, if you don't have a way to program out the code.

i dont believe they sell them anymore. i thought there were legal problems with sims so they took them off the market. if you are lucky you might snag one on clubgp sale section.

I'm having some trouble removing my cat from the fuel rail:

Spoiler:

i think he was refering to the cat in his exhaust line, not the fuel

Spoiler:

funny!

Karma wrote:

I'm having some trouble removing my cat from the fuel rail:

Spoiler:

Nicely done, lol.

SCbuick010 wrote:

cat delete

why

7901mark wrote:

SCbuick010 wrote:

cat delete

why

Umm, you gain around 5hp and save around 10-15lbs of weight... that seems like a good enuff reason.

Also, there's almost no increase in exhaust level output when deleting the cat converter - if you leave the cat back system (resonator) intact.

and..i had my annual smog yesterday,and the riv passed without the cat .
how bout them apples?

robotennis61 wrote:

and..i had my annual smog yesterday,and the riv passed without the cat .
how bout them apples?

Well whadaya' expect in a state where there are no clocks, and gambling & hookers are legal?

What did they do? OBD II test, tail-pipe test, or tail-pipe-on-dyno test?

Eldo wrote:

robotennis61 wrote:

and..i had my annual smog yesterday,and the riv passed without the cat .
how bout them apples?

Well whadaya' expect in a state where there are no clocks, and gambling & hookers are legal?

What did they do? OBD II test, tail-pipe test, or tail-pipe-on-dyno test?

ha ha! don't know? they did the tail pipe thing,looked under the hood,and passed me. i was chuffed! gave the attendant a fat tip and booked!

So they put the sniffers in the tailpipes, checked it at idle, maybe again at 2500RPM, and it was clean enough to pass?

yap! dont worry,i was surprised too....

etosino2009 wrote:

i recently took off my cat too and drove and put pipes in place with and it sonded really nice without it but appearntly when i WOT one of the pipes i clamped down blew off which you can definitley tell and hear when that happens. which i decided to have it welded by a shop but heres the problem no shop will be able to work on a car without the cat on due to the laws. so as i was thinking i could get a pipe welded in place of a cat (this is a small locally owned muffler shop) who would do it but would if something happend to the engine and i needed to get it worked on or my brakes which i proablly wouldnt be able to fix then im screwed. but if you know how to work on your engine go for it, it does sound really nice with it off which i really miss.

There’s a thing you can do called hollowing out the cat, it’s a delicate procedure let me tell you.
uh hum a friend of mine wink wink took cut off the cat then took a piece of roll bar and hammered it through the core a couple times till it came out, then used a air hose to spray out the excess. Then I err I mean my friend welded it back on and to the untrained eye it looked like I had replaced my cat.

Cmurphy wrote:

etosino2009 wrote:

i recently took off my cat too and drove and put pipes in place with and it sonded really nice without it but appearntly when i WOT one of the pipes i clamped down blew off which you can definitley tell and hear when that happens. which i decided to have it welded by a shop but heres the problem no shop will be able to work on a car without the cat on due to the laws. so as i was thinking i could get a pipe welded in place of a cat (this is a small locally owned muffler shop) who would do it but would if something happend to the engine and i needed to get it worked on or my brakes which i proablly wouldnt be able to fix then im screwed. but if you know how to work on your engine go for it, it does sound really nice with it off which i really miss.

There’s a thing you can do called hollowing out the cat, it’s a delicate procedure let me tell you.
uh hum a friend of mine wink wink took cut off the cat then took a piece of roll bar and hammered it through the core a couple times till it came out, then used a air hose to spray out the excess. Then I err I mean my friend welded it back on and to the untrained eye it looked like I had replaced my cat.

Also there is this procedure where you just cut behind the cat, take an air hammer with a big long bit, and go to town. Startup the car and rev it to blow the crap out, then reconnect. Just thought I would throw that out for a redneck cure.

Karma wrote:

Cmurphy wrote:

etosino2009 wrote:

i recently took off my cat too and drove and put pipes in place with and it sonded really nice without it but appearntly when i WOT one of the pipes i clamped down blew off which you can definitley tell and hear when that happens. which i decided to have it welded by a shop but heres the problem no shop will be able to work on a car without the cat on due to the laws. so as i was thinking i could get a pipe welded in place of a cat (this is a small locally owned muffler shop) who would do it but would if something happend to the engine and i needed to get it worked on or my brakes which i proablly wouldnt be able to fix then im screwed. but if you know how to work on your engine go for it, it does sound really nice with it off which i really miss.

There’s a thing you can do called hollowing out the cat, it’s a delicate procedure let me tell you.
uh hum a friend of mine wink wink took cut off the cat then took a piece of roll bar and hammered it through the core a couple times till it came out, then used a air hose to spray out the excess. Then I err I mean my friend welded it back on and to the untrained eye it looked like I had replaced my cat.

Also there is this procedure where you just cut behind the cat, take an air hammer with a big long bit, and go to town. Startup the car and rev it to blow the crap out, then reconnect. Just thought I would throw that out for a redneck cure.

i like that one, might have to try it some time

for a visual inspection,just remove the cat shield,delete the guts,and weld the 2 pieces of shield back onto the pipe. no ones the wiser.....

Hometown Hero wrote:

7901mark wrote:

SCbuick010 wrote:

cat delete

why

Umm, you gain around 5hp and save around 10-15lbs of weight... that seems like a good enuff reason.

Really? 5hp for introducing those awful gases into the environment?? Awesome, thats really smart.

well i do my part for the environment anyway..i make sure i consume at least 3 cows per year....

Quote :

Really? 5hp for introducing those awful gases into the environment?? Awesome, thats really smart.

To be fair, catalytic converters are not foolproof filters that magically contain 'awful gases'. What they do is convert the awful gasses into different awful gases. So while a cat converter makes less SMOG-producing hydrocarbons, it makes a whole lot more CO2 than a non-converter set-up. If Al Gore is right, CO2 emissions are one of the most pressing concern's for our planet's long-term health. You choose: use a cat converter and help your city to have cleaner air, or don't use a cat converter and help to prolong the lifespan of planet Earth. It's an interesting choice.

Another disturbing fact is the stoichiometric A/F ratio of 14.7:1 required to use catalytic converters in any exhaust system. It has been proven that engines can be designed to run A/F ratios as lean as 20:1 or even leaner (using 35% less fuel), but they couldn't use catalytic converters, which require the richer 14.7:1 ratio. It is my belief that back in the early '70s, when auto makers had to make the decision between designing all-new 'lean-burn' engines, or just slap a small device on the exhaust pipes of the existing line, they chose the simplest and most cost-effective solution. They did not willingly put cat converters on cars & trucks to be more enviro friendly, imo.

Finally, cat converters do create a significant amount of pollution. Their use of precious metals, most of the material mined from the small Siberian city of Norilsk, has interestingly turned the area into one of the most polluted cities in the world, as a direct result of its smelting operations for heavy metals such as platinum for catalytic converters. According to TIME Magazine, Norilsk is listed in the top-10 worst pollution sites in the world, ranked even above Chernobyl. It creates 1% of the entire world's sulpher dioxide emission. There is so much heavy metal in the ground, platinum ore for catalytic converters can be mined by sifting the soil; there is so much metal in the air, there is not a single living tree within 30 miles.

How much of the world's platinum is used strictly for catalytic converters? 54% - by far the largest portion, followed by jewelry with 20% and electronics with 6%.

AA wrote:

Quote :

Really? 5hp for introducing those awful gases into the environment?? Awesome, thats really smart.

To be fair, catalytic converters are not foolproof filters that magically contain 'awful gases'. What they do is convert the awful gasses into different awful gases. So while a cat converter makes less SMOG-producing hydrocarbons, it makes a whole lot more CO2 than a non-converter set-up. If Al Gore is right, CO2 emissions are one of the most pressing concern's for our planet's long-term health. You choose: use a cat converter and help your city to have cleaner air, or don't use a cat converter and help to prolong the lifespan of planet Earth. It's an interesting choice.

Another disturbing fact is the stoichiometric A/F ratio of 14.7:1 required to use catalytic converters in any exhaust system. It has been proven that engines can be designed to run A/F ratios as lean as 20:1 or even leaner (using 35% less fuel), but they couldn't use catalytic converters, which require the richer 14.7:1 ratio. It is my belief that back in the early '70s, when auto makers had to make the decision between designing all-new 'lean-burn' engines, or just slap a small device on the exhaust pipes of the existing line, they chose the simplest and most cost-effective solution. They did not willingly put cat converters on cars & trucks to be more enviro friendly, imo.

Finally, cat converters do create a significant amount of pollution. Their use of precious metals, most of the material mined from the small Siberian city of Norilsk, has interestingly turned the area into one of the most polluted cities in the world, as a direct result of its smelting operations for heavy metals such as platinum for catalytic converters. According to TIME Magazine, Norilsk is listed in the top-10 worst pollution sites in the world, ranked even above Chernobyl. It creates 1% of the entire world's sulpher dioxide emission. There is so much heavy metal in the ground, platinum ore for catalytic converters can be mined by sifting the soil; there is so much metal in the air, there is not a single living tree within 30 miles.

How much of the world's platinum is used strictly for catalytic converters? 54% - by far the largest portion, followed by jewelry with 20% and electronics with 6%.

Thanks AA, I'm very well aware of what a cat does.....and there is a reason its illegal to remove it. Great info, but your preaching to the wrong person. Its not worth the minuscule amount of power you gain to introduce those pollutants into the air.....but I didnt learn this until I was an adult. I pulled off my share of cats as a kid, just have learned from my mistakes....

To each there own, not worth it in my eyes

7901mark wrote:

....Great info, but your preaching to the wrong person. Its not worth the minuscule amount of power you gain to introduce those pollutants into the air.....but I didn't learn this until I was an adult. I pulled off my share of cats as a kid, just have learned from my mistakes....

To each there own, not worth it in my eyes

Actually, I think AA was pointing out that there are other reasons the cat isn't as sacrosanct as it once was... not to mention that, like the "lean-burn" engines that didn't have enough computer power to work well back in the 70's & 80's, we've now controlled fuel & ignition so well now that Robo can pass the tailpipe test without it. Remember, even our 10+ year-old-cars have more computer power on board than Apollo...

In general, though, I'm with you. Modern cats flow well enough that it isn't worth removing them for HP. Also in the plus-column: Take a look at a current TV show or movie set in L.A.... Now watch an episode of something like Columbo... In the 70's you sometimes couldn't see the bottom of the hill from the top! And unfortunately, there sure as hell isn't fewer people in that basin than there was 30 years ago!

-courtesy of the catalytic converter....

good points all. dont forget the acid droppings that are created through the process and pass out the tail pipe and back into the ground. clean the air,destroy the earth. thank you catallmighty!

robotennis61 wrote:

good points all. dont forget the acid droppings that are created through the process and pass out the tail pipe and back into the ground. clean the air,destroy the earth. thank you catallmighty!

and you would prefer acid rain instead?

Ummm.... If you eliminate the cat, what will all the meth-heads steal?