I am considering removing my Catalytic Converters.
But I have a few questions for you experienced modders:

- How much of a HP increase can I expect with stock exhaust?
- How much louder will my exhaust be with stock exhaust?
- Where do the O2 simulators mount?
- Do the O2 simulators give any error codes?
- Would I be violating any laws if I do this in a daily driver (I am in Florida)?

Thanks for your help.
:steering:

 

1)You will gain some HP but don't expect a lot. Added benefit is a reduction or elimination of detonation if it's "cat" related. They hold in a lot of heat and have been known to cause detonation in some cars.
2)You will be some louder, but not a lot if you have the stock exhaust.
3)They mount in the catback and can be changed fairly simple or you could have the codes deleted and not mess with them, thats what I did.
4)They will not give any codes unless they are defective.
5)It is illegal to remove them, but a LOT of people do. I don't think a cop is going to look up under your car and we don't have inspections down here in Fl.





[Modified by LS1JAY, 4:04 PM 12/4/2003]

 

where do you get this stuff from?

 

cats don't work to bad, just add any cat back system, and air intake. what hurts is sitting in line at bank or wherever with car idling this causes the cats to heat up. starters are cheeper just turn it off, or go inside. your car will last alot longer. :thumbs:

 

Man Sandra!!! :) I can hardley agree that all of our laws make sense.....ciggarettes are legal and kill 500,000 a year....pot is illegal & kills.....zip, nada, (and this from government statistics!) So that is a deep debate.

The rear O2's (sensor 2) is easily written out by LS1 edit or a O@ sim (you need the front ones) and although the gains are minimal, they are real if tuned right.

There are great performance cats (Random tech for example) that keep you legal & give similar gains (not quite as good but close enough) so if you are the "I follow every one of the 20 million laws on the books" person (no J-walking or spitting on a sidewalk in certain towns) than don't do it.

If you are a "The government is to dang involved in every aspect of my life" person go for it.

If it was a true crime aginst humanitu then how could I pass several emmission sniffer & inspection tests before we did away with them here in FL with no cats????? (near perfect tuning on a non-oil burner always passed in the past).

I respect anyones decision to stay 100% legal, but I also am amazed with the "Holier than thous" that condem others for such minor infractions (by minor I don't mean the commiting of a Intrinsic crime where there is a defined victim involved, theft, murder, destruction of property, assault, etc.)

The sound is awesome w/out cats! :cheers:

 

"detonation occurs in the combustion chamber, not 5' back in the exhaust."

Answer: Thanks for pointing that out! I KNOW THAT! My point was that the heat caused by the cats can cause detonatin when they are close to the block! I DO know what I'm talking about.


"the o2 sensors mount in the intermediate pipe both ahead of and behind the cats, the cat backs are mufflers at the very back of the car."
Answer: Yes, but you put the O2 sims in the back! Cat backs are NOT "mufflers at the very back of the car" catback means from the cats back!

"how will the pcm control a/f ratio with no o2 sensors?"

Answer: With 02 sims or LS1 edit where you can delete the codes!

"so as long as some people commit crimes, it's ok? how much is a lot of people?"

Answer: Are we talking about criminals or cars? Technically it is legal to run no cats as long as it's an off road car!


"what do you have against clean air? the car produces plenty of power at 50 state legal trim."

Answer: Maybe for you, but not for a lot of us!


how do you know that florida cops don't read this forum?

Answer: I don't care if they do! Actually, I know several "cops" who run NO cats on their LS1 cars!


I get this stuff from experience and knowledge! I have been drag racing GM cars for over 17 years! L-98's, LT1's and LS1's!

So Sandra, where do you get your ideas from?




[Modified by LS1JAY, 7:00 PM 12/4/2003]

 

Wow Sandra. 100 posts on this forum. Looking at your post history, you really enjoy injecting your biased, and often incorrect, opinion on just about everything.

Looks like you enjoy hijacking threads too.

Enjoy the board, but try lightening up a few notches. There are a lot of folks here that really know what they are talking about.

:cheers:

F

 

I agree, Sandra this is no way to start life on this forum. People are friendly here, and if you aren't sure about something you are better off NOT throwing someone else under the bus. I don't know where you get your comments from but I don't think you have ever put in O2 sims yourself from what I read. :D


[Modified by BADBLACK99, 9:16 PM 12/4/2003]

 

Why? Very little to gain... :rolleyes: :skep: :bb :crazy:

 

without cats ,your exhaust will reek and be especially noticeable if your windows are open.

 

TLEWIS4095

As someone said better than me "I DON'T NEED THAT MUCH ORGANIZATION IN MY LIFE"

Right on!

 

Please explain what you mean here. I am old enough to have cars prior to emission controls and I don't remember the exhaust "reeking".

sniff, "I love the smell of gasoline in the morning. It smells like victory!"
:D

 

No motorcycle that I am aware of has catalytic converters, my zx was made before catalytic converters (first 6 months of production) my bronco has no catalytic converter, no outboard motor (4 stroke or 2) has a catalytic converter. A modern, tuned engine does not need one. ZERO "reek" or whatever they were talking about.

 

1. 5-10 hp maximum, if you have the car dyno-tuned after removal. Net loss of power possible without tuning.

2. Not a lot louder with OEM exhaust.

3. Replaces the rear (secondary) sensors, aka compliance sensors.

4. Possible.

5. Absolutely, completely and totally illegal in the entire United States of America.

 

Hey Sandra, with your mods, are you telling me that you could roll your car to any state and pass emissions...I doubt it!! With as much fuel as you need for your V2 and the x pipe and catback, you would probably not pass either! :lol: :chill:

 

I changed the exhaust on my Tbird SC last summer and ditched the cats,and the exhaust stinks to the point that when I pull the car out next spring ,Im getting high flow converters put on.Ive had other cars years ago w/o cats that I dont recall stinking as much.I wont be pulling the cats off of anything else that I own!

 

You delete the rears (edit tune) and the front ones (there are four 02's), will maintain the a/f ratio.

 

correct. The front pair are the only ones that are involved with AF ratio settings. The rears are just to check if the cats are working properely.

 

Rmoving the cats and leaving the stock exaust is a bit of a retarded idea. If you are going to go to all the effort at least put some exaust cutouts or cat back or something, If you are using stock exaust I doubt you would get noticible power, but if you must take them off, any difference in the noise will be totally unoticable because you will have your windows up from the smell, if you don't believe some of the people here try it your car will smell like %$#&! Just my .02 cents :crazy:

 

On stock cars, there are a few horses in them, especially if you have the '01 later pup cats.

On two LS1 dyno TUNED cars ('02 Z06 with BW and FLP exhaust, and '01 with BW, FLP, H&C-both tuned to the cats, and than w/o cats) two "high flow" cats cost 10/11 and 6/10 RWHP/TQ vs. the straight pipes.

If these cars were't tuned for the baseline with, than without-I believe you would have seen only half the gains (and both cars are making 445+ and 500+ at the flywheel-so moving a lot of exhaust).

But the fumes are sickening on the 500+ car, the 445 (stock cam) is not so bad.

Metal Matrix are very expensive, but the ultimate way to go-which is where the guys are going. May not pass the visuals in some states, despite it being sniffer friendly...Florida "doesn't" care, but it is illegal.


[Modified by MiamiDave, 7:08 AM 12/6/2003]