 Takeing out the Catalatic converter, What kind of gains? |
 Sep 13, 2004 - 8:19 PM
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Just like the topic says, or is this a BADDDD Idea?
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Sep 13, 2004 - 8:24 PM
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Enthusiast  Joined Aug 30, '02 From San Juan, PR Currently Offline Reputation: 4 (100%) |
It's not going to be a very noticeable difference. You'll feel it but it's not like :"Damn, this thing got quick". But hey, better than nothing.
-------------------- Past - 7A-FTE: Will never forget you
Present - 3rd Gen 3S-GTE: Swap in progress QUOTE (SinisterSinner @ Dec 19, 2009 - 10:52 AM)  I dont want to even think of turbos, they blow up way too often... |
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Sep 13, 2004 - 8:25 PM
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Bad idea though?
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Sep 13, 2004 - 8:26 PM
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 Enthusiast Joined Aug 30, '02 From Anaheim, CA Currently Offline Reputation: 0 (0%) |
dont waste the time and money unless you are turbo charged -------------------- 1994 Celica GT4 WRC Edition
@gt4.wrc on Instagram |
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Sep 13, 2004 - 8:33 PM
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 Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
ohh man that was the best cheapest mod that i have ever done you can really see it from like 3500 to about 5800 i couldn't believe it when i went for a test drive definately worth doing. i broke 2 extenisons removing it and no they weren't the lil 2 dollar ones they were craftsman
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Sep 13, 2004 - 8:34 PM
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Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
and it doens't smell like rotten eggs becuase of the seconadary cat. that's the one that is not worth the bother of taking out.
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Sep 13, 2004 - 8:39 PM
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 Enthusiast Joined Dec 2, '02 From Portland, Oregon Currently Offline Reputation: 0 (0%) |
your cat was probably melted and clogged... If you have a good working cat it won't make much of a difference.
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Sep 13, 2004 - 8:41 PM
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Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
actually it wasn't at all i was quite surprised.
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Sep 13, 2004 - 8:59 PM
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 Enthusiast Joined Oct 30, '03 From IL Currently Offline Reputation: 15 (100%) |
would this pass the emission test?
-------------------- PROJECT 6TH GEN
 <FS: Things up for grabs> <Progress> |
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Sep 13, 2004 - 9:23 PM
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 Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
It's not legal in any State to run a car (post 1974) without a CAT... and it most definately won't pass smog without a cat. Anyways... gains from removing the catalytic converters is not worth the hassle. The gains are minimal... -------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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Sep 13, 2004 - 9:40 PM
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 Enthusiast Joined Feb 27, '04 From Illinois Currently Offline Reputation: 1 (100%) |
But wouldn't that help your gas mileage a little bit? My buddy claims that since taking his out, he's picked up like 5 miles per gallon..
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Sep 13, 2004 - 9:46 PM
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Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
in his head maybe... the butt-meter is not a good way to tell anything. I'm running no-cat on my AE86 Hatch and it's not noticeable compared to my AE86 Coupe. The hatch pulled on the coupe with a cat by 1 and 1/2 cars, and again the same thing without a cat... only a bit louder. The exhaust flow does slightly increase, but it's not enough to make any noticeable difference. -------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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Sep 13, 2004 - 10:35 PM
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Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
here in minnesota they took away the emission testing so haha but it's still illegal to not to have on but if they wanna argue no cops is goona know where the primary cat is. if he gives ya some hassle tell em to look under the car and there he'll find the secondary cat i like to call it the kitten haha.
This post has been edited by rjbibeau: Sep 13, 2004 - 11:16 PM -------------------- |
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Sep 14, 2004 - 4:54 AM
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 Enthusiast Joined Oct 29, '03 From Gosport, Hampshire, UK Currently Offline Reputation: 0 (0%) |
A lot of the us UK guys are finding a de-cat pipe a really good and noticeable modification to have.
I personally, would say to go for it... just put the Catalyser back on for the emissions test when it comes to the time. -------------------- |
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Sep 14, 2004 - 7:10 AM
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Well...even if you know someone that will pass you. Im sure we're good!?
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Sep 14, 2004 - 11:11 AM
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 Enthusiast Joined Nov 27, '03 Currently Offline Reputation: 0 (0%) |
I was told by a guy who owns an emissions and safety testing place here in Utah, that if you are caught not having a cat on your car you could get up to a 25,000 dollar fine....sounds a bit extreme but if it were me I would just go with a high flow cat and save yourself the trouble. Like kwanza said unless your cat is currently clogged you won't notice much of a difference. The only way that you would is if you did an entire exhaust and not just 3 feet of it.
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Sep 14, 2004 - 11:25 AM
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Well thats what im doing they are running a whole bunch of stuff from the engine to the back! he said its going to be bad ass
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Sep 14, 2004 - 12:40 PM
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 Enthusiast Joined Feb 10, '03 From Connecticut Currently Offline Reputation: 11 (100%) |
what about boosted? -------------------- |
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Sep 14, 2004 - 12:53 PM
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 Enthusiast Joined Jul 5, '03 From Scotland , Uk Currently Offline Reputation: 0 (0%) |
Made a huge diference to my car , the low down torque it gave made the car so much better driving around town, as raz sayed over here in the Uk everyone who has removed theres noticed a marked improvment, mind u the 3s-ge doesnt have a lot of low down torgue so any improvement will be felt better that with the engines u guys have
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Sep 14, 2004 - 2:06 PM
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Enthusiast Joined Aug 30, '02 From Anaheim, CA Currently Offline Reputation: 0 (0%) |
lol first i put the catback on my car, no power gains that i could feel then i put the down pipe and test pipe, which got rid of the 2 cats after the turbo. the car ran better, hit boost a little sooner, and made more top end power then i got rid of the damn cat that subaru put BEFORE the turbo that made a HUGE difference. boost came sooner, hit harder and 3rd gear wasnt a girlie gear anymore. best exhaust on a boosted car is no exhaust, after the turbo that is. -------------------- 1994 Celica GT4 WRC Edition
@gt4.wrc on Instagram |
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Sep 14, 2004 - 2:19 PM
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 Enthusiast Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%) |
But taking out the cat would actually lose you low end torque. Your doing nothing to increase gas scavenging, just increasing exhaust flow. So, all in all, you should have lost low end torque. |
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Sep 14, 2004 - 2:25 PM
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Enthusiast Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%) |
Didn't everyone tell u that?
and I KNOW we told u that one
Sometimes taking the resonator out makes the car sound horrible, I know many people on here say that was a mistake. It sounds like he's going to gut your cat (your cat will now just be for looks; you won't pass emissions) Make sure he's not runnign too big of piping |
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Sep 14, 2004 - 2:30 PM
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He's not, i allready asked him!
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Sep 14, 2004 - 2:32 PM
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Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
On a boosted car is a different story because the exhaust velocity is much much higher than on an n/a and freeing up the exhaust can make some big gains. As for legal issues... you can carb certify and legalize a custom turbo kit, but paperwork and $$$ will thwart most attempts. As for the smog issue, if the cat is good, and the car burns relatively good, then I would imagine the car can still pass smog even with a turbo kit... or swap (tail pipe emmissions at least). -------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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Sep 14, 2004 - 2:35 PM
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Enthusiast Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%) |
In fact, freeing up the exhaust can lead to almost your biggest gains (besides uping the boost) since your turbo only spools up as fast as your exhaust lets it. If your exhaust is constrained, the exhaust gasses will go slower, and so will your turbo. In the short run, this is good for spooling up your turbo the fastest, but in the long run, you'll reach a point where your turbo just can't turn fast enough because of the exhaust gases |
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Sep 14, 2004 - 3:27 PM
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 Enthusiast Joined Sep 28, '03 From Bloomington, IN Currently Offline Reputation: 0 (0%) |
I took my resinator out and regret it. Untill my car is plently warm, I sound like King Ricer. And there are plently of topics about this, use the search.
As far as gains go, lil low end torque will go, a bit up up hi will flow better. You pick ur pick if u want ur power up hi or down low. (I went up hi, we lack in hi rpms, but hold up well down low) -------------------- NASA/SCCA RX-7....currently under the knife
92 Civic hatch B16 - Sold 10th anniv RX-7 - RIP The Slow Celica - Sold...and then crushed crushed due to street racing. Quote from Seinfeild: George's Boss reading a magazine: "People magazine's most beautiful people. Oh and a Celica...nothin wrong with that!" |
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Sep 14, 2004 - 7:18 PM
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Enthusiast Joined Jul 5, '03 From Scotland , Uk Currently Offline Reputation: 0 (0%) |
Look m8 I only spend the time to write these posts if I know what I am talking about I am not in the habit of coming on here and telling lies. It DID increase low end torque, what’s the point in me taking the time to say it helped my car when it didn’t?? it would make me a very bad member to promote something that doesn’t make any difference and have fellow members go out and buy a decat to find its a waste off money. I am an avid Celica fan that like's to give good honest advice not some bumped up crap just to make myself look good, go ask the same question on www.celica-club.co.uk and see what the answers will be , I bet they all tell the same story as me .. I am only trying to help but every time I say something on this site I get flamed canny win..... -------------------- |
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Sep 14, 2004 - 7:31 PM
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Enthusiast Joined Nov 27, '03 Currently Offline Reputation: 0 (0%) |
Its just the way shid is.....he likes to argue for no reason.
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Sep 14, 2004 - 9:42 PM
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Enthusiast Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%) |
... Yeah, right. Look, taking out the cat increasing exhaust flow while having the negative effect of decreasing gas scavenging pressure- which is directly related to low end torque. I don't give a **** what you think, thats general physics. Back it up with a dyno sheet. |
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Sep 14, 2004 - 10:25 PM
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 Enthusiast Joined Mar 27, '04 Currently Offline Reputation: 14 (100%) |
so taking out the resonator makes it sound bad? will it pass inspection?
-------------------- ~Daniel~ No Longer Celica Owner.. moved on to a 03 WRX-EJ207
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Sep 14, 2004 - 10:54 PM
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Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
i took out the resonator out all that it does it muffles the backfire a bit when shifting. otherwise it sounds awesome without it it almost doubled it.
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Sep 14, 2004 - 10:56 PM
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Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
just gut the primary cat out don't let these dudes tell you that it's worthless because it takes like a whole 15 minutes wow big deal hey why not do it?
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Sep 15, 2004 - 1:29 AM
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Enthusiast Joined Aug 30, '02 From Anaheim, CA Currently Offline Reputation: 0 (0%) |
if its one of those cats that is built into the exhuast manifold, removing it will help the entire powerband. if its the one that is located just behind the firewall, then you wont notice any gains, possibly some loss in the low end. i'm speaking from experience, on my dad's 98 civic DX coupe, it had the kind of exhaust manifold with built in cat. one of the runners cracked, so we took it off and replaced it with a 4-2-1 header i bought off of ebay. car got louder, and pulled harder through all the rpms also, went from 32mpg to 34mpg(he drove 80 miles a day round trip to work) since i took my cats out of my wrx, i have noticed slightly better mpg. not that i am technically getting more per tank, its just that i push the car a little harder and still get the same milage. i gotta drive a good 150 miles tomorrow, i usually got 27-28mpg on the freeway, i'll see what i get tomorrow. -------------------- 1994 Celica GT4 WRC Edition
@gt4.wrc on Instagram |
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Sep 15, 2004 - 1:56 AM
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Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
That's completely different though... Removing the pre-cat in the header is not "removing the cat" like say under the car, which this topic reffers to. Even if you remove the cat from the exhaust manifold, the manifold still will not make gains because of the size of the space where the cat used to be. Exhaust manifolds in n/a trim are pretty picky about flow and velocity when it comes to actually making some power. That's why a header is needed... and of course, a header will make some positive gains in most cars. As for your WRX... its mix in this discussion is not accurate mostly because being Turbo charged... it will see gains from exhaust flow modifications while n/a motors usually do not always see gains... -------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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Sep 15, 2004 - 2:47 AM
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 Enthusiast Joined Jul 12, '03 From Chatham, Ont Currently Offline Reputation: 0 (0%) |
Removing the cat is environmentally irresponsible...
at least thats just me view on itAnd you people really need a lesson in the power of suggestion, if you do something you think is going to make your car faster, then you'll probably believe it does regardless of whether it made a difference or not. So while you take out thge cat, put some 3" pipes on your stock engine, and cut some holes in a few vaccum hoses, should take away plenty of horse power, but I swear it'll feel like you added 50hp!!!!!! 
This post has been edited by Uppitycracker: Sep 15, 2004 - 2:54 AM |
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Sep 15, 2004 - 8:58 AM
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hahahaha, well im pretty sure im not going to lose anything, the guy dyno'd it before, and he is going to dyno it after just to make sure nothing was lost!
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Sep 15, 2004 - 10:54 AM
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Enthusiast Joined Aug 30, '02 From Anaheim, CA Currently Offline Reputation: 0 (0%) |
i get what youre saying, had i gutted the cat in the manifold, the car wouldnt have had a noticable change but i am pretty sure that was the only cat on my dad's car, in fact, it was, and the dealer wanted like $900 for it. -------------------- 1994 Celica GT4 WRC Edition
@gt4.wrc on Instagram |
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Sep 15, 2004 - 11:08 AM
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Enthusiast Joined Sep 6, '04 From oakdale Mn Currently Offline Reputation: 0 (0%) |
when we refer to cat we're of course talking about the primary cat
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Sep 16, 2004 - 6:47 PM
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Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
Yea... I believe the older D15/16 Civics have only one cat in the manifold... -------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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Sep 16, 2004 - 9:04 PM
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 Enthusiast Joined May 18, '04 From Charlotte, NC Currently Offline Reputation: 0 (0%) |
what about high flow cats, they do anything?
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Sep 17, 2004 - 12:22 AM
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Enthusiast Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%) |
I'm not sure on this, so I'm gonna turn on ass talking mode. I believe they'll increase the flow capacity of your cat; enlarge the piping, etc; while keeping it's carb legality and keeping the environment semi safe |
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Sep 18, 2004 - 7:38 PM
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Enthusiast Joined Oct 29, '03 From Gosport, Hampshire, UK Currently Offline Reputation: 0 (0%) |
My 2 pence....
The De-Cat pipe, in my opinion, is definetley worth getting as it improves the low-end torque on the 3SGE engines.... that's what i've gathered after putting the de-cat pipe in, putting the catalyser back on and then re-fitting the de-cat pipe. A fully-straight-through exhaust system will lose a LOT of top end acceleration!! tried this and my top-speed got capped down to around 90mph before the engine wouldn't go any further... it would go faster if i went down hill... but on level road... forget it :S I assume this was mainly down to the lack of back-pressure thus causing the gases to shoot straight out. -------------------- |
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Sep 18, 2004 - 8:31 PM
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Enthusiast Joined Jul 5, '03 From Scotland , Uk Currently Offline Reputation: 0 (0%) |
im going to get my car on the rolling road very soon so should have some figures ,
it wont be before and after figures but standard the 3s-ge is 173 bhp, taking into account the cars 10 years old wth 96,000 miles on the clock i recon standard with that mileage would be around 160/165bhp, iv only got a de cat and k&n 57i induction kit on the car so what ever i get should be good reading (i hope lol) Raz was 90 mph the top speed u could reach?? if so i recon there was something else at play to cause such a drematic reduction in top speed as our cars are rated at 139mph top speed , were u towing a large caravan at the time lol 
This post has been edited by kevstir: Sep 18, 2004 - 8:34 PM -------------------- |
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Sep 19, 2004 - 1:45 AM
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Enthusiast Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%) |
Back pressure being good is a myth, it's ALWAYS bad; it's gas scavenging pressure (which is often a result of, but can be not related to back pressure if exhaust is done prop.) that many people confuse this for |
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Sep 19, 2004 - 9:18 AM
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Enthusiast Joined Oct 29, '03 From Gosport, Hampshire, UK Currently Offline Reputation: 0 (0%) |
Pretty much.... it just wouldn't get any decent acceleration past 90 at all  The bore of the exhaust system had been increased though.
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