 Takeing out the Catalatic converter, What kind of gains? |
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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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