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AA
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PostSubject: Re: catalytic converter delete?   Sat Aug 16, 2008 9:14 pm

I think so, but I think you'd notice a drop in power first. Anything clogging the exhaust will increase your boost PSI, causing heat and making knock.

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PostSubject: Re: catalytic converter delete?   Mon Aug 18, 2008 10:37 am

i knocked the insides loose in mine. it was glowing red from being clogged up. the car moves much better now. its like night and day. i also cleaned my MAF sensor and changed out the
IAC sensor as well. runs like night and day, and it has a little more of a growl to it too. like im hiding something under the hood, which im not lol
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PostSubject: Re: catalytic converter delete?   Mon Sep 22, 2008 7:35 pm

man i cut the converter off today and what a difference it makes! the car moves a whole lot faster now than it did before! im very pleased with it! take that environmentalist!
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PostSubject: Re: catalytic converter delete?   Mon Sep 22, 2008 9:43 pm

The exhaust sounds cooler, too! Btw, there is very strong evidence that supports the deletion of cat converters are not as bad for the environment as one would expect.

While cat converters do reduce emissions of nitric oxide, nitrogen dioxide, and hydrocarbons to reduce smog formation, and they reduce carbon monoxide emission, which is harmful to breath, they also create LOTS of CO2, a greenhouse gas, and the main factor believed to create global warming.

So, if you don't live in a smoggy city, and you don't stand around with the engine running in the garage, deleting your cat does lessen your car's emissions of CO2 gas. Like with anything, it's a trade-off, of course.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
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KillaKeninaRiv
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PostSubject: Re: catalytic converter delete?   Tue Sep 23, 2008 9:58 am

i wish i had done it sooner instead of my uncles idea of cutting a slit in it and knocking a hole in it. the sound and takeoff makes his idea look moronic lol
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PostSubject: Re: catalytic converter delete?   Tue Sep 23, 2008 6:40 pm

my car just passed its first inspection with the headers and no cat. Here in TX they are very much required.

just clear the cars computer of codes and passed "with no problems whatsoever".

just FYI for anyone wondering.
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PostSubject: O2 emulator   Mon Apr 06, 2009 9:23 pm

if I delete the cat, and the ses light comes up, will it affect performance in any way? I'm gonna be doing headers very soon and gonna delete the cat and want to know if I should get the o2 emulator with it.
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PostSubject: Re: catalytic converter delete?   Mon Apr 06, 2009 9:38 pm

the rear 02 is an emissions only sensor. it does not command anything, so no it will not effect performance. if the ses light bugs you you can either get a tune to delete the code, or buy an 02 emulator from zzp (or clubgp if you are patient).
only thing to be careful of if you decide not to take care of the light, you will not know if the care actually does have a problem because the light will already be on.

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PostSubject: Removing CAT   Thu Sep 17, 2009 2:48 pm

I have been thinking about removeing the Catalytic converter.
(i just passed the everyyears carcheck so i have a year time till i have to go there again. So i thinked one cheep way do make the cars exhaust gases floud out smoother would be removing the cat.


But somuch as i know the riv has 2 lambda cencors
one front of cat and one beheind.
Rick told me that if i remove the cat or the cat whti the rear lambda sencore
then the car will light on the service engine light cos it sences that the fuel mixture is not right and the cat isent doing its job.

is there any plug whti a chip what i could but in the lamba plug? so it gives the PCM the info it wants to know.

and 2nd question....if the cat is off and service engine light on will the pcm start to change the fuel mixture? ''less fuel more air'' or will everythign else just stay normal? expect the service engine light.


hope there is someone who has removed the cat and knows what to do to shut the light off.

(sorry about my crapy english)
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 7:41 pm

Is there anybody out there that has removed the Cat completely (I know there are at least a few) that can help Timo and myself understand what it is he needs to do as far as a O2 emulator and PCM reprogramming.
Remember he is in Finland but he can ship his PCM here while his car is down for a paint job if anyone can help with the PCM and just some general knowledge of what all needs to be done and if it's feasible to do.
Thanks in advance for anyone who can help us understand this better.
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:05 pm

I think Timo's car is a '95, which means OBD-I and no PCM reprogramming. Not sure what you can do for '95s
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:12 pm

deekster_caddy wrote:
I think Timo's car is a '95, which means OBD-I and no PCM reprogramming. Not sure what you can do for '95s

Check his sig '96.
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:22 pm

my 95 has no cat. the ses light has been on for awhile now even bofore the cat was removed. sinister performance will custom make a chip for me with the no cat in mind,and a egr delete. hey timo...why dont you contact ryan at sinister and have him send you a custom chip for your car? its about $50..and a few extra $ for shipping..
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:26 pm

L67 wrote:
deekster_caddy wrote:
I think Timo's car is a '95, which means OBD-I and no PCM reprogramming. Not sure what you can do for '95s

Check his sig '96.

oh my bad, I didn't think there was any text in that sig, just the picture.

skip my post.

anyway, I have headers and a HF cat, and never tripped the rear O2 codes. I have deleted the codes for a few GTP drivers.
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:27 pm

He has a 1996. Does he need a chip or just reprogramming of his PCM.?
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:29 pm

sinister has one in the works for all my mods as soon as i get the $ timo can do the same. does he have a 95?
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PostSubject: Re: catalytic converter delete?   Thu Sep 17, 2009 11:34 pm

when i took out my cat on my 96 i only had a SES light come on during long trips. Otherwise the car never ran out of spec even WOT and idle with no cat.

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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 1:48 am

I have a 1996

so much as i remember of the carmechanic scool i passed
that in fuel injection engine is importent the 1st O2 emulator what will let the car know if its using the right fuel mixture. if not then it just changes the mixture by giving more air or fuel if needed.

i guess the 2nd is just for leting the PCM know if the cat is doing it's job? if it gets bad and wont be catalyting the exhaust gasses anymore then the service engine light comes on?

well just checking if it relly is so how i guess..

about PCM i guess it would be cheeper if someone buys a used pcm from usa junkyard reprograms it and just ship here if needed?
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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 2:16 am

all sinister need are the # off your stock ecm. contact them and find out if the 96 differs from the 95. cant you use a tuner on the 96 if not?
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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 4:22 am

The Riv's OE cat when designed/made was very low restriction, and I would not bother removing it. It was made with a new "thinwall" substrate (now commonly used) that minimized the surface area that impedesthe flow of exhaust gases. Unless your cat is clogged with soot due to misfueling or whatever I would leave it right where it is.

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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 5:51 am

i have not checked the cat yet...(visualy)
it cone through the tests and everythign showed fine.
if i would have a chance would get a highflow cat but here i can only dream about it.
got now alot of pipe materjal thp for building a new exhaust from downpipe till the exhaust tips whit 2 highflow sport muflers.
could make a straight pipe in the place where the cat would be whit flanges so i could but it anytime i need tho.
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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 6:02 am

I think my point is that a highflow cat won't flow better than the cat you have IFF the cat you have is the factory AC cat.

WHat kind of pipe did you get for building your exhaust? what kind of steel and what diameter, and are you going to buy or make a Y-pipe?

Albertj
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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 7:44 am

Timo,
If you want I'll get you a price for a Magnaflow 3" High Flow Cat that you could weld flanges on and put in for your inspections or run it all the time.
That's what I put in mine along with the headers. I keep mine in all the time even though I welded flanges to make it easy to take out if I want to.
I'll price it out and weigh one then you can decide.
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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 9:02 am

sounds good!
got 3'' pipes and yes will use a Y pipe after what will be 2 sport muflers and after muflers 2 stainless OO tips what i MAYBE cut a bit into the rear bumper lip.

But have to start mesure how i will fit the muflers down there.
hope i don't have to cut the spear tire space for more room.
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PostSubject: Re: catalytic converter delete?   Fri Sep 18, 2009 12:55 pm

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.
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