Performance Cat or removing it?? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 09-10-2005, 10:58 PM   #11
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Definately remove the cat. Its much cheaper, especially if you can weld yourself, or you don't have a problem with using clamps. Removing the cat gives a pretty good gain over a high flow cat even. For example on our '90 Turbo GP coupe the stock cat was clogged so we had a high-flow unit installed. I ran the car at the track and it ran consistant 15.0-15.1'* all day. The next weekend we cut the cat off and put in straight pipe instead and the car ran between 14.81 & 14.84 all day, never went slower than that. The conditions were nearly identical and 60' times were basically the same. (they were better when it was faster but only because it had more power, the car can't break the tires loose at the track so you just mash your foot when the tree comes down) So 2+ tenths it gained from removing a brand new high flow cat. Imagine removing a 100k+ stock cat and installing no pipe instead, you'll get an even larger gain. We pulled the cat off the SSEi at around 130k or so IIRC and it woke it up a LOT.

Catalytic convertors are for environmentalists...

Also, with that setup on pump gas you won't be able to run that pulley without KR. Stick with a 3.4 unless you plan on running race gas. You'll need headers before you can go down to a 3.25, ported manifolds MIGHT allow you to run a 3.3 but I think that would be pushing it and you would probably need a mini-afc or something like that to tune your fuel to kill KR, you just simply don't have enough mods to run a 3.25. Our SSEi actually sees 1-2kr from time to time and you don't have anything done to yours that it doesn't have, and ours has a 3.4 pulley.

Shawn
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Old 09-11-2005, 12:48 AM   #12
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I don't think you can compare 2000SilverBullet'* car and Pdad'* car considering the mileage difference. HUGE difference there, and in effect perhaps two totally different cars.

Running without a catalytic converter is purely irresponsible in today'* world. I'm not a tree-hugger, but I have children.

If you lived in the US, I could simply cash in on your catless car by reporting you to the EPA. They reward narcs. Many shops will burn you this way for a little extra cash if your car is in for maintenance and they notice the Cat has been removed.

It'* illegal in all 50 States and some provinces in Canada to run without a Cat regardless of whether your State/Province requires emissions testing.
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Old 09-11-2005, 12:45 PM   #13
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Quote:
Running without a catalytic converter is purely irresponsible in today'* world. I'm not a tree-hugger, but I have children.
...So is bringing them for rides at triple digits.
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Old 09-11-2005, 01:34 PM   #14
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Quote:
Originally Posted by 2000SilverBullet
Quote:
Running without a catalytic converter is purely irresponsible in today'* world. I'm not a tree-hugger, but I have children.
...So is bringing them for rides at triple digits.
But I don't pollute when I do that.
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Old 09-11-2005, 01:41 PM   #15
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Quote:
But I don't pollute when I do that.
I bet you spewed a little methane gas when that window trim came loose...woooooo
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Old 09-11-2005, 02:05 PM   #16
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I'd be really interested to see the difference between the high-flow catalytic converts and the stock ones. I don't think you should run without any cat at all, either. Will shops install the high-flow cats for you? As far as I knew, most shops won't touch a properly working converter..
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Old 09-11-2005, 05:39 PM   #17
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the performance shop i go for my honda can do it for me ( remove the inside of my original cat) as for pollution, i dont think yiou will see a differnce from a performance and no cat, i have a friend with a high performance cat and you could see threw like it was just a piping, but it look like a cat.



as for the responsibilty part, is it you willwren that sent a video showing you doing full throttle and crying something like "look kitty, NO HANDS!! ...aahhhhh.... woohoo!"

joke


im aware of concequence of running with the cat empty. But...





as for running the 3.25, ill get a PCM, rocker 1.9, cat, , thermostat 180,probably ported manifold as soon as my wallet will let me do it.

for now, its clear ill not going down to 3.25...next spring.

, cant wait to try it!
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Old 09-12-2005, 12:02 AM   #18
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Mike, a hi-flow cat removes as many hydrocarbons as a stock cat. The only difference is a larger surface area matrix allowing more to flow at any given time. The fact that hi-flow cats are legal in the states is proof of that. You can liken it to running a cat from a full-sized chevy truck on one of our cars.

As for that vid, it was staged. I had both hands firmly attached to the steering wheel, and Pooky'* sqeal was rehearsed. Just for you guys.
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Old 09-12-2005, 07:54 PM   #19
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Quote:
Originally Posted by willwren
As for that vid, it was staged. I had both hands firmly attached to the steering wheel, and Pooky'* sqeal was rehearsed. Just for you guys.
hehe no prob willwren



ill take a look seriously on the way ill do it.

Thx all.
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Old 09-12-2005, 08:59 PM   #20
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I don't see why polution has to be sacrificed in the name of perfomance.

Cheers,
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