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Old 09-08-2011, 03:08:32 PM   #1
1dkm4me
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How much HP do catalytic converter rob

I wonder because my 80 still has a pair on it. I hate the smell, I hate what cats do to exhaust.
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Old 09-08-2011, 03:11:46 PM   #2
camaro75LT
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If they smell they have gone bad and need to be replaced
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Old 09-08-2011, 03:13:36 PM   #3
1dkm4me
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I cant say they smell smell they just change the smell to a sweetish smell. or something.

I agree they need to be not replaced but removed, here in Texas we can remove them if the car is 25 year or older.
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Old 09-08-2011, 03:15:19 PM   #4
Todd80Z28
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If they smell, they aren't working right.

Modern monolith cats don't rob much at all. I think Lingenfelter did a test with a 383 and properly-sized setup (including properly sized cat) and got about 4hp when he took it off. Hardly worth it, unless, like yours, they don't seem to be working.

EDIT: It's never OK or legal to remove a cat from any car that had one. That's a Federal law, always has been. States that don't have checks don't give a crap, though...
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Old 09-08-2011, 03:17:40 PM   #5
1dkm4me
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I agree, I thought modern cats needed to be close to heat source and have air injection if they are the dual chamber type etc.

Off they come.




Quote:
Originally Posted by Todd80Z28
If they smell, they aren't working right.

Modern monolith cats don't rob much at all. I think Lingenfelter did a test with a 383 and properly-sized setup (including properly sized cat) and got about 4hp when he took it off. Hardly worth it, unless, like yours, they don't seem to be working.

EDIT: It's never OK or legal to remove a cat from any car that had one. That's a Federal law, always has been. States that don't have checks don't give a crap, though...
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Old 09-08-2011, 09:44:51 PM   #6
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bring it to your scrap metal dealer . you should be able to get about 75 bucks or more for the platinum in it . call around for pricing . its a pretty big cat compared to todays , unless its been hollowed out . which is my suggestion, hollowing it out. visually its there , as far as the ceramic guts , its hollow . no restriction .
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Old 09-08-2011, 09:47:10 PM   #7
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Quote:
Originally Posted by 1dkm4me
I wonder because my 80 still has a pair on it. I hate the smell, I hate what cats do to exhaust.
BTW on a stock exhaust system in any 75 to 81 camaro , there was only one catalytic converter . it was under the passenger side seat. . there was 2 resonators and 1 transverse muffler on some of the later V8 camaros along with the cat . that was the problem with it , the exhaust manifolds went into a very small diameter Y pipe into the cat then back into two pipes
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Old 09-08-2011, 09:49:00 PM   #8
1dkm4me
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Quote:
Originally Posted by twozs
BTW on a stock exhaust system in any 75 to 81 camaro , there was only one catalytic converter


The PO has true duals and ceramic style cats.
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Old 09-08-2011, 09:56:42 PM   #9
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well then were not talking a stock exhaust and the cats probably rob very little . do you know the maker of the exhaust system ?
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Old 09-08-2011, 10:04:44 PM   #10
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one look at the stock setup on mid/late 70s f bodies and its no wonder these cars made no HP
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Old 09-08-2011, 10:47:53 PM   #11
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If they smell like rotten eggs, then their working.
Take them off and if your Town has Smog Enforcement then you better hope you don't get pulled over. Every infraction here, it costs $350.
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Old 09-08-2011, 11:27:51 PM   #12
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cut them off and toss them
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Old 09-09-2011, 02:24:56 AM   #13
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Ebay has catco replacement cats for short money, keeps you legal.



Sweet smell, like burning anti freeze?
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Old 09-09-2011, 02:41:11 AM   #14
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if you are worried about running them with out, you can go to your local advance and pick up some magnaflow cats that are high flowing they cost about 80 bucks and come in couple different sizes
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Old 09-09-2011, 02:58:39 AM   #15
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just run empty case cats .....that's a free flowing set up
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