Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Replacement catalytic converter

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BlazinRojo, May 14, 2001.

  1. BlazinRojo

    BlazinRojo 1/2 ton status

    Joined:
    Mar 29, 2001
    Posts:
    111
    Likes Received:
    0
    Location:
    San Luis Obisbo, CA
    Does any have any suggestions for a higher than stock flow catalytic converter that is still emissions legal, or is that to much to ask?

    Shutup Brain or I'll stab you with a Q-Tip - Homer J. Simpson
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,976
    Likes Received:
    189
    Location:
    Roy WA
    Ever since I saw a cat converter swap article in a Corvette mag, I have been REAL suspicious of aftermarket "high flow" cats.

    This article put the car on the dyno for a base test. OK, got X HP. Then they swapped the cat converter, and the pipes, and got X+ HP. All well and good. But even in the article, they mentioned that the stock cat was BROKEN internally. Now, how can you compare a used, or used and broken in this case, with a brand new cat?? Thats like dyno testing a 1968 350 with 500,000 miles on it and the exact same motor except brand new!! Of course there will be differences, but I don't beleive I've ever seen an ad or comparison that said that both cats were new when tested. Cats get plugged up and crumble as they get older, so its not a valid comparison. More "flow through" area, (such as bigger diamter in/outlet, and larger catalyst area) AS LONG AS the converter material flows enough, would be more efficient in evacuating exhaust gasses though.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  3. BlazinRojo

    BlazinRojo 1/2 ton status

    Joined:
    Mar 29, 2001
    Posts:
    111
    Likes Received:
    0
    Location:
    San Luis Obisbo, CA
    All-right, let me rephrase that. What about a good aftermarket replacement cat that still passes the sniffer. Not necessarily high flow.

    Shutup Brain or I'll stab you with a Q-Tip - Homer J. Simpson
     
  4. ChevyCaGal

    ChevyCaGal 3/4 ton status

    Joined:
    Dec 16, 2000
    Posts:
    8,158
    Likes Received:
    0
    Location:
    Sacramento, CA USA
    Hedman makes a high performance cat. It's about $140 I think? Try DynaMax as well, they run any where from $90 to about $180. Where in CA are you? I live in CA too in Sacramento. There's a place here you should call if you live in the area. One of the best exhaust places in the state. They specialize in illegal exhaust but if you want to go legal they can do an awesome job.....I have some stuff writen down somewhere about cats....I'll see what I did with it. It was part numbers and different specs. I am redoing my exhaust and am playing the same fun smog games as you are. It's a huge pain, but if you get the right set up with a cat you can run just as good as guys without them.

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  5. '73 K5

    '73 K5 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,763
    Likes Received:
    0
    Location:
    Kansas
    Too bad your in Cali...otherwise you could use the "hacksaw" method to take care of your cat. Since you can't really do that try <A target="_blank" HREF=http://www.summitracing.com>http://www.summitracing.com</A>

    '73 K5
    Chevy good...Ford bad
     
  6. newyorkin

    newyorkin 1 ton status

    Joined:
    May 8, 2001
    Posts:
    16,555
    Likes Received:
    157
    Location:
    Los Estados Unitos
    y'know, I'm still not sure if my cat's a problem or not yet. I guess I'll leave that "test" pipe in a little longer to see if I notice a difference...

    Ratch
    I could swear there was a trail around here... Right around where those new condos are...
     
  7. walt88

    walt88 1/2 ton status

    Joined:
    May 24, 2000
    Posts:
    430
    Likes Received:
    0
    Location:
    Monmouth County, NJ
    Got a Walker High Flow. After it was put on i passed inspection, but lately my truck has stunk REAL bad. I mean undrivable. It was the diverter valve, fixed that but it still stinks. I think something is wrong, or its the cat.

    [​IMG]<font color=red>1988 Chevrolet K5 Blazer, Middletown, NJ (07737).</font color=red>
     
  8. 90K5

    90K5 1/2 ton status

    Joined:
    Jun 1, 2000
    Posts:
    3,719
    Likes Received:
    0
    Location:
    Lubbock, TX
    I have a Catco and its holding up well. Made my truck louder ,and I'm sure I picked up a few ponies. Considering the insane amount GM wants for a new stock converter, there is no reason not to put on an aftermarket one. Mine was $100.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  9. ChevyCaGal

    ChevyCaGal 3/4 ton status

    Joined:
    Dec 16, 2000
    Posts:
    8,158
    Likes Received:
    0
    Location:
    Sacramento, CA USA
    Do you mean it stinks as in smells? If so is the smell rotten eggs? Cats get like that...you can buy a deoterizer(sp?) to run through it and it helps remove the smell....

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  10. 1TUFF89

    1TUFF89 1/2 ton status

    Joined:
    Apr 6, 2000
    Posts:
    109
    Likes Received:
    0
    Location:
    West Point, Virginia
    I bought my high-flow from truckperformance.com. I bought the universal one because it was much cheaper and I had my local muffler man install it for $30 bucks. It was only around $80 delivered to my door. They also make a direct fit cat which obviously costs more. It sounds great and I can tell a difference when I hit the gas. Check out the web site.

    CHEVY - "THE HEARTBEAT IS GETTING LOUDER"
     
  11. StoneyK5

    StoneyK5 1/2 ton status

    Joined:
    Jan 4, 2001
    Posts:
    472
    Likes Received:
    0
    Location:
    Birch Bay, Wa.
    I had my truck in the tranny shop and the mech told me the cat was plugged and I wasn't getting the exaust through it, so I had him change it for an aftermarket that he suggested. My old cat was full of powder, he dumped some in the trash to show me...I can sure tell the difference with power now....

    83K5 Silverado
    What was that bump?
     
  12. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    I had gotten a high flow cat on my truck a few years back and it clogged up after a year...had it replaced and it clogged up again. I bought a regular cat and it was fine. I rebuilt the carborator and tested and tweaked....did everything you could to see and make sure it wasn't running rich...o2 sensor, you name it. I don't know what brand it was, but a freind of mine went to the same muffler shop and they had problems with there's too. Another freind had a brand new truck and got one put on and it clogged too. Make sure there's a warrentee is the moral of my story I guess [​IMG]

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,976
    Likes Received:
    189
    Location:
    Roy WA
    I have been told, and heard, that the sulfur smell from a cat means that something is not right in its operation. The cats are supposed to be X distance from the motor, so if they are not getting hot enough, or too hot, that coul dbe a problem, and as I understand it, WILL ruin the cat, or at least ruin its effectiveness. My friends car with aftermarket hig flow cat smells like this as well...

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     

Share This Page