cat swap?

Discussion in '80-Series Tech' started by livelarg, Nov 8, 2005.

  1. livelarg

    livelarg

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    My cats are 220K old, and i want to put some freer flowing cat in thier place.
    I was wondering if I could get a cat from a car with with a V8 or something and one in the place of the dual cats that I have now? Looking for a cheaper way to get new cats and higher flow.
    Any Ideas?

    Thanks
    Kent
     
  2. shocker

    shocker

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    Since you live in OK, I don't think gov't regulation should be a problem.

    Look to a company like Flowmaster for some high-flow cats. Not sure if anyone has gone this route.
     
  3. jaxcruiser

    jaxcruiser

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    I cut mine off and put a flowmaster 40 series on it and dumped it by the rear passenger tire. I noticed a little more power at the seat and it sounds awesome up until 3,500 rpm's then it whines like a weed wacker but it is a beautiful thing try it.
     
  4. livelarg

    livelarg

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    the flowmaster would be great, but I was looking for a cheaper mod that might work well. If a salvaged V8 cat would work, then I could find one that might fit in a variety of places.
    The idea of putting back by the rear tire sounds good, but I thought that it had to be near the engine so that it would get to a sufficient operating temperature to be efficient. If it isn't going to work as is supposed to, I might as well not put one on there.
    Anyone ever try to put another cat from another car on thier truck?
     
  5. Walking Eagle

    Walking Eagle

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    Jax is confusing muffler with cat - flowmaster 40 series is a muffler.

    you're running a '91, which has the two cats side by side right? I read somewhere that Gingericfj80 used a dual inlet out of a dodge truck to replace both cats. Like this

    http://store.summitracing.com/defau...earchinresults=false&N=0&target=egnsearch.asp


    or you can run a single for under $60

    http://store.summitracing.com/defau...earchinresults=false&N=0&target=egnsearch.asp


    I wouldn't buy one out of a junkyard if that's what you're going for, for $60, it's best to just put a new one in.
     
    Last edited: Aug 14, 2006
  6. livelarg

    livelarg

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    the dual inlet from the dodge might be cool, it seems like it would be a higher flow than the stock. It seems like the single cat might be more restrictive.
    It might be better to just pony up the dough and get a good one.

    Thanks
     
  7. ginericLC

    ginericLC Wagon Wheeler! SILVER Star

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    I did the dodge single cat. Two inlets and one outlet. I thought it reduced the power some but I wasn't comparing it to stock. I ran catless for almost 2 years prior to installing the dodge cat. Flow numbers of the dodge cat are higher than a stock 91. But that is not the primary advantage in my mind. I liked that it was flat vs. vertical. It also didn't have all those shrouds around the cat body. I hated them on my 91 factory cats as stuff would get stuck in them and they rattled. I did leave the heat shield on the bottom of the body so things didn't get toasty.
     
  8. green_machine

    green_machine

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    did you weld in a second bung for the other o2 sensor?
     
  9. Walking Eagle

    Walking Eagle

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    Do the '91's have 2 O2 sensors? I thought that was mostly an OBDII on most cars.
     
  10. livelarg

    livelarg

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    I've been looking for a deal on a Dodge Cat. Thanks for the info. considering that my cats have 220K on them, I think the dodge cat will be better.
    Walking eagle: my truck only has one O2 sensor. I plan to change that when I am doing the cat change. It has 22K on it also.
    My truck has been running rich. With any luck, this will fix that too.
    Thanks
    Kent
     
  11. CJF

    CJF

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    You sure???

    Stock '91 should have two: one on each downpipe, just before the (two) cats.

    Curtis
    91FJ80
     
  12. ginericLC

    ginericLC Wagon Wheeler! SILVER Star

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    I used the Dodge cat. I left both (1991) pre cat 02 sensors in the stock location. It was right after the 02 sensors that the new cat was installed.
     
  13. livelarg

    livelarg

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    yes, it has two. thats gunna cost a bunch to replace both of those!

    Ginericfj80: can you tell me what dodge truck your cat is for?

    thanks
    Kent
     
  14. green_machine

    green_machine

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    unless your throwing codes, or at over 90k on the original sensors, I would not replace them. Remember, sensors CAN be cleaned.

    j
     
  15. sdbrassfield

    sdbrassfield

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    You have to worry about O2 sensor(s). 91 should have 2 cats w/ a sensor for each cat. Need to find a place for both sensors....Your cats should be plenty blown out. You want better flow, find a good exhaust man and run duals and a flowmaster from the cats back. Sounds and breaths better, better mpg (it needs all it can get), and runs cooler on those hot summer days...A good exhaust man should be able to do this for 3 bills or so...
     
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