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Thread: J-spec cats. are they 3-way converters?

  1. #1
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    J-spec cats. are they 3-way converters?

    hey, i am researching some stuff related to getting late model Supras.

    is the j-spec cats a 3-way regulated catalytic converters?
    are they the same on US, EU or UK specs?
    are they same for all years (1993 to 2002)?

    according to the manual for a 1997 US-spec, both cats is 3-way in US-specs.
    i am assuming they are 3-way, but assuming is different from knowing

  2. #2
    Helpful Club Member Scooter's Avatar
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    I'm not sure what 3 way means but I do know the later jspec larger second cats are not the same as the earlier jspec ones. The early ones have a proper 'honeycomb' section visible the later ones have a straighter through bore pipe.

    I've not seen any differences in first cats ( small ones nearest the turbos)
    Number 8 ...........doing my best to keep
    Number 9 ........been and gone!
    Number 10 ........on its way

  3. #3
    I'm a newbie MEMBERSHIP DUE
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    Three-way just means it does 3 tasks. removing CO, HC and NOx.
    more to read here if interested:
    https://www.open.edu/openlearn/ocw/m...able=1&id=2492

  4. #4
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    the US catylytic converters are different from the JDM ones, theres only one in the downpipe, and theres one in the mid-pipe as well. If you know of a stock OEM downpipe with cat for sale lemme know!

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