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Effects of taking out my cat?

This is a discussion on Effects of taking out my cat? within the Firebird / WS6 forums, part of the Vehicle Specific category; Yeah ill end up getting it tuned pretty quick here. I was bored today so I took the catback off ...

  1. #21
    Member Dave-TransAm's Avatar
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    1997 Firebird M5

    Yeah ill end up getting it tuned pretty quick here. I was bored today so I took the catback off and I'm just running on the stock headers and cat. It sounds amazing but will it do any damage to anything?

  2. #22
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Guys, this guy has a 94...he might not even have rear O2 sensors. Gut them and go!

  3. #23
    Member Dave-TransAm's Avatar
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    Quote Originally Posted by Cutlass View Post
    Guys, this guy has a 94...he might not even have rear O2 sensors. Gut them and go!
    im pretty sure i do but dont quote me on it haha

  4. #24
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Rear O2s are a OBD II thing. OBD II started in 1996, but some 95s vehicle also had some OBD II things like rear O2s.

  5. #25
    Moderator 35th-ANV-SS's Avatar
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    never even looked at the year of vehicle. Good catch!

  6. #26
    Junior Member Steve's LS1's Avatar
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    98 Camaro Z28

    well i have a 98 ls1 camaro and i put lt's on it and its still open headers right now and i drove it around the block with no o2 sensors in and no lights never came on, and the car runs and idles fine, is this a problem????

  7. #27
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by Steve's LS1 View Post
    well i have a 98 ls1 camaro and i put lt's on it and its still open headers right now and i drove it around the block with no o2 sensors in and no lights never came on, and the car runs and idles fine, is this a problem????
    No.

  8. #28
    Senior Member TLS_Addict's Avatar
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    Thats a MAF car correct and not the SD right?

    You can get a cable and tune the thing yourself with your laptop.

  9. #29
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    You won't pass smog here in The Valley of The Sun without the cat on a 94. Be prepared to swap out the pipe every 2 years.

    IMHO, that's a thing I would do if I had an early LT1...

  10. #30
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    Quote Originally Posted by TLS_Addict View Post
    Thats a MAF car correct and not the SD right?

    You can get a cable and tune the thing yourself with your laptop.
    You are correct. 93 was the only speed density year for LT1 engines in an F-body...

  11. #31
    Member Dave-TransAm's Avatar
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    Quote Originally Posted by 67CamaroRSSS View Post
    You won't pass smog here in The Valley of The Sun without the cat on a 94. Be prepared to swap out the pipe every 2 years.

    IMHO, that's a thing I would do if I had an early LT1...
    Yep that's what I'm going to do.

  12. #32
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    black
    firebird formula 99

    you can trick the car by using anti spark plug foulers buy four 18mm drill them out to i think a 1/2 inch or a lil more take two of the foulers and screw them onto your o2 censor and screw it back in and clear the code

  13. #33
    Senior Member Too Fast's Avatar
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    ^^^Huh?

  14. #34
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    its just a spacer a cheap way to fool the car to think that the cats are still there once you take your cats out it throws the code i did it to my car after i took out my cats and cleared the code and its never came back

  15. #35
    Moderator Cutlass's Avatar
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    Quote Originally Posted by Too Fast View Post
    ^^^Huh?
    He's talking about mechanical O2 simulators.
    I made a mechanical O2 simulator for my Blazer with a hollowed converter and it worked great. Go to the parts store and buy 2 Help!brand spark plug anti-foulers.


    Drill out the one to make room for the sensor and then screw them together like this:


    This spaces the O2 sensor away from direct exhaust flow which makes the sensor read lazy because it only sampling a small amount of exhaust and simulates a fully functional converter.

    It works!!! I've tried it.

  16. #36
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    ^^ What's funny is that is what Innovate wants me to do for my wideband. Any time I open my cutout or mash WOT, the sensor wigs out and goes into error mode.

  17. #37
    Senior Member Too Fast's Avatar
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    Quote Originally Posted by Cutlass View Post
    He's talking about mechanical O2 simulators.
    I made a mechanical O2 simulator for my Blazer with a hollowed converter and it worked great. Go to the parts store and buy 2 Help!brand spark plug anti-foulers.
    Click for full size

    Drill out the one to make room for the sensor and then screw them together like this:
    Click for full size

    This spaces the O2 sensor away from direct exhaust flow which makes the sensor read lazy because it only sampling a small amount of exhaust and simulates a fully functional converter.

    It works!!! I've tried it.

    OIC.

    That would probably work a lot of the time, since the exhaust sample is so small. You might get an occasional code tho. How long has yours been in, Cutlass?

  18. #38
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    I sold the blazer, but had it working fine for about 5 or 6 months of daily driving.

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