Removing Catalytic Converters and Exhaust Cat Temp ECUs | FerrariChat

Removing Catalytic Converters and Exhaust Cat Temp ECUs

Discussion in '308/328' started by ItalianProjects101, Dec 22, 2023.

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  1. ItalianProjects101

    Feb 5, 2023
    142
    Full Name:
    D
    I hope you're all doing well. I've been contemplating some modifications to my 1978 Ferrari 308 US spec, and I'm considering removing the catalytic converters and straight piping it into the backbox for a bit more of that classic Ferrari sound. I know this is a bit controversial, but I'm looking for advice from those who have experience with such modifications.

    Here's the plan:
    • Remove catalytic converters.
    • Straight pipe into the backbox for that iconic Ferrari exhaust note.
    Now, my main concern is dealing with the Exhaust Cat Temp ECUs. I've attached a picture of the ECUs I'm referring to. Can anyone guide me on how to properly remove these and what I need to eliminate in terms of wiring? I want to make sure I do it right so I don't end up with "Slow Down Cylinder 1-4 & 5-8" dashboard lights constantly on.
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    I understand that this modification might not be everyone's cup of tea, and I respect that. I'm just looking for technical advice from those who have been down this road before.

    Thanks in advance for your help and expertise!
     
  2. Alden

    Alden F1 Rookie
    Rossa Subscribed

    Apr 25, 2010
    2,936
    Central Florida
    Have you thought about not removing the catalytic converter but just gutting it instead, that's what was done on my 1988 3.2 Mondial, sounds great. No issues.
    Alden
     
  3. Brian A

    Brian A F1 Rookie

    Dec 21, 2012
    3,088
    SanFrancisco BayArea
    Full Name:
    1983 US 308 GTS QV
    It is a very simple system. The ECUs use the signal from the thermocouples to send power to the "Slow Down" light bulbs. If you remove the ECUs, the bulbs will no longer light.

    The system is stand-alone: nothing else is affected by removing the ECUs or any other part of the system.
     
  4. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,445
    Austin TX
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    Brian Crall
    Then fix that wiring rats nest.
     
  5. ItalianProjects101

    Feb 5, 2023
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    definitely will, previous owner thought it would be a great idea to install some crappy alarm
     
    mike996 likes this.
  6. ItalianProjects101

    Feb 5, 2023
    142
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    Will also be creating a custom 3d printed fusebox to fit the same mountings as the original but will use blade fuses
     
  7. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,445
    Austin TX
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    Brian Crall
    In a car that age something like that is inevitable.
     
  8. rwbolt1

    rwbolt1 Karting

    Sep 10, 2006
    77
    Boerne, TX
    Full Name:
    Rodney Bolt
    Hmmm... What's involved with gutting it out? I'm considering buying a "test pipe", but your solution might be equally good. Definitely cheaper. (And I don't care about keeping original parts).
     
  9. dave80gtsi

    dave80gtsi Formula 3
    Silver Subscribed

    Nov 3, 2003
    1,819
    Ohio
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    Dave Meredith
    Assuming that the honeycomb is ceramic, it is very brittle and can be easily removed by breaking it up with a sledge hammer and a crowbar.
     
  10. kcabpilot

    kcabpilot Formula 3

    Apr 17, 2014
    1,530
    California SF bay area
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    Paul
    Probably better to preserve the cats as a subsequent owner may want to reinstate them. As for the test pipes, I made a couple for about forty bucks, just buy the flanges and a length of pipe on Summit and have the dimensions and orientations duplicated. I just tie wrapped the probes to the frame and left all the wiring and boxes intact so they could be remounted at any time in the future, no problem with lights. It's a bit louder but to be honest, not that much of a difference.
     
    Rifledriver likes this.
  11. Alden

    Alden F1 Rookie
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    Apr 25, 2010
    2,936
    Central Florida
    I agree with the assessment that it would be better to leave it original, so perhaps gutting the cat, with a sledgehammer and a crowbar and leaving all of the wiring intact would be the best solution, as I said, I did not perform this on my own car, so I don't have a comparison for before and after sound, but I think it sounds very good, and everyone else seems to think so too!
    Alden
     
  12. ItalianProjects101

    Feb 5, 2023
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    I will be replacing the entire backbox to make it like EU spec so that's not an option. I will be keeping all the original parts though for the next owner (if that ever happens) to put it back to stock
     
  13. Alden

    Alden F1 Rookie
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    Apr 25, 2010
    2,936
    Central Florida
    #13 Alden, Dec 23, 2023
    Last edited: Dec 23, 2023
    So just tie off the probes to the frame, leave the wiring in place and you're good to go!
    Alden
     
  14. ItalianProjects101

    Feb 5, 2023
    142
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    Actually probes are out of the car. Just needed confirmation about the dash lights
     

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