Adding 02 and cats to an '89 Euro Mondial t without cats | FerrariChat

Adding 02 and cats to an '89 Euro Mondial t without cats

Discussion in 'Mondial' started by Marco Bussadori, Oct 8, 2007.

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  1. Marco Bussadori

    Marco Bussadori Formula Junior

    Aug 6, 2007
    430
    London
    Full Name:
    Marco Bussadori
    I hope you can spare a moment for the mere mortal oh awesomest Ferrari god...

    I have an Euro Mondi t from '89 with no cats. I know this is great for the performance lovers, but I do use it with my family and little child. I have to admit I love the smells etc, but my wife and son hate the raw exhaust smells.

    I thought of bolting on a set of F cats or aftermarket kits (Hyperflows).

    I understand this will need to have an 02 sensor installed per cat and that they will have to be connected to the ECU in some fashion. I understand that with the non cat, some pin is shorted out.

    Secondly, I hear there are some CAT eCUs that need installing - do these only sense the temperature for the overheat warning? If so I guess they should be pretty standard Bosch parts and not Ferrari only right?

    My Questions would be:
    1) How to connect an O2 Sensor to the Motronic 2.5 ECU
    2) What is the function of the "Cat ECU" - I understand it to be only connected to the "slow down x-y" lights for overheating warning
    3) Aside from power reduction, will adding O2 sensors have a negative effect on the health of the engine - I was told adding Lambda will lean the mixture
    4) At wide Open Throttle, the 02 sensor is ignored for standard tables right and mixture setting is only used at idle/partial
    5) Does the cat system need the air injection into the exhaust? My engine does not have this.
    6) Is running the MAFs at 403 ohms (Factory +20), "extremely" lean or just a little on the lean side?

    If you have the time I only have the most gratitude.

    Marco
    P.S. What power adding tweaks have you found work well on the F119 Engine?
     
  2. Michael B

    Michael B F1 Rookie
    Owner

    Apr 28, 2004
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    Michael
    Marco,

    Add the cats, forget the 02 sensors and the temp probe. If all you want is a better exhaust scent then bolt on the hyperflows and go. Block off the 02 bung with any bolt that fits and cap off the temp probe hole. For that matter have hyperflow sell you units sans holes.
     
  3. Marco Bussadori

    Marco Bussadori Formula Junior

    Aug 6, 2007
    430
    London
    Full Name:
    Marco Bussadori
    No danger of overheating? Without 02 how do I know the mixture isn't drifrint and chucking too many HC's to the CAT, overheating it and cindering my beloved wif... I meant car?
     
  4. SonomaRik

    SonomaRik F1 Veteran

    as a note, you of course know this is a 348 engine. You might want to try and cross-thread this into the 348 section. Never understood why 348 are not in this section and have their own under the 355, but so goes the way of fchat.
    rik
     
  5. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,742
    The twilight zone
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    Help me get this thing finished! https://gofund.me/39def36c
    There is a huge danger of overheating and setting the car on fire. Leave them off. If you must have them, you need and ECU the reads an o2 sensor.
     
  6. Michael B

    Michael B F1 Rookie
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    Apr 28, 2004
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    Michael
    You really think so Mark?

    I would beg to differ but will listen to an educated opinion. I would believe that a current high performing cat (say 100 Cel) would have no trouble with the heat & not add any sort of concern on a 3.4 liter like the Mondial T. I think that a good running 3.4 liter would be hard pressed to overheat a converter that is capable of working with say a 6.0 liter.

    But please enlighten me if you have a different theory.

    I have personally installed dozens of real performance converters on like vehicles with no 02 or temp probe monitors with zero adverse effects for literally years & years.

    Oh & Marco. You could always test with a inexpensive AFR (air fuel ratio) meter before install & after just to make you feel good about the change. EGT (exhaust gas temp) guages are cheap too if your worried about that. All of that is a lot easier than your original thoughts and can be just as effective.
     
  7. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,742
    The twilight zone
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    Help me get this thing finished! https://gofund.me/39def36c
    My cat set my car (QV) on fire a few years back after 4 cyl shut down cruising on the highway......so I'm a little scared of them.

    The number of cells helps the cat work and flow well, but getting rid of the heat of combustion from the fuel in the cat is surface area or the cat shell and air flow. A rich mixture will make a lot of heat in the cat, often more than it can handle, so anything that causes a rich mixture is a problem, which is why ferrari uses the "slow down" or "cat" light. As long as nothing goes wrong, the cat will be fine, but if a cylinder or 2 shut down, fuel pressure goes up (stuck regulator), malfuctioning sensor, you could have a problem.
     

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