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355 test pipe and check engine light

Discussion in 'Technical Q&A' started by BoulderFCar, Jun 9, 2005.

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  1. BoulderFCar

    BoulderFCar F1 World Champ
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    #1 BoulderFCar, Jun 9, 2005
    I think I know the answer for this but thought I'd give it a go. If you put test pipes on an OBD2 '97 355 is there a way to re-program so the check engine light stays off? Or can you use a resistor to spoof it? Because the sensors read upstream and downstream of the cat. I doubt it but I thought I would ask.
     
  2. FIAutoSports

    FIAutoSports Formula Junior

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    #2 FIAutoSports, Jun 9, 2005
    there are O2 simulators you can get to eliminate the CEL. None are exactly for the Ferrari though. But if you can get a multimeter and with the car running, record the voltage, then get a O2 sim, see how much that resistance makes, and get resistors to match up what is necessary.
     
  3. BoulderFCar

    BoulderFCar F1 World Champ
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    #3 BoulderFCar, Jun 9, 2005
    This is definately a job that calls for an asbestos long sleeved shirt.
     
  4. fazzaz1

    fazzaz1 Karting

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    #4 fazzaz1, Jun 9, 2005
    Take the check engine bulb out
     
  5. f355spider

    f355spider F1 World Champ
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    #5 f355spider, Jun 9, 2005
    Not recommended, there are more things than the O2 sensor that can trip the CE light. By removing the bulb, you lose those possible warnings.
     
  6. cscott

    cscott Formula Junior

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    #6 cscott, Jun 10, 2005
    Does not matter though, as long as the light is on you will not know what else trips it so have it disconnected.
     
  7. russell

    russell Karting

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    #7 russell, Jun 10, 2005
    i thought if you plug the cat sensors into the test pipes it will not trigger the light?? we have sold many sets and not heard of a light problem. Am i missing something?
     
  8. Ricambi America

    Ricambi America F1 World Champ
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    #8 Ricambi America, Jun 10, 2005
    You've sold 355 pipes? If I'm not mistaken Hyper-Flow is really trying to avoid the 355 pipe market because of all the CEL problems that'll ensue. In an OBDI or earlier car, it's not quite as difficult to overcome and that's why the 348 pipes are big sellers. The modern stuff however is a different story.

    IMHO, the 355 HyperFlow cats flow basically as well as a straight pipe. You'll get great sound, stay legal, and avoid the wrath of parkerfe. What could be better?

    Yeah, they're somewhat expensive. Remember, they're basically handmade in extremely small batches, for a very very small market. If you think the cats are expensive, try pricing some 355 shocks or the shock actuators... that'll give you vertigo.

    -Daniel
     
  9. russell

    russell Karting

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    #9 russell, Jun 11, 2005
    i would asume the straight pipes we have sold are for track use. We recomend ricambi when needing cats. I was just wondering about the Check engine light issue with straight pipes.
    [email protected]
     
  10. BoulderFCar

    BoulderFCar F1 World Champ
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    #10 BoulderFCar, Jun 11, 2005
    After multiple PM's, a couple of phone calls and this thread, here's my take on the CEL and test pipe issue:

    SD2 can't be re-programmed and I am unwilling to pull the bulb on the check engine light. It's a pretty smart system and I don't want to lose visibility to the other parameters. I don't recall the exact number, but there are probably 25-30 other things you see with SD2.

    You can keep he check engine light happy with O2 simulators on the downstream side of the test pipe. I didn’t know they existed until this thread. They do and cost about $25. It spoofs the system and provides the same input as the O2 sensor. You hook them up on the downstream side of the test pipe.

    My main motivation to run without the cats was to get minimize engine compartment heat as I have a high degree of confidence that my cats have a long way to go. In the end, I am going to do a full engine detail and I’ll probably replace the factory cats with Hyper-Flow to get the sound and appearance.
     
  11. cgperry

    cgperry Formula Junior

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    #11 cgperry, Jun 16, 2005
    Don't forget that 95 355s aren't OBDII, so doing test pipes on those is no big deal. I would guess that a lot, if not most, pipe sales have been for 95 cars.

    I think later cars would be better off with Hyperflows but I'm interested to hear how yellow_355s experiment turns out...
     
  12. f355spider

    f355spider F1 World Champ
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    #12 f355spider, Jun 16, 2005
    I guess I wasn't clear, I would not recommend putting test pipes on a later 355 without the O2 simulator. Running around with the CE light on, or deactivated is not a risk worth taking. But YMMV.
     
  13. parkerfe

    parkerfe F1 World Champ

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    #13 parkerfe, Jun 16, 2005
    The few miles you are likely to put on a track car with a test pipe shouldn't be a problem anyway. Because I know you wouldn't drive a car on the public roadways after you have disabled part of the emission system.
     
  14. CornellCars

    CornellCars Formula 3

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    #14 CornellCars, Jun 16, 2005
    "You can keep he check engine light happy with O2 simulators on the downstream side of the test pipe. I didn’t know they existed until this thread. They do and cost about $25. It spoofs the system and provides the same input as the O2 sensor. You hook them up on the downstream side of the test pipe."

    Tom, do you mind if I ask where you found the O2 sensor spoofs for $25?

    Thanks,

    Jason
     
  15. cgperry

    cgperry Formula Junior

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    #15 cgperry, Jun 16, 2005
    Good lord, Franklin, don't you ever get tired of reminding us of your stand on emissions equipment?

    Do you realize that if you multiplied the amount of time you spend typing dire emissions warnings to FChat by your billable rate, that you would have more than enough money to buy that Ford GT you're fond of? By doing nothing more than keeping your unbillable opinions to yourself?

    Isn't there an EPA Blog you could find to use as an outlet? And why the heck isn't there a Toyota Prius in your fleet?
     

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