bypass idea | FerrariChat

bypass idea

Discussion in '348/355' started by darrenliu, Dec 15, 2008.

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  1. darrenliu

    darrenliu Formula Junior

    Jun 24, 2008
    450
    Melbourne Australia
    Full Name:
    Darren Liu
    I bought a new capristo bypass, haven't installed it yet, but my idea is as follows:

    install the capristo bypass valve
    install the new solenoid valve in series with the old one
    Run 12v to the old solenoid valve via a switch in the cockpit

    the above mods will allow me to effectively switch the bypass valve 'on and off' (normal mode or open all the time)

    All I need to do is find 12v in the engine bay, connect it to the old solenoid valve and run it to the cockpit.

    I need help on the following:

    Where to find 12v in the engine bay
    what kind of electrical connector do i need to attached to the old solenoid valve
    what kind of switch do i use

    Any comments would be welcomed.
     
  2. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #2 f355spider, Dec 15, 2008
    Last edited: Dec 15, 2008
    If you wire the new set up per Capristo, what happens if you cut power to the new electro-valve? Won't that cause the valve to open? (just trying to simplify your plumbing)

    For the connector, it is an Amp Junior Timer connector. You can get one here:
    http://www.eagleday.com/ampconnectors.html
    Scroll down, you want the two pole female one. ECK-100 You need a proper dual crimping tool too. I would imagine these parts are available at most German car dealers, as they are very common connectors.
     
  3. darrenliu

    darrenliu Formula Junior

    Jun 24, 2008
    450
    Melbourne Australia
    Full Name:
    Darren Liu
    Thanks D.
     
  4. darrenliu

    darrenliu Formula Junior

    Jun 24, 2008
    450
    Melbourne Australia
    Full Name:
    Darren Liu
    #4 darrenliu, Dec 16, 2008
    Last edited: Dec 16, 2008
    No, this won't work, the capristo solenoid valve needs 12v to close solenoid off, thereby stopping vacuum to the bypass valve, which in turn keeps the exhaust valve open (opposite to the factory valve). If you cut power to the new solenoid valve, there will be constant vacuum to the capristo valve, which will keep the exhaust valve closed.

    My way is very simple, the only tricky bit will be wiring to the factory solenoid. I would have to connect constant 12v to it via a switch located (preferably) somewhere in the car.
     
  5. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,232
    Mount Isa, Australia
    Full Name:
    Pap
    Shouldnt be too hard to find 12v and place a switch in the car mate. ;);)

    Id do it for you if I were there. If not, worst case........take it to an Auto-elec and have them do it. :):)
     
  6. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    Darren which Motronic do you have?
     
  7. darrenliu

    darrenliu Formula Junior

    Jun 24, 2008
    450
    Melbourne Australia
    Full Name:
    Darren Liu
    I have a 5.2 car, late 97 spider.
     
  8. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    Okay. You already know this, but for others following this thread, if you force the valve open, when the Motronic expects the exhaust valve to be closed, it WILL set off a "check engine" light if it sees this more than a couple times.
     
  9. darrenliu

    darrenliu Formula Junior

    Jun 24, 2008
    450
    Melbourne Australia
    Full Name:
    Darren Liu
    D, for some reason, my car does not have the third ecu or thermocouple for the y-pipe. Either the car was delivered without one (this car is a UK spec. one) or the previous owner removed it. Either way, I have no problems with the CEL. The bypass has been wired open for a long time without any significant problems.
     
  10. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    Perhaps it was only for North American cars??
     
  11. darrenliu

    darrenliu Formula Junior

    Jun 24, 2008
    450
    Melbourne Australia
    Full Name:
    Darren Liu
    This is possible. Even my owners manual shows one ecu behind the rear bumper and one up near the LHS rear shock tower. There's no reference to a 3rd ecu. The next time i'm at a Ferrari club day, I will check other 'australian delivered' cars.
     

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