O2 sensor??
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O2 sensor??

  1. #1

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    Default O2 sensor??

    Well were to start - I have the task of getting my bosses 454 supra boat running correctly after we installed a commander 950 fuel injection kit on it. I am an automotive service manager and one of the service advisors talked him into installing this. Now I get the pleasure of getting it tuned in correctly.
    I was wondering if anyone has advice on how I can get an O2 sensor hooked up to the wet exauhst sytem? Is there anywhere I can find exhaust that is made to work in this condition?

    Any advice or help would be great

    Thanks

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    Resident Ford Nut Sleeper CP's Avatar
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    Start here:

    http://www.performanceboats.com//showthread.php?t=8773

    When you say "wet" what type of exhaust is it ?

    If there is water in the system that can get to the sensor even by reversion the O2 sensor will not work.

    Good luck.

    Sleeper CP

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    Ummmm what type of exhaust? Thats a good question I guess I'll try and find out - not a boat person here. That is why I was posting I was hoping someone could help me in that department - give me a suggestion as to some type of modification so I could use and O2 sensor in it to make the tune process easier.

    It is a 1989 Supra inboard 454 high performance and I'm not sure where the water comes into the exhuast.

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    Try taking a picutre and posting it in this thread, lots of folks will know what it is then.
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    You need to identify where the water is dumped into the exhaust flow and make sure your O2 sensor is well in front of that point.

    A spacer between the manifold and the snail with the sensor installed in it would work good. Put the sensor in the top of the spacer.
    A baffle installed just past the sensor so that any water couldn't possibly reach the sensor would be a good idea too.
    I've been told that only the tip of the sensor needs to be in the exhaust flow.
    Most protrude 1/2" + into the pipe.

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    I have EMI exh. I had EMI install the O2 sensor bung here.
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    Default O2 sensor

    Pardon my ignorance, I looked at the EMI website and your photos and I can't figure out how the water keeps from falling back into the motor if it ever quits running. It just seemslike the water ought to go into the pipe on the downside of the riser curve. There's lots I don't get about these watercooled exhausts that I need to learn before I replace mine.

    The o2 sensor seems to close to the water too. LOL it'simportant to realize I don't know what I'm talking about but want to know.

    I'd love to be able to tune my carb with an o2 setup.

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    Quote Originally Posted by TollyWally View Post
    Pardon my ignorance, I looked at the EMI website and your photos and I can't figure out how the water keeps from falling back into the motor if it ever quits running. It just seemslike the water ought to go into the pipe on the downside of the riser curve. There's lots I don't get about these watercooled exhausts that I need to learn before I replace mine.

    The o2 sensor seems to close to the water too. LOL it'simportant to realize I don't know what I'm talking about but want to know.

    I'd love to be able to tune my carb with an o2 setup.
    the picture above shows the O2 bung going thru the jacketed
    (water) part into the exhaust flow. the water and exhaust
    mix down further down stream. think of two pipes one inside the other.

    tfaraca if you will post a pic we can lead you the right direction.

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    Outlaw,
    If I understand you correctly there is another pipe inside the riser that is connected to the hose penetration right above the flange. This little pipe presumably extends over the top of the riser. Why is this better than having the penetration further downstream? If ignorance was bliss I'd be damn happy!

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    21 Daytona Outlaw's Avatar
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    the little pipe fills the space between the two with water. to cool the riser.
    let me find a diagram to post.

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    Hey Thanks guys, you just gave me an idea to pull 02 readings from all cyclinders and keep it out of a water invironment that will make the computer go nuts. pulling from one cyclinder means the computer is tuning one cyclinder only, If they all run perfectly equal then all is well. Anyone that good on tuning gets a harump. Will sell invention!!!! ANYONE???? M

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    Outlaw,
    I think I get it now, a diagram would be great. I am kind of a picture guy! I appreciate your input.

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    Quote Originally Posted by TollyWally View Post
    Outlaw,
    I think I get it now, a diagram would be great. I am kind of a picture guy! I appreciate your input.
    Okay this will really suck because somebody is going to get rich off of an idea that is so basic. Off an exaust gasket build a set of 8 plates and insert before the manifold. Add tubes that will swirl the exhaust out of the manifold thru a set of tubes. (much like the old injector tubes for EGR ) Then plumb back into the exhaust after the riser. You will get readings before the water effects the atmosphere pressure,air density and correctd altitude. Then the computer will tune all the kids and tune more effiencently for better performance and feul economy. MMMM

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    Quote Originally Posted by tfaraca View Post
    Ummmm what type of exhaust? Thats a good question I guess I'll try and find out - not a boat person here. That is why I was posting I was hoping someone could help me in that department - give me a suggestion as to some type of modification so I could use and O2 sensor in it to make the tune process easier.

    It is a 1989 Supra inboard 454 high performance and I'm not sure where the water comes into the exhuast.
    An inboard will have water cooled exhaust manifold system. These will have manifold (part bolted to engine), riser (part bolted to the manifold that makes the turn to back of boat).

    Get the gaskets for in between the exhaust manifold and risers. Get two of these. Make a thick enough 'spacer' (I believe 1" will do it, but check/calculate) copying the gaskets exactly (make sure to include water transfer holes if any) out of aluminum or steel and make a threaded hole that lets you screw in a wideband 02 into the exhaust stream.

    Here's a different manifold and riser than you have but it will give you the idea.

    Dana's manifold and riser


    Dana's manifold (riser is removed for photo)


    Dana's 02 sensor plate that goes between riser and manifold - note it matches their manifold/riser.


    Now, most OE manifold / riser systems transfer water to each other internally (ie: thru holes in gasket / manifolds/risers) you must make sure to transfer these in same size and location of course in your spacer.

    The pics you see above are of a typical afltmkt system that transfers water from one part to the other (manifold to riser) thru an external 'jumper' hose and thus no internal water transfer holes (manifold/gasket/riser) like most OE's.

    Hope this helps for a clearer picture.

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