Need help with O2 sensor placement
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Need help with O2 sensor placement

  1. #1
    Member NY CVX-20's Avatar
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    Default Need help with O2 sensor placement

    Hello –I need some help with where to place an O2 sensor (if what I want to do is even possible). I’m converting a Banks turbo kit to a blow thru deal and the engine will be used in a closed engine compartment, so basically I’m stuck using the water jacketed exhaust system. My only thought was to possibly remove some material from the flange in the pic below and install the sensor here (assuming I have room to do so). But this would put the sensor only a few inches away from the turbo. Is that too close for the sensor to work properly?

    I talked to my engine builder and he didn’t think there would be a problem doing it this way. Then I talked to the guys at FiTech (I was thinking about using their kit) and they said that it wouldn’t work and that the sensor should be at least 12” away from the turbo due to extreme heat and pressure. So now I have conflicting advice and I do not know what to do. Regardless if I run the FiTech EFI kit or go with a carb, at the end of the day I want to have a working O2 sensor for peace of mind that my setup is tuned correctly. Now I just need a way to pull this off. What do you guys think?
    Thanks, Tony
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    1979 Glastron Carlson CVX-20, 460 jet w/diverter

    1972 Glastron Carlson CV-21, Twin Turbo 509 ( http://www.classicglastron.com/phpbb...hp?f=34&t=5596 )

    http://www.youtube.com/user/stanger311

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  3. #2
    Member NY CVX-20's Avatar
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    This is not my engine but this is the same exhaust system I'm working with-
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    1979 Glastron Carlson CVX-20, 460 jet w/diverter

    1972 Glastron Carlson CV-21, Twin Turbo 509 ( http://www.classicglastron.com/phpbb...hp?f=34&t=5596 )

    http://www.youtube.com/user/stanger311

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    Or Seth, either one Budweiser's Avatar
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    I think your bigger concern might be it's placement and how close it is to where the water is introduced into the exhaust stream. Water will kill it quicker than heat. You may have to come up with an exhaust solution that introduces water closer to, or at the transom.

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    Member NY CVX-20's Avatar
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    Thanks for the reply. With these Banks exhaust outlets, the water isn't introduced until just before the rubber hose connects at the end. Assuming I could tap into the flange before the 90* bend, that would give me approx 8-10" + the 90* bend before water is introduced into the system. Is that still not enough?
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    1979 Glastron Carlson CVX-20, 460 jet w/diverter

    1972 Glastron Carlson CV-21, Twin Turbo 509 ( http://www.classicglastron.com/phpbb...hp?f=34&t=5596 )

    http://www.youtube.com/user/stanger311

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    Or Seth, either one Budweiser's Avatar
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    Looking at the pics, it seems too close for comfort. You may get a different opinion, but my guess is the consensus will be that it's too close.

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    I'm up for any suggestions that can make this work. What if I had someone fabricate a spacer between the turbo and the exhaust elbow to give me more distance between the sensor and the water? Maybe a spacer before the turbo? IDK.. I'm feeling kind of F'd right now and I'm not sure what to do.

    -If I can rant for a minute about my current situation.. there are only two shops in my area with dynos.. and neither one of them will dyno tune my engine with the turbos so basically I'm on my own to tune this thing -and I've never done it before. I've spent the last 4 years buying parts, having the engine built and buying the turbo parts and the last thing I want to do is break the damn thing because it wasn't tuned right. I just got off the phone with the 2nd dyno shop and they said I'm not touching an engine like that. I don't get it... so frustrating.

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    Can you do it at the inlet to the turbo? Maybe make a short spool piece to go between the turbos and the exhaust manifolds?

    I have NO turbo experience, but the AEM wide-band sensor set-up has proven to be very reliable for my N.A. junk. And it's not that expensive either.

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    Wont work at turbo inlet. i believe Brad at E-ticket has his there and it doesnt function completely. 3 or 4 inches after the turbo outlet and make sure there is plenty of pipe after the sensor
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


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    Quote Originally Posted by Infomaniac View Post
    Wont work at turbo inlet. i believe Brad at E-ticket has his there and it doesnt function completely. 3 or 4 inches after the turbo outlet and make sure there is plenty of pipe after the sensor
    Thanks for the reply -How much pipe are we talking between the sensor and where water is introduced? It appears that the gale banks exhaust isn't going to work with an o2 sensor. I might have to scrap the turbo idea until I can figure something else out. I don't want to run boost without know my A/F ratio and I need an exhaust that will stay cool under a hatch.


    For the sake of argument -when the engine is running the exhaust is forcing the water out and when the engine stops so does the water flow. I don't see how the water will ever get back to the sensor?! Am I missing something?
    1979 Glastron Carlson CVX-20, 460 jet w/diverter

    1972 Glastron Carlson CV-21, Twin Turbo 509 ( http://www.classicglastron.com/phpbb...hp?f=34&t=5596 )

    http://www.youtube.com/user/stanger311

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    I would build jacketed exhaust pipe no water in the exhaust stream. And always mount the sensor a few degrees from the bottom so moisture doesnt sit on the sensor when not running. it will collect a lot of moisture from the air.

    Most dyno shops just run the engine and you bring your own tuner. They can't take responsibility for an engine failure
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  13. #11
    Member NY CVX-20's Avatar
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    Quote Originally Posted by Infomaniac View Post
    I would build jacketed exhaust pipe no water in the exhaust stream. And always mount the sensor a few degrees from the bottom so moisture doesnt sit on the sensor when not running. it will collect a lot of moisture from the air.

    Most dyno shops just run the engine and you bring your own tuner. They can't take responsibility for an engine failure

    Unfortunately that is not something I can build on my own. Are there any companies that can make custom water jacketed pipes?
    1979 Glastron Carlson CVX-20, 460 jet w/diverter

    1972 Glastron Carlson CV-21, Twin Turbo 509 ( http://www.classicglastron.com/phpbb...hp?f=34&t=5596 )

    http://www.youtube.com/user/stanger311

  14. #12
    LP-25.com Infomaniac's Avatar
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    Borla or pay a visit to a good muffler shop
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  15. #13
    Member NY CVX-20's Avatar
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    If I can find something like the set in the middle of this pic, I wonder if that will work.. Then just use a small piece of rubber hose to connect to the exhaust tip.

    1979 Glastron Carlson CVX-20, 460 jet w/diverter

    1972 Glastron Carlson CV-21, Twin Turbo 509 ( http://www.classicglastron.com/phpbb...hp?f=34&t=5596 )

    http://www.youtube.com/user/stanger311

  16. #14
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    Quote Originally Posted by NY CVX-20 View Post
    This is not my engine but this is the same exhaust system I'm working with-
    Is water being injected outta those watercooled turbo dump elbows?

    Dare to be different, if it turns out great you can claim you planned it that way.

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