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    Wideband/Pyrometer Sensor Positions

    Hey guys, I have a question about how to position a Wideband and Pyrometer probe in my exhaust. I'm building a new dp for the car and I've seen 2 different types of bungs to install the sensors. The first one will put the sensor at 90 degrees to the direction of exhaust flow, and the other puts it at 45 degrees. I have a sweet picture to show you what I mean.



    I am planning on going with the 45 degree bung, as I will only be using 2.5" pipe, and I figure the 45 degree ones will help with keeping the exhaust flow up.(Slightly, I know, but every bit helps). I just basically want to know if the 45 degree orientation will affect things badly in any way? Like will the sensors not read properly is my main concern?

    Thanks guys.
    Tyler has spoken

    #2
    i'm running a straight bung.

    i doubt you will see any positive or negative effect regardless of which one you choose.
    Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
    ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
    Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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      #3
      2 minutes for you to respond. You are on top of the game.

      Is there a set distance that you have to put the wideband sensor or an EGT sensor away from the turbo outlet?
      Tyler has spoken

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        #4
        for EGT in the downpipe you want as close to the turbine as possible. mouting it in one of the exhaust manifold runners is actually best if you can bear to drill and tap your manifold.

        i think the general rule is 18" of piping away from the turbine for a wideband. mine is mounted right below the turbo, idk exactly how many inches away it is but it seems to work just fine still after 13k miles.

        Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
        ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
        Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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          #5
          Hmm, I'm not sure I would want to drill and tap my manifold. I think I'll mount the EGT sensor just after the stock dump pipe, and the wideband 18-ish inches from the turbine outlet.

          Thanks for the lightning fast replies.
          Tyler has spoken

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            #6
            i'd drill and tap the stock dump pipe for the EGT at least.... you want it seriously as close to the turbine as possible.
            Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
            ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
            Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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              #7
              EGT should be in the manifold if at all possible...thats where you'll see peak temps. Downpipe won't give you the info you want.
              1991 Capri XR2 "GTXR2" BPT AWD Bastardization/conversion
              1991 Isuzu Impulse RS Turbo AWD

              Creator of the B6T Rocketchip
              www.werbatfik.com

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                #8
                Yo! Tyler Koleslaw! Whaazaap?

                He's right. Drill and Tap the manifold and put the egt probe in one of the runners. It's not that scary. If you want to close it up later, you can screw in a stainless plug.

                A EGT that far away from the exhaust valve isn't going to tell you what you need to know.

                p.s. I sent you a new money order today in the mail.

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                  #9
                  If you're going to drill the manifold, only use the EGT while tuning. They tend to break and where do they go? Into the turbo and **** it up. Pull out the EGT probe once you are finished tuning and cap it off with a bung cap.
                  I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

                  ._________________________
                  |.....Overnight....................| ||
                  |.....Japan Parts.................| |'|";,___.
                  |_..._...____________======||_|_|...,]
                  "(@)'(@)""'''''''''''''"'''"**|(@)(@)*****"(@)
                  Oh and by the way that shot in your banner with Vin Diesel's car getting shot, thats a civic not an altezza.

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                    #10
                    Lambda sensors operate at a fixed temperature rate to provide accurate readings.Too cold and readings are way off, too hot and the sensor gets damaged.
                    In order to reach the operating temp, they have heating elements.
                    But if you place them near turbo, they obviously overheat and fail.
                    That's why the recommended place to put them is further down the exhaust stream , usually before the catalytic converter.
                    You can also build a heatsink for the sensor itself to be sure that excess heat goes away.

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                      #11
                      worthwhile read

                      BG Astina + GTR convertion + Microtech ECU + FMIC + 3" Exhaust x 21psi boost = 12.168sec to the power of 326whp

                      Here's My Worklog and My YouTube Videos

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