Welding in Wideband Sensor locations..

Thread in 'Technical Questions' started by mc_bob, Jul 1, 2011.

  1. mc_bob

    mc_bob Active Member

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    I was going to wait for Gav, but im impatient.

    I plan to weld it into the decat pipe, primarily because its mild steel, and easier for me to weld to.

    Im assuming, that being furthur back, wont effect my readings, assuming no exhaust leaks.

    Also, less heat better?

    AND.

    Innovate suggesst between 10 and 2 oclock to avoid moisture setting in there. Thats fine, but what above front to back, is it better to have it tilted towards, away or straight down in the exhaust?

    Thanks!!
     
  2. gaz_moose

    gaz_moose .MTM.

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    some decats have nuts welded in for a lambda sensor.
     
  3. superclarkey

    superclarkey DORITECH MOTORSPORT

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    Thats too far down the exhaust, need to be on the elbow or just below it.. shouldn't be anywhere near the cat.
     
  4. mc_bob

    mc_bob Active Member

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    How comes? I didnt think it needed to be, im interested.

    Theres no nut welded in already.
     
  5. superclarkey

    superclarkey DORITECH MOTORSPORT

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    when the gases are the hottest and less chance of air coming back up the exhaust and confusing the signal.
     
  6. mc_bob

    mc_bob Active Member

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    Oh right, I presumed itd be okay there. Seems not.

    Thanks.
     
  7. mc_bob

    mc_bob Active Member

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    Im not trying to be a knob, just worth noting. AEM say this :

    To ensure long service life, the sensor should be placed at least 36 inches (91 centimeters) away from the turbocharger. The sensor will work if placed closer, but will run hotter, which will decrease the service life of the sensor unit.

    Im going to get under the car tommorow and see what I can do.
     
  8. superclarkey

    superclarkey DORITECH MOTORSPORT

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    why ask if you already know lol..
     
  9. mc_bob

    mc_bob Active Member

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    I only just saw that. Ive not looked on AEMs site, but uses the same Lambda setup.

    Thanks.
     
  10. yogi bear

    yogi bear Active Member

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    the elbow is too hot for a wideband. they WILL break. narrowband is fine in that location but not the likes of a bosch wideband.


    put it about 50cm down the down pipe. it will be fine there.
    if you put them too far away then they run cool and can be inacurate, and can be made worse with any leaks in the exhaust.
    go much closer and they will run too hot and WILL def break!
     
  11. superclarkey

    superclarkey DORITECH MOTORSPORT

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    I've never had any problems with it being in the beginning of the front pipe, nor have I know them to break any quicker in that location.
     
  12. yogi bear

    yogi bear Active Member

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    if you put them in the elbow, they do. i can assure you of that. they reccomend the bosch sensors temperature not to exceed 500c. most wideband kit use the bosch sensor.
    i dont know about other brands of sensors however
     
    #12 yogi bear, Jul 2, 2011
    Last edited: Jul 2, 2011
  13. GTS GAV

    GTS GAV Active Member

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    mappers stick the sensor for wideband at the end of the exhaust system for a reason not just for convenience

    bosch recomend having the sensor mounted away from the turbo by atleast 20inch or more for the best readings and also to ensure the life of the sensor itself
     
  14. HermaN

    HermaN Member

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    At the end of the downpipe where it mates with the decat or the decat itself are ideal.
     
  15. superclarkey

    superclarkey DORITECH MOTORSPORT

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    Funny because the good mappers prefer it going in the front of the exhaust if the port is there...I've been asked to put a sensor upfront for when it can be tuned. strange huh.
     
  16. driftescort

    driftescort Active Member

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    Ya I put mine just behind the turbo at about 12 O'Clock on the pipe.
     
  17. GTS GAV

    GTS GAV Active Member

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    some do some dont its just personal preffrence like anything


    i can assure you that my mapper is top knotch, its also the same guy that has mapped bons liner, and also phills s15 in the past, if he ses in the end of the exhaust then end who am i to dissagree :thumbs:
     
  18. al.

    al. actually dom joly

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    decat is fine...won't run too cold, they're heated...and have it at 90deg to the flow

    if you're gonna run it closer to the turbo then get a heatsink boss
     

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