Wideband Sensor How?

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by sombreroisland, Aug 12, 2011.

  1. ÖÖ.

    ÖÖ. Ajaa kuin mummo

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    Do you have 2-2 or 2-1 exhaust? Sensors are going to be quite close to cylinders if you put one on each before the 2-1 collector. Maybe too close?
    #21
  2. Dusty

    Dusty Long timer

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    2-2 Arkos

    I put the widebands in the stock bungs, stock location for the 990s.

    Those are the only options for us, lots of others have done it this way and has worked for them.
    #22
  3. Dusty

    Dusty Long timer

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    I was thinking of having extra bungs welded in but.... got lazy.

    The back i was thinking of this spot.
    [​IMG]
    #23
  4. tinwelp

    tinwelp Professional Idiot

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    ÖÖ,
    what Dusty just said, but also consider both of your suggested locations are after joints in the pipework. In my experience there's a big potential for measurement errors unless the sealing at the pipe joints is perfect.

    I mounted sensors in positions close to those used by KTM on the OE pipes when I installed my LM2 on a 950SM.

    If you already have lambda sensors, why not disable them and use the OE mountings? Or if you want to maintain closed-loop operation, some of the wideband kits have the capability of emulating a narrowband sensor which can be used directly by the ECU... and you'll still get your wideband data for logging and export as you wish.

    24" mounting from the exhaust port is not so easy on a bike. I've mounted many much much closer than this with very few problems. Providing there's a reasonable airflow round the sensor to keep it cool, everything should be good.

    Cheers... Paul
    #24
  5. ÖÖ.

    ÖÖ. Ajaa kuin mummo

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    Thanks for all the input. Maybe in the future I could do what you suggested and replace the oem-narrowbands with widebands. That could be one interesting test to do.

    But for now I opted against all recommendations from people smarter than me, as usual. Let's see what happens. Good thing is that only permanent damage is going to be in the 2-1 mid pipe.
    #25
  6. keener

    keener Speed changes you.

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    resurrecting an old thread, to ask a related question.

    Do AFR sensors fit in place of the OEM O2 for 990? Someone told me they don't.

    AFT sensor is M18 but I am not sure what the size of OEM sensor is and if it is possible to use the OEM location with adapter. I am sure Im not the first person trying to do this.

    ?
    #26
  7. Dusty

    Dusty Long timer

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    The ones from the LM-2 bolted right up on my 07-990.
    Save yourself the headache of having to remove half of your bike every time to get to the widebands in the stock bungs and just have new ones welded in a place where you don't have to remove the exhaust. Exhaust comes off once, weld in new bungs replace all the graphite rings and done.
    The LM-2 needs to be recalibrated every so often and they need to be in fresh air... not in the bungs, impossible to do unless you remove the exhaust if left in the stock location.
    This setup allows you to turn the stock 02s on and watch how fast the ECU and 02s work to get to 14.7-1

    [​IMG]

    [​IMG]
    Wideband connectors vip tied to the frame
    [​IMG]
    I taped into the main harness for AFR, Hpa, RPM, TPS.
    [​IMG]
    Data logger on the bag.
    [​IMG]
    #27
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  8. DistortedAxis

    DistortedAxis GO

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    Depending on what AFR measuring tool you plan to use each have different specs for where they say to place the bungs. Mostly how far away from the inlets / outlets from what I am seeing. The specs vary greatly between brands.

    I'm surprised by this. I would have thought KTM engineers would have placed the existing sensors in "the most ideal" location on the 990's.

    Leads me to also wonder how great the variables are between units / brands. If I took 4 units, and placed the bungs in 4x locations (ideal to each unit's instructions / specs) would I end up with identical readings across the unit types?
    #28
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  9. Rharr

    Rharr Been here awhile

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    Anyone know if it is possible to convert the OEM lambda sensor voltage reading into a AFR?

    the android app "ECU sensors" allows you to read pretty much any sensor/input on the bike (EFI) and there are options to show lambda voltage.
    #29
  10. mousitsas

    mousitsas Long timer

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    It does not make sense to convert a narrowband voltage to afr, unless this afr is very close to 14.7
    Anywhere else, the narrowband is inaccurate.
    #30
  11. AB13

    AB13 Long timer

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    Do not put in crossover. 6" from front head would be best case scenario.
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  12. hotrdd

    hotrdd Been here awhile

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    I have a set of the Innovate MTX-L wide band sensors and if I remember correctly for my 05 950 S the O2 sensors that came with the kit were way too big to go into the bungs. I can't remember where I got the smaller ones from but they were BOSCH. The gauges are kind of big I don't think I would be trying to mount them on a bike unless I was having long term problems. Once you are dialed in you should be good to go.
    #32
  13. keener

    keener Speed changes you.

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    Just to confirm, are you saying you found BOSCH wide band sensors that fit in place of the OEM narrowband O2 ?
    #33
  14. mousitsas

    mousitsas Long timer

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    The powerocommander autotune sensors fit on the stock 990 bungs.
    #34
  15. AB13

    AB13 Long timer

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    After taking a die grinder and opening up the hole in pipe.
    #35
  16. mousitsas

    mousitsas Long timer

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    They are a straight fit
    #36
  17. AB13

    AB13 Long timer

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    You must have been lucky.
    #37
  18. Dusty

    Dusty Long timer

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    On some, the factory bungs may not line up with the hole in the pipe, so you may have to grind a bit of that away.
    #38
  19. AB13

    AB13 Long timer

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    This is correct.
    #39
  20. keener

    keener Speed changes you.

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    I am pulling the trigger on this one. I am looking at bungs to have them welded.
    I see I can get stainless, recessed, contoured back and flat, 45 degree,... What do you guys use?
    #40