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    Smart dash wheel speed sensor

    I'm working on getting a wheel speed signal to my RT Dash2 (no DL1). Anybody done something similar?

    Diff sensor: mine has no continuity...ever. So, either the sensor is bad, or my custom diff is missing the trigger wheel.
    -Sensor has two wires, so this means I'm dealing with a VR sensor right?

    I'm trying to decide on my options here.

    Would you?
    -Try to figure out what's wrong with the existing sensor and wire it up using a signal conditioner (like $140 from RT...ouch!)
    -Wire a hall sensor up to the driveshaft. If so, where would you mount it? Would a generic sensor be any less effective than the $60 RT one?
    -Chris

    #2
    id just get a gps speedo

    Turbo M42 Build Thread :Here
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    I like the tuna here.
    Originally posted by lambo
    Buttchug. The official poster child of r3v.

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      #3
      if anything hit up a junkyard around you and pick up another sensor and try that. also if you know someone with a OE diff. measure the spacing of the trigger wheel to make sure you didn't move yours out of range.

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        #4
        Grab a mirror, pull the sensor, LOOK FOR TRIGGER WHEEL?

        Ich gehöre nicht zur Baader-Meinhof Gruppe

        Originally posted by Top Gear
        Just imagine waking up and remembering you're Mexican.

        Every time you buy a car with DSC/ESC, Jesus kills a baby seal. With a kitten.


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          #5
          Originally posted by Dj Buttchug View Post
          id just get a gps speedo
          I'd love to, but my finances won't yet permit that. DL1,yes please ;)
          Just trying to make my car street legal at this point.
          -Chris

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            #6
            Originally posted by Invisible Saddle View Post
            if anything hit up a junkyard around you and pick up another sensor and try that. also if you know someone with a OE diff. measure the spacing of the trigger wheel to make sure you didn't move yours out of range.
            Good call, but would it be even be worth the effort if it's a VR sensor? Since the signal needs to be conditioned. Short of the mounting challenges, it seems like a hall sensor might be more appropriate. Maybe more accurate? I have no idea.
            -Chris

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              #7
              Originally posted by u3b3rg33k View Post
              Grab a mirror, pull the sensor, LOOK FOR TRIGGER WHEEL?
              Will do. For some reason I figured I wouldn't be able to see it.

              So have any of you actually made the diff sensor work with a smart dash? All this wiring stuff gets a little crazy. Does anyone have a specific example of how they wired this up?
              -Chris

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                #8
                Pretty sure the diff sensor is just a switch (aka hall sensor).

                also:http://www.unofficialbmw.com/speedo/speedo_d.html

                Ich gehöre nicht zur Baader-Meinhof Gruppe

                Originally posted by Top Gear
                Just imagine waking up and remembering you're Mexican.

                Every time you buy a car with DSC/ESC, Jesus kills a baby seal. With a kitten.


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                  #9
                  Well I connected a different speed sensor. It had continuity and looked good. So, I attempted to wire it to the dash. Messed something up (no idea what) and fried it. So, now I'm way back behind square one. This thread to be continued once I make the dash work again....hopefully.
                  -Chris

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                    #10
                    Uhoh, I hope you get it fixed. Seems to me you're using the same dash that I have my eyes on too...
                    Last edited by Justin B; 03-14-2011, 12:23 PM.

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