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Thread: WABCO compressor to run ARB diff lock

  1. #1
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    WABCO compressor to run ARB diff lock

    Wanting to do a a refurb of the compressor and came across this video


    Bagpipingandy- How to fit Audi, Jaguar, Mercedes, VW, LR, Wabco air suspension compressor repair kit - YouTube


    The thought struck me, could this be used to run the ARB diff lock? At around 6.30 he states that this produces 16 bar pressure or 220 PSI.

    Why do I think this may be possible, well the other cars that this compressor is used in nearly all run 4 wheel Airbag suspension. Thinking the SLABS runs the solenoids (?) to open on either side when adjustment is required, then, if a four channel solenoid was used, could not one of the extra channels be for the Air Locker switch to control the Locker? Wiring the run of the wabco (which would not pump the closed solenoids of the rear suspension as the slabs would keep these shut) to activate run and activate the 'locker'solenoid.

    https://www.arb.com.au/assets/air-lockers/6-07.pdf

    https://www.amazon.com/Smittybilt-27...8067167f2b9ec3


    Neither of these approach the 220 PSI and reading many articles it talks about the fact that pressure not volume is the best for inflating tyres. hmmm 4 channel solenoid control, 2 for the bags, one for the compressor and one left.....


    PS the refurb of the WABCO is simple, purchased a second hand one for back up and now thinking what a waste, just need a refurb kit and do this regularly like one hour a year and $50

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    This is sort of tangential because I did the opposite of what you are looking to do and installed aftermarket compressors and tank hooked to factory sls, but one thing to consider if you build this is the resistance of the solenoids you use. I believe the slabs unit checks the resistance of the coils in those solenoids as a diagnostic procedure and will throw a code if they don't match the factory value.

    Sounds like a fun project, I have a feeling the factory compressor might let you down in the tire filling department though

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    Second Solenoid

    Quote Originally Posted by DiscoDown View Post
    This is sort of tangential because I did the opposite of what you are looking to do and installed aftermarket compressors and tank hooked to factory sls, but one thing to consider if you build this is the resistance of the solenoids you use. I believe the slabs unit checks the resistance of the coils in those solenoids as a diagnostic procedure and will throw a code if they don't match the factory value.

    Sounds like a fun project, I have a feeling the factory compressor might let you down in the tire filling department though
    Woke up at 4 this morning, I know, WHY, thinking, the tyres may be a bit of pipe dream but the air locker yes and more importantly for the future, one for the back and one for the front in the future if required.


    wabco 2.jpgwabco 21.jpgland-rover-air-suspension-compressor-pump-land-rover-discovery-2-40-l-v8-td5-models-1998-2004.jpg

    The valve block essentially is a set air lines out, one exhaust and electrical connectors to activate each line, sitting in the box (top left corner in the picture). Adding a second block and splitting the air line out of the compressor and attaching the solenoid input to the airlocker switch this to my mind should give me air at more than enough pressure to activate the locker. Would have to find the active line in and make this active as well on the airlocker switch of course. It may require a pressure switch of sorts to allow for leakage out of the lines when the locker is active...

    As this is an adjunct and two separate systems off the same compressor, unless slabs detects compressor operating as a fault, then theoretically this should work and running a second block seems a more logical solution now.

    Does anyone see additional problems
    Attached Images Attached Images

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    A quick diagram might help explain what you are trying to do here. As far as running the compressor, you could simply add a second relay that is parallel to the factory relay in the underhood fuse box and leave the slabs wiring unaltered.

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    Quote Originally Posted by DiscoDown View Post
    A quick diagram might help explain what you are trying to do here. As far as running the compressor, you could simply add a second relay that is parallel to the factory relay in the underhood fuse box and leave the slabs wiring unaltered.

    Not sure that a second relay would be necessary as the Locker switch can use the same line can't it?


    The BIL had a look today at the spare I bought and there is certainly room within for the second solenoid block (or use the ARB solenoid) or use this ARB product which may or may not fit in the box but looks sturdy enough to sit comfortably int he weather so to speak

    ARB 171503 Air Locker Manifold Kit for CKMTA | eBay



    Will try and work out how to do a diagram to put up here and then DO the diagram!


    Thinking something along these lines would also be invaluable as the WABCO it appears runs at 220PSi and the ARB from the information below is only at 70-100

    1-02.pdf3-07.pdf

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    Quote Originally Posted by RRT View Post
    Not sure that a second relay would be necessary as the Locker switch can use the same line can't it?

    1-02.pdf3-07.pdf
    Are you wanting to use the air pressure that is already in your rear bags/lines to engage the locker? Or are you looking to run the compressor on demand to apply air pressure to your lockers? If you want to run the compressor for option 2, you'll want to supply the power for it through a relay.

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    DID NOT THINK OF THAT!!!!

    Quote Originally Posted by DiscoDown View Post
    Are you wanting to use the air pressure that is already in your rear bags/lines to engage the locker? Or are you looking to run the compressor on demand to apply air pressure to your lockers? If you want to run the compressor for option 2, you'll want to supply the power for it through a relay.

    Wow, a line out of the airbag line!! First thought was that is going to be going up and down constantly but then thinking any 'loss' of height is instantly compensated for by the system and, do not think the air volume draw would be too great, is it?

    This is brilliant if it works, no additional reservoir, a single connection (other than the locker of course) and running the line off at just above the diff, even less work!!!

    Do you know of anyone who has done this??? And more importantly was it successful lol

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    Quote Originally Posted by RRT View Post
    Wow, a line out of the airbag line!! First thought was that is going to be going up and down constantly but then thinking any 'loss' of height is instantly compensated for by the system and, do not think the air volume draw would be too great, is it?

    This is brilliant if it works, no additional reservoir, a single connection (other than the locker of course) and running the line off at just above the diff, even less work!!!

    Do you know of anyone who has done this??? And more importantly was it successful lol
    I don't know of anyone who has tried that, I think most people with lockers have probably removed the sls bags. I'm also not sure what pressure the bags run, it may not even be high enough to fully engaged your lockers

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    SLS air pressure

    Quote Originally Posted by DiscoDown View Post
    I don't know of anyone who has tried that, I think most people with lockers have probably removed the sls bags. I'm also not sure what pressure the bags run, it may not even be high enough to fully engaged your lockers
    Found this on the site
    SLS airbag pressure

    so it looks like 70 PSI and as the diff lock would only be used (I guess!) when at off road height they are talking 90 PSI so should have ample pressure to work the diff. The other thing is to put the ARB small tank in off the Airbag line so this way then the wiring is simply to this. At around $100 for the unit still a lot cheaper and easier than fitting a dedicated compressor

    ARB 171503 Air Locker Manifold Kit for CKMTA | eBay

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