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OBA -> On Board Air Mega Thread & BS

Discussion in 'Technical Chat' started by MJonaGS32, Oct 20, 2013.

  1. Dec 6, 2018 at 10:29 AM
    #1741
    Captbrad88

    Captbrad88 Well-Known Member

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    Just finished up my OBA. It’s ARB twin compressor mounted on the Slee off-road bracket. Used some 1/4” NPT fittings from a local hardware store. They also has some high temp hose I could cut to length there, so picked up 20’ of that. Got it all plumbed up, put in a 1gallon viair tank, and 2 quickconnects. Overall the system is great, since the twin compressor has a shut off at 100psi I should never reach the full potential of the 150psi tank. So far I’ve used a impact just to see how it performs. After about 4 lugs the compressor kicked on but pressure was good to get the last two. It takes about 2 minutes to reach the 100psi for the compressor to kick off from empty system.

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    E02CA84A-1E67-4C1B-A6FA-7BF2FC9F3656.jpg
     
  2. Dec 6, 2018 at 7:32 PM
    #1742
    YamaDirtrider

    YamaDirtrider 1 Down, 5 Up

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    The twin has an internal pressure switch of 150psi
     
  3. Dec 6, 2018 at 8:50 PM
    #1743
    bagleboy

    bagleboy Well-Known Member

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    up to you but a copper wire back to the battery is the best conducting and most fool proof. No worries about rust inhibiting conductivity. Yes the frame is all grounded but do you really want to run 40A through all the bolt/rivet connections?
     
  4. Dec 6, 2018 at 10:19 PM
    #1744
    Captbrad88

    Captbrad88 Well-Known Member

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    That’s good to know, the guy at 4wheel parts told me 100. Thank you for the knowledge.
     
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  5. Dec 6, 2018 at 10:41 PM
    #1745
    anthony250f

    anthony250f Well-Known Member

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    I just didnt want to have to deal with running two 6g wires somehow in the cab. i agree though that it is the best way.
     
  6. Dec 7, 2018 at 5:51 AM
    #1746
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    People ground Amps to sheet metal all day long. For your air compressor that would be just fine. Your 6ga is a bit overkill anyways, compare your wire to the 2 wires that come with the ARB twin at something like 15ft long.
     
  7. Dec 7, 2018 at 5:55 AM
    #1747
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Always look at the manufacturers spec sheet and don't believe a word a retailer says.. Especially 4whpts
     
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  8. Dec 7, 2018 at 6:28 AM
    #1748
    anthony250f

    anthony250f Well-Known Member

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    Yeah according to all the amp charts I am seeing 6g was the way to go. I don’t understand how arb gets away with what looks like 10g wire
     
  9. Dec 7, 2018 at 6:32 AM
    #1749
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    It's 2 of them, so essentially it's like 5ga wire. The ARB "Twin" compressor is just 2 of the singles bolted together
     
  10. Dec 7, 2018 at 2:51 PM
    #1750
    Digiratus

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    The ARB twin compressor comes with 8 ga power wires in their install kit. One set for each compressor in the twin setup. ARB recommends connecting directly to the battery. So you end up with two connections at the battery for each compressor, a total of 4-8 ga wires to the battery.
     
  11. Dec 7, 2018 at 9:27 PM
    #1751
    moser633

    moser633 2016 TRD OR AC

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    i just bought a arb single and was wondering do i need the pressure switch if im using it just for airing up tires?
     
  12. Dec 7, 2018 at 11:07 PM
    #1752
    bagleboy

    bagleboy Well-Known Member

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    Nope.
     
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  13. Dec 7, 2018 at 11:31 PM
    #1753
    Red18Taco707

    Red18Taco707 Well-Known Member

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    :notsure: I did. Also thinking about adding the remote hoses at the front and rear.
     
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  14. Dec 7, 2018 at 11:33 PM
    #1754
    bagleboy

    bagleboy Well-Known Member

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    My heavier wires pass through the grommets under the seats. In under the driver's seat to the relay and out to the compressor under the passenger seat. Ground wire runs along the passenger frame rail up into the engine bay across and around to the battery. Since I brought air into the cab I installed the pressure switch and relay there under the console along with a 6-way mini fuse box that I'm converting to 2x3-way so I can have both always hot and ignition hot fuses there. One nice thing about the 5-manny is that there's a perfect spot below the cup holders and after sanding the clips it pops out as easily as the dash fuse cover cubby.
     
  15. Dec 8, 2018 at 1:39 PM
    #1755
    moser633

    moser633 2016 TRD OR AC

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    installed me arb single just need to order my switch to fit in my dash but runs and fills up my tires in about 2 minutes.
    IMG_1587.jpg

    IMG_1588.jpg
     

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