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Viair Automatic Mod (VAM)

Discussion in '3rd Gen. Tacomas (2016+)' started by tonered, Aug 13, 2020.

  1. Aug 13, 2020 at 7:18 AM
    #1
    tonered

    tonered [OP] tacorider

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    Hey, Folks.

    I got a Viair 300P because it seemed to be the sweet spot between price and rated CFMs. The CFMs certainly did not disappoint after several uses, but the non-automatic part is slightly problematic, esp when doing air checks on all of the family vehicles.

    I found some breadcrumbs for an easy mod using a relay and an air horn compressor pressure switch.

    Parts are arriving today. So, this should be good to go this weekend.

    From the posts around here, I know there are a ton of folks with Viairs. This might be handy?

    https://www.tacomaworld.com/threads...ild-and-bs-thread.636594/page-4#post-23970721


    Another Viair mod:

    The male outlet bothers me. I like female couplers on the tool end. The problem is that the Viair coupler uses straight threads that appear to be M14x1.0. That is the top fitting in the pic below. The bottom one is a standard NPT fitting.
    upload_2020-12-7_9-25-27.jpg

    If folks go this route, you should check first. The Viair folks said that the thread was 1/4 NPT and was changed to M14x1.0.

    I just found this adapter to try out:
    https://www.fittings.space/gbm22-04zf-m14x10mc
    upload_2020-12-7_9-27-12.jpg

    It twerkes!

    PXL_20201215_001714325.jpg
     
    Last edited: Dec 15, 2020
    C41n, Biscuits, Landpirate and 3 others like this.
  2. Aug 13, 2020 at 7:18 AM
    #2
    tonered

    tonered [OP] tacorider

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    Viair Automatic Mod (VAM)

    Here's the mod details:

    The Viair uses metric fasteners. Nice!

    The wiring appears to be 12 AWG. I was able to get it into the 14 - 16 blue terminals.

    Schematic:
    Apologies for the D- handwriting. See the Upskirt pic below for the matching harness numbers.
    schematic - numbered.jpg

    Here's the mechanical side:

    I reamed the tee fitting, linked below, from 1/8in dia to 3/16in dia since it is not used just for sensing, but for flow also.

    Reamed Tee:


    Ready to go:



    I just enjoy making wire clamps. Of course oetiker or worm drive would be just as good.
    IMG_20200815_111532.jpg

    General layout:
    IMG_20200815_111605.jpg

    I drilled a few holes in the foot plate for zip ties:
    IMG_20200815_113227.jpg
    IMG_20200815_113220.jpg

    I used a slightly longer screw and a washer to mount the relay.


    The electrical side:

    I can choose to use the pressure switch when doing airchecks, or use it in non-automatic mode if I need to.

    Deployed:
    IMG_20200815_150317.jpg

    Stored:
    IMG_20200815_150328.jpg


    Upskirt:
    After this pic, I hit the terminal ends with heat to shrink these killer marine terminals.
    IMG_20200815_150335.jpg


    Lemme know if you got any questions or comments.



    Source info:

    Here's what I am working with for the automatic switch:
    http://www.rpod-owners.com/forum_posts.asp?TID=7865

    I found a ton of switches on Amazon including a Viair version:
    https://www.amazon.com/Pressure-Switch-90-120-Compressor-120PSI/dp/B07XZ1FKYN

    https://www.amazon.com/VIAIR-90111-Pressure-Switch-Relay/dp/B000FQ793A

    Pressure switch tee fitting:
    https://www.amazon.com/gp/product/B00EOT94QO

    Pics from the Rpod link:


     
    Last edited: Aug 20, 2020
    Biscuits, Landpirate, jmneill and 3 others like this.
  3. Aug 13, 2020 at 7:20 AM
    #3
    Freegolf

    Freegolf Well-Known Member

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    Nice. Will be following closely as I have the same compressor :thumbsup:
     
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  4. Aug 13, 2020 at 7:23 AM
    #4
    tonered

    tonered [OP] tacorider

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    Thanks!

    I will take some pics in the middle for this one, not just at the end. :rofl:
     
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  5. Aug 13, 2020 at 7:30 AM
    #5
    LstMinutePanic

    LstMinutePanic Well-Known Member

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    tonered [OP] likes this.
  6. Aug 13, 2020 at 7:32 AM
    #6
    tonered

    tonered [OP] tacorider

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  7. Aug 14, 2020 at 8:40 AM
    #7
    tonered

    tonered [OP] tacorider

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    The parts came. The existing guts were slightly different than expected, so I am planning this out. They soldered the spade terminals to the switch. I am not going to undo that good connection.

    The tee for the pressure switch only had 1/8in dia holes in the barbed ends. I reamed thouse out to 3/16in.

    I also tried to swap the male outlet hose connection on the pump to a more typical female connector. Unfortunately, the stock fitting is fine pitch, straight threads. Not 1/4 NPT. Interesting.


    Reamed Tee:
    upload_2020-8-14_8-38-28.jpg

    Ready to go:
    upload_2020-8-14_8-38-52.jpg

    It looks like an external only mod:
    IMG_20200813_173246.jpg
     
  8. Aug 15, 2020 at 3:25 PM
    #8
    tonered

    tonered [OP] tacorider

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    It works!

    IMG_20200815_150317.jpg

    I'll post up more pics, details, and a schematic.
     
    ohcjam, dilbert, Shellshock and 2 others like this.
  9. Aug 15, 2020 at 4:13 PM
    #9
    Shellshock

    Shellshock King Shit of Turd Island

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    You are a crafty fella! :thumbsup:
     
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  10. Aug 15, 2020 at 4:29 PM
    #10
    tonered

    tonered [OP] tacorider

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    Thanks, @Shellshock !

    The angry pixies didn't get me.
     
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  11. Aug 15, 2020 at 5:13 PM
    #11
    tonered

    tonered [OP] tacorider

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    @dilbert

    Those crimpers that you recommended were top notch. They were a joy to use after only frustration or hand soldering terminals in the past.
     
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  12. Aug 15, 2020 at 6:22 PM
    #12
    dilbert

    dilbert Well-Known Member

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    The ratcheting ones? I love those things, they make a really solid connection.
     
    davidstacoma and tonered [OP] like this.
  13. Aug 15, 2020 at 6:39 PM
    #13
    tonered

    tonered [OP] tacorider

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    Yessir. I finally bought the ones that you recommended.

    The marine heat shrinks were kicking also.
     
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  14. Aug 15, 2020 at 7:06 PM
    #14
    dilbert

    dilbert Well-Known Member

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    Awesome! Between replacing broken sprinkler valves and now replacing damaged underlayment, the flooring, and a toilet in the kids bathroom - I haven't had much time for fun projects.
     
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  15. Aug 15, 2020 at 7:10 PM
    #15
    tonered

    tonered [OP] tacorider

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    Not good.

    I've been putting off shower repair for way too long. We also need to get on some not fun painting.

    I'll take the Taco projects.
     
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  16. Aug 15, 2020 at 7:18 PM
    #16
    mutely

    mutely Well-Known Member

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    Since you don’t have a tank, I’m having a hard time understanding what the pressure switch is for. I don’t think placed their it’ll give you an accurate (Or even close) reading of tire pressure until the compressor is off.
     
  17. Aug 15, 2020 at 7:19 PM
    #17
    dilbert

    dilbert Well-Known Member

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    I love that wire hose clamp tool. The connections look so nice. It's on the top of my Amazon wishlist. Then I need to do this mod.
     
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  18. Aug 15, 2020 at 7:22 PM
    #18
    dilbert

    dilbert Well-Known Member

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    It turns it on and off automatically when you connect and disconnect from the tires.
     
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  19. Aug 15, 2020 at 7:22 PM
    #19
    tonered

    tonered [OP] tacorider

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    :hattip:

    It takes longer and is more complicated, but I just enjoy it. The simple, low profile clamps from anything just get me going.
     
  20. Aug 15, 2020 at 7:25 PM
    #20
    tonered

    tonered [OP] tacorider

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    Accurate readings and not racing between the pump and the 14 tires that we have for regular checks.

    Note that I am using @Shellshock 's deflator / inflator with a digital gauge. The one that came with the 300P is not at nice for a few reasons.
     
    Last edited: Aug 15, 2020
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