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Old 08-18-2011, 12:49 AM   #1
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VIAIR Xtreme Duty OBA System Install

So I just finished up installing a VIAIR Xtreme Duty on board air system. As soon as I began to install this kit I ran into the problem of where to mount the 2 compressors that make this a 100% duty cycle system. After some carful thought I decided to fabricate up a mounting plate that would bolt to the tub and frame under the battery tray. This allowed me to keep the compressors out of the elements and use the braided stainless steel air lines that came out of the compressors. I decided to mount the 2 gallon air tank in the engine bay on the passenger wheel well with the help of a couple of fabricated brackets to help with the contour of the fender. I plumed in a safety relief valve, air pressure gauge line (into the cab), a air pressure relay for the compressors and a air pressure regulator (to allow the use of air tools at 90psi). I then plumed in a future auxiliary port that will be used for a future air locker, and air lines running to the front and rear bumpers on the passenger side. Both ending with quick air connectors and a couple of ace hardwares plastic chair foot caps to protect them from the elements.
The air pressure gauge that came with the kit is a integrated gauge & on/off switch plate but it just didn't keep the clean look and feel of my dash so I found a backlit air pressure gauge made by VDO that is almost identical to the gauges in the factory cluster. I replaced my Dana 30 years ago with a Hi Pinion Dana 44 so my factory 4WD indicator no longer worked and drew the short straw for replacement. I took my time and cut/ drilled out the space and installed the new gauge in it's place. With the gauge cluster cover on it's almost perfect. As for the on/off switch I used a previously installed toggle switch that I had installed for future projects.
The electrical on this project is pretty straight forward with 2 relays, On/ off and a power and ground.

Overall I couldn't be happier with the systems performance. I have 37" IROK's that I run around 10 - 8psi on the trail and 20 - 18psi on the street. This system fills each tire in right round a minute. The air tank allows me to use my impact wrench and ratchet driver but I wouldn't want to use it for anything other than trail repairs. I have even filled up wife's pool floaties.
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Old 08-18-2011, 12:50 AM   #2
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Wow! Some of those pics posted way too dark, I'll try and put up some better ones tomorrow.

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Old 08-18-2011, 05:29 AM   #3
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I like that system how much did you pay for it and where did you buy it?
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Old 08-18-2011, 07:39 AM   #4
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Very nice. OBA is definitely on my "to do" list for the YJ.
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Old 08-18-2011, 08:55 AM   #5
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Great idea on your mounting location. We've been selling a LOT of the Viair stuff lately with some special pricing I've been giving forum members and they have a great product. I've got the heavy duty system myself that I've been procrastinating on installing.

In addition to being able to use the air tank for air tools, another important advantage of an on board Viair kit versus just using a plug in compressor is the ability to reset your bead if you lose one out on the trail. Most portable compressors just simply don't have the output to set the bead if you lose a tire out on the trail.

So, did you find a plate pre-bent like that and just cut and drilled to fit or did you bend some flat stock and go from there? EDIT: Nevermind, I see you welded the angle mount for going on the firewall. I may have to steal that idea for myself.
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Old 08-18-2011, 12:03 PM   #6
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I just finished putting 2 viar 380c compressors under each of the front seats. Viar sells a nice mount and they fit *flush* underneath. This photo is an steal view of the pass seat removed. (the on board air system supplies (2) 3gal air tanks for Hadley horns and other toys) I was trying to avoid losing valuable under-the-hood space

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Old 08-18-2011, 01:28 PM   #7
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looks nice, i HIGHLY recomend getting some rubber covers to go over the connectors on the outside, otherwise you'll be scrambling to get the mud out from inside them....and you def don't want dirt getting into your air tools....

giving me some idea's for the OBA that i wanna do to my jeep.
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Old 08-18-2011, 01:40 PM   #8
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Quote:
Originally Posted by draarong2004
looks nice, i HIGHLY recomend getting some rubber covers to go over the connectors on the outside, otherwise you'll be scrambling to get the mud out from inside them....and you def don't want dirt getting into your air tools....

giving me some idea's for the OBA that i wanna do to my jeep.
"Both ending with quick air connectors and a couple of ace hardwares plastic chair foot caps to protect them from the elements."

Already a step ahead of ya!
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Old 08-18-2011, 09:20 PM   #9
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Quote:
Originally Posted by NW_YJ

"Both ending with quick air connectors and a couple of ace hardwares plastic chair foot caps to protect them from the elements."

Already a step ahead of ya!
lol i was hopin so....didnt see em in the pics, and again, nice fabricating
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Old 09-06-2011, 04:47 PM   #10
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Finally got a chance to get som better photos.

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VDO gauge in dash.

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Air pressure regulator.

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Lines in from compressors.

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Intake filters for compressors.

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Compressors mounted under battery.

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Air tank mounts, relays, fuse.

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