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I've avoided designing my onboard air system until now, but am having second thoughts about waiting until the interior is more built out. Seems like running wires and air lines might be easier now than when the walls and cabinets are in. My goals are:
-Remotely control the airbags (up or down) from the dash to be able to level the van at campsites, get extra lift when going offroad, maintain airbag pressure for road/load conditions)
-Refill the van tires after airing down for off-road (30/45 PSI to 55/75PSI)
-Blow out dust and sand from the van interior, dry the dog, quick dry things
-Idea is to have a central tank (2.5 - 5 gallons) under the chassis in the rear in front of my spare tire (tons of room on my extended).
-I'll run some quick connect air fittings from the tank to both sides of the van and possibly the rear bumper, and one inside, in order to be able to fill up the van tires, bike tires, and inflatables (tubes, air mattresses, etc).
-I'll have Airlift 5000 Ultimate bags in the rear. Planning on having a manual control for them up in the dash using this: https://www.amazon.com/gp/product/B001F12LZA/ref=ox_sc_saved_title_8?smid=ATVPDKIKX0DER&psc=1
-The air manifold will just hook in to the bags and tank (with pressure regulator).
-Tank will have a pressure switch to turn the compressor on when it gets below a certain value. I'll probably try to wire up an air pressure gauge to the tank itself that is a sending unit to my Victron Cerbo GX so I can check tank pressures. Finally, I'll have an on/off switch for the compressor, either in the dash or in the back, to cut power to the compressors (I won't keep it on or the tanks full most of the time.)
The one piece of the puzzle I'm still trying to figure out is what compressor setup to run. I don't really want the compressor inside the van.
I pretty much want 100% duty cycle.
ARB Twin Compressor (CKMTA12): $600, 4.68 CFM @30PSI, 150 PSI Max, 70A current draw. Only IP55 rated, which is the main problem. I don't really think it's a good idea to mount it under the van. I could try to create a mostly water/splashproof box and use an air intake relocate kit into the interior of the van, but that's a decent amount of effort. I was thinking about trying to mount it in front of the driver side wheel in the bumper (same spot as the windshield fluid reservoir, just opposite side. Should be pretty protected and have good air with the front wheel liners installed. Problem with that is running the power wires for 70A over to CCP2 inside the cab - needs pretty thick wires and that space is already too crowded with my audio install. Running super thick gauge wire to the back passenger side of the van where my house electrical is seems a non-starter.
Viair 485C Compressor: $400, 1.67 CFM @30PSI, 1.36 CFM @80PSI. .
200 PSI Max, 23A current draw, IP67 Rated, 100% Duty cycle at 200 PSI.
Could mount this under the chassis no problem, wiring would be pretty easy and straightforward. But the fill rate seems low? Says 5.25 min to go from 0-30 PSI on a 37" tire, 1.5 min to go from 15-30 PSI. No clue what that means from going from 45-75PSI, but I'd assume it would take slower (6 min a tire?)
www.viaircorp.com
Viair 485C Dual Compressors: $525, 3.05 CFM @30PSI, 2.34 CFM @80PSI.
200 PSI Max, 44A current draw, IP67 Rated, 100% Duty cycle at 200 PSI.
Enough space under the chassis as well. Says 3.75 min to go from 0-30 PSI on a 37" tire, 1.8 min to go from 15-30 PSI.
www.viaircorp.com
Anyways, just trying to figure out what I actually need. Seems like most people have compressors considerably less powerful than these (like Viair 88P, 1.25 CFM at 30PSI, .75 CFM at 80PSI, only 25min Duty cycle at 30 PSI)? Seems like this is not nearly adequate to get the van from air-down pressures back up to Highway pressures? Am I missing something?
-Remotely control the airbags (up or down) from the dash to be able to level the van at campsites, get extra lift when going offroad, maintain airbag pressure for road/load conditions)
-Refill the van tires after airing down for off-road (30/45 PSI to 55/75PSI)
-Blow out dust and sand from the van interior, dry the dog, quick dry things
-Idea is to have a central tank (2.5 - 5 gallons) under the chassis in the rear in front of my spare tire (tons of room on my extended).
-I'll run some quick connect air fittings from the tank to both sides of the van and possibly the rear bumper, and one inside, in order to be able to fill up the van tires, bike tires, and inflatables (tubes, air mattresses, etc).
-I'll have Airlift 5000 Ultimate bags in the rear. Planning on having a manual control for them up in the dash using this: https://www.amazon.com/gp/product/B001F12LZA/ref=ox_sc_saved_title_8?smid=ATVPDKIKX0DER&psc=1
-The air manifold will just hook in to the bags and tank (with pressure regulator).
-Tank will have a pressure switch to turn the compressor on when it gets below a certain value. I'll probably try to wire up an air pressure gauge to the tank itself that is a sending unit to my Victron Cerbo GX so I can check tank pressures. Finally, I'll have an on/off switch for the compressor, either in the dash or in the back, to cut power to the compressors (I won't keep it on or the tanks full most of the time.)
The one piece of the puzzle I'm still trying to figure out is what compressor setup to run. I don't really want the compressor inside the van.
I pretty much want 100% duty cycle.
ARB Twin Compressor (CKMTA12): $600, 4.68 CFM @30PSI, 150 PSI Max, 70A current draw. Only IP55 rated, which is the main problem. I don't really think it's a good idea to mount it under the van. I could try to create a mostly water/splashproof box and use an air intake relocate kit into the interior of the van, but that's a decent amount of effort. I was thinking about trying to mount it in front of the driver side wheel in the bumper (same spot as the windshield fluid reservoir, just opposite side. Should be pretty protected and have good air with the front wheel liners installed. Problem with that is running the power wires for 70A over to CCP2 inside the cab - needs pretty thick wires and that space is already too crowded with my audio install. Running super thick gauge wire to the back passenger side of the van where my house electrical is seems a non-starter.
Viair 485C Compressor: $400, 1.67 CFM @30PSI, 1.36 CFM @80PSI. .
200 PSI Max, 23A current draw, IP67 Rated, 100% Duty cycle at 200 PSI.
Could mount this under the chassis no problem, wiring would be pretty easy and straightforward. But the fill rate seems low? Says 5.25 min to go from 0-30 PSI on a 37" tire, 1.5 min to go from 15-30 PSI. No clue what that means from going from 45-75PSI, but I'd assume it would take slower (6 min a tire?)
Continuous Duty OBA System | VIAIR Corporation
VIAIR’s Continous Duty Onboard Air System is an industry-leading, 200 PSI, 100% duty cycle 485C CE compressor, 2.5 gallon air tank, and all components needed to install a working system capable of inflating tires of virtually any size.
www.viaircorp.com
Viair 485C Dual Compressors: $525, 3.05 CFM @30PSI, 2.34 CFM @80PSI.
200 PSI Max, 44A current draw, IP67 Rated, 100% Duty cycle at 200 PSI.
Enough space under the chassis as well. Says 3.75 min to go from 0-30 PSI on a 37" tire, 1.8 min to go from 15-30 PSI.
485C Gen.2 Dual OBA | VIAIR Corporation
www.viaircorp.com
Anyways, just trying to figure out what I actually need. Seems like most people have compressors considerably less powerful than these (like Viair 88P, 1.25 CFM at 30PSI, .75 CFM at 80PSI, only 25min Duty cycle at 30 PSI)? Seems like this is not nearly adequate to get the van from air-down pressures back up to Highway pressures? Am I missing something?
