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Old 01-30-2019, 07:50 PM #1
gundrted+t4r gundrted+t4r is offline
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Question Setting Up Removable On-Board Air - Suggestions and Help

I have a '17 TRDORP. I've been looking at On-Board Air (OBA) for some time. I haven't done off-roading and I can't justify spending a ton of money on something I will hardly use.

Last year I ended up with a Viair 450P-RV Automatic Compressor. I bought it for my truck camper after having to use the spare and it wasn't up to pressure. It's a great little compressor. I also setup a regulator that allows me to fill my mountain bike tires while camping. I got a digital air chuck/gun and swapped the the hose with a Topeak bike pump head. I also added a quick disconnect to remove the Topeak and use a standard air chuck.

This got me to thinking about using the same setup in my 4Runner.

Realistically, I would be using this setup for high volume low pressure mountain bike (MTB) tires. Depending on our pressures go between 9 - 19psi (29+ and 27.5/27.5+).

The 450p will fit into the space under the hood in front of the passenger side firewall. I'm a little worried about using it there because I don't want the compressor getting dirty. It is not rated for being exposed to dirt or weather.

This lead me to look at the rear cargo area. All our MTB gear is already back there and so are the bikes. I haven't tested the compressor on the rear 12v outlet. I'm hoping low pressures will equal the lowest power draw for the compressor. The compressor also only needs to run for a few seconds at a time per tire.

I'm thinking of the following configuration.
  • AC/DC Power Relay plugged into the rear 110v outlet
  • Viair 450p plugged into the rear 12v outlet with the relay controlling the power
  • Viair 450p in some type of enclosure (ammo can, plastic bin, ...) and secured in the cargo area
  • AC/DC Power Relay is located in the storage enclosure

Using the compressor
  • Turning on the 110v plug activates the relay
  • The relay allows power to flow to the compressor that is switched on
  • MTB tires are filled
  • 4Runner is turned off or 110v plug is turned off

I have a sliding rear deck and it looks like I could mount an air fitting to the underside of it. This would allow the air hose/chuck to be attached easily at the rear.

Thoughts on all this ....


Parts List

Enclosed AC/DC Power Relay with Protection & De-Bounce. Screw Terminals. 120V Trigger Input. by DLI
https://www.amazon.com/Enclosed-AC-P.../dp/B017743I7S
Price: $12.95
Quote:
Safe and easy to install. Controls any AC or DC device.
Durable high current relay for long life and reliable switching.
De-bounce circuit for safety. Dry contact relay output - connect to any voltage circuit.
Thermal switch and circuit breaker add safety, limiting current to 15 Amps.
Includes detachable power cord.




Viair 450P-RV Automatic Compressor
450P-RV Auto Portable Compressor | VIAIR
PERFORMANCE DATA
Quote:
PSI CFM A BAR LPM A
0 1.80 12 0 51.0 12
10 1.75 14 1.0 47.6 15
20 1.60 16 2.0 43.3 17
30 1.52 17 3.0 38.2 18
40 1.39 18 4.0 34.0 19
Quote:
SPECIFICATIONS
-12-Volt
-Permanent Magnetic Motor
-Duty Cycle: 100% @ 100 PSI
-Max. Working Pressure: 150 PSI
-Max. Amp Draw: 23 Amps
-Ingress Protection Rating: IP54
-Dimensions: 10.87in L x 5.8in W x 7.48in H
-Net Weight: 13.05 lbs.
-Power Cord Length: 8 ft.
-Primary Air Hose Length: 30 ft.
-Extension Air Hose Length: 30 ft.




ARO R37121-600-VS Air Regulator 1/4" NPT, w/ Gauge - 250 psi Max Inlet
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


TORQIFY AT875 Tire Inflator Air Tool with Digital Pressure Gauge
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


Topeak SmartHead Bicycle Floor Pump Upgrade Kit
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


Photo of setup in my truck camper while in Fruita, CO

Last edited by gundrted+t4r; 01-30-2019 at 08:11 PM.
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Old 01-30-2019, 09:12 PM #2
Jimmyasheville Jimmyasheville is offline
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Seems like a lot of time trouble and money to pump up your mtb tires😄. How bout some pics if your bikes, in action maybe. And a pic of how you fit them in a 4 Runner! Thanks
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Old 01-30-2019, 09:28 PM #3
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Quote:
Originally Posted by Jimmyasheville View Post
Seems like a lot of time trouble and money to pump up your mtb tires😄. How bout some pics if your bikes, in action maybe. And a pic of how you fit them in a 4 Runner! Thanks
Hahaha ... no kidding right ... I've been filling the tires at home with my garage compressor. I still throw my old Topeak in the back just in case. It is overkill, but it would be cool.

Maybe a fridge with cold beers or a margarita maker would be cooler







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Old 01-30-2019, 10:00 PM #4
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I agree that this is a whole lot of work and expense to pump up a bike tire. A bit of a Rube Goldberg Machine for such a simple task. I have used a floor pump forever... the only time a compressor is needed is when seating the bead on a fresh tubeless setup on occasion... which youíd do in your garage, not from the back of your car at the trailhead. Typically, the tire isnít completely flat, so you really only need about 3 pushes on the floor pump.
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Old 01-31-2019, 12:52 AM #5
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Do you think that setup would inflate a blow up paddle board? Now thatís one freakin hand pump I donít want to mess with.
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Old 01-31-2019, 01:55 AM #6
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I did a Viair 400P under the hood with no issues. Pretty easy install.
Viair Install
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Old 01-31-2019, 02:28 AM #7
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Quote:
Originally Posted by tigger View Post
I did a Viair 400P under the hood with no issues. Pretty easy install.
Viair Install
Great job! This is exactly what I was looking for. Thank you.
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Old 01-31-2019, 03:29 PM #8
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Quote:
Originally Posted by Jimmyasheville View Post
Do you think that setup would inflate a blow up paddle board? Now thatís one freakin hand pump I donít want to mess with.
If you get a constant duty model like the 450P, yes it should inflate anything you hook it to. The question is how long it would take. Also, for something like a large like a tire or paddle board, you would want the compress connected directly to the battery and the engine running.
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Old 01-31-2019, 03:41 PM #9
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Quote:
Originally Posted by tigger View Post
I did a Viair 400P under the hood with no issues. Pretty easy install.
Viair Install
Thats a nice install. i didn't think to mount it on the fender. Have you had any issues with dirt on the compressor?
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Old 02-01-2019, 01:54 AM #10
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Quote:
Originally Posted by gundrted+t4r View Post
Thats a nice install. i didn't think to mount it on the fender. Have you had any issues with dirt on the compressor?
It would get dusty, but turn it on, and blow it off. As long as you don't go through seriously deep water, you shouldn't have an issue. Just change out the filter when needed.
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Old 02-01-2019, 03:06 PM #11
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Quote:
Originally Posted by tigger View Post
It would get dusty, but turn it on, and blow it off. As long as you don't go through seriously deep water, you shouldn't have an issue. Just change out the filter when needed.
Good to know. The last thing I wanted to do is kill the little guy and have to buy a new one.

Quote:
Originally Posted by GearJunkie88 View Post
I agree that this is a whole lot of work and expense to pump up a bike tire. A bit of a Rube Goldberg Machine for such a simple task. I have used a floor pump forever... the only time a compressor is needed is when seating the bead on a fresh tubeless setup on occasion... which youíd do in your garage, not from the back of your car at the trailhead. Typically, the tire isnít completely flat, so you really only need about 3 pushes on the floor pump.
Yes, this is complex. I already have the compressor for my truck camper.
I would like to put the pump the good use and not have it collecting dust. The flip side is, I've already the bike tire inflation setup done [regular, air gun and chuck]. That's half the battle.

In a perfect world, I would like 'sled' [as my engineering friends call it] that I could drop into my 4Runner or Camper. Maybe even include a .5gal tank at some point.
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Old 02-01-2019, 03:34 PM #12
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Quote:
Originally Posted by gundrted+t4r View Post
Quote:
SPECIFICATIONS
-12-Volt
-Permanent Magnetic Motor
-Duty Cycle: 100% @ 100 PSI
-Max. Working Pressure: 150 PSI
-Max. Amp Draw: 23 Amps
-Ingress Protection Rating: IP54
-Dimensions: 10.87in L x 5.8in W x 7.48in H
-Net Weight: 13.05 lbs.
-Power Cord Length: 8 ft.
-Primary Air Hose Length: 30 ft.
-Extension Air Hose Length: 30 ft.
you won't be able to run that off of the rear 12v outlet, you'll blow the fuse.

you'll need to run at least 10-ga wires to the back from the battery to power it, you can add a relay under the hood and switch in the cab if you want switched power

(i assume the ac relay was so you didn't have to run wires and switch for a dc relay?)
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Old 02-01-2019, 04:28 PM #13
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Quote:
Originally Posted by jhguth View Post
you won't be able to run that off of the rear 12v outlet, you'll blow the fuse.

you'll need to run at least 10-ga wires to the back from the battery to power it, you can add a relay under the hood and switch in the cab if you want switched power

(i assume the ac relay was so you didn't have to run wires and switch for a dc relay?)
You are correct, however you are looking at the max draw. The max draw occurs at/near the max psi and lower cfm through-put. There is no expectation around filling car/truck tires with the rear 12v plug.

10ga wire would be complete overkill for something like this. 8ga would be just a waste of wire. The attached power cable doesn't have an XXga printed on it. Its a little larger than my Battery Tender cables (18ga). I would put the OEM cable at 14ga or maybe 12ga.

A high volume mountain bike tire basically allows the pump to run at its highest cfm and lowest resistance. The pump runs for about 5-15 seconds at between 5psi and 15psi. The table below outlines the manufacture specs around pressure, cfm and amp rating.

PERFORMANCE DATA
PSI CFM A
0 1.80 12
10 1.75 14
20 1.60 16
30 1.52 17
40 1.39 18
50 1.27 19
60 1.18 19
70 1.09 20
80 1.04 20
90 0.97 21
100 0.94 22
110 0.90 23
120 0.86 23
130 0.81 22
140 0.76 21
150 0.72 20
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Old 02-01-2019, 04:48 PM #14
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its more than double the outlet's rating at max, every amperage on your chart exceeds the 120W rating. you'll blow a fuse.

and yes if you run that to the back a 30' run for 25A means 10awg. the oem cable is short, it doesn't need to be more than 12 awg. you could step down to 12awg if you keep your wiring direct and ground in the rear.

Last edited by jhguth; 02-01-2019 at 04:59 PM.
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Old 02-01-2019, 05:23 PM #15
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Hmm .... I didn't realize the output was that low on the rear socket.
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