OBA -> On Board Air Mega Thread & BS

http://www.ebay.com/itm/PUMA-12-VOL...347?pt=LH_DefaultDomain_0&hash=item41606c53eb

 

Thanks.

Yeah I have a pressure switch for on at 90 and off at 120, so it'll always meet that minimum. I think I'll just get the Viair regulator since you can mount it somewhere clean.

$43 Viair Inline Air Pressure Regulator, 0-200 psi, Black, 90150

http://www.amazon.com/gp/product/B000YC5IFG/ref=gno_cart_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

 

ARB. They offer a graph but no real break down of the CFM/PSI like all the other big name manufactures do. They're still the most simple plug and play OBA set ups available for those with lockers etc


Viair makes reliable compressors no doubt. I'd be going with two 450c's if the Air zenith OB2 wasn't so appealing. I was in the mini truck scene from 2001 till 2006. my old S10 even made it into Truckin magazine amongst some others so I've seen em all in action and worked on em too

The ultimate compressor for OBA is engine driven or an Oasis. Unless you want to roll with a cylinder of nitrogen or co2

 

Yeah, I'm just used to people who like to pole vault mouse turds. They get gear crazy, when sometimes less and simpler is better. They get all anxious about saving up for a big compressor and doing OBA, when their budget and needs is just a small entry level jobber they can keep in a bag.

 

Honestly, I can get like that. I love my stuff. I make a point to use it, but definitely love going over the top. That is part of the reason I want to run a CO2 tank. Seems simple, portable and powerful. Then if/when I get a locker I can still use the CO2 or then Get a compressor.

 

I am running three-way ASCO 12 volt solenoids for the lockers because I don't like the hinky threads on the ARB solenoids. I use a Viair 400C compressor which is 3.92 CFM at 30PSI so pretty good for airing up tires. My system has a 3 gallon steel tank (might have gone with aluminum for rust issues, but too late now.)

I have a regulator after the air hose feed specifically for the lockers. 80PSI is what I use, but sounds like I should crank it up to 90. Oh, if you use a regulator set with a GOOD pressure gauge in the system, the $10 cheapies can be quite a bit off.. I have a liquid damped Ashcroft gauge (2% accuracy) on the manifold.

 

How stable is the pressure in a CO2 bottle? And if it is over the ARB max rating you will need a regulator, if it is below 85 PSI you have open diff truck. CO2 may meet your needs (and I have never used it so not experienced), but if your bottle is low when you need it you are screwed if you ar not coming home from the mall.

 

ahh good to know. Yea I went with the Viair one because of the brand, but I was pretty close at going for cheap one lol. hope it ends up being accurate

 

Didn't think about it at the time, but you'd also be limited with how you can mount the CO2 so you aren't sucking liquid into the system.

 

What size airline and valves does everyone run to the lockers? Rust really isn't a concern, just make sure you drain the tank. In the colder weather its also advisable to put some air brake anti-freeze in your tank so your valves don't get frozen open/closed because of moisture in the system.

CO2 is fairly stable, although when it heats up you run the risk of bursting a relief valve like any compressed gas in a cylinder. Will DEFINITELY require the use of a regulator.

Some of the smaller gauges are all the same and just re-branded for the most part. I'd test it on a tank with a pressure switch to see if its close enough.

 

Also something to be weary about when purchasing a used tank to make your own setup, you do not want a siphoning tank because you'll be releasing liquid CO2 instead of its gaseous form. You need an ANTI-SIPHONING tank.

EDIT: Not sure if this has been posted. a DIY CO2 OBA build for around ~$200.00

http://forum.ih8mud.com/winching-re...co2-tank-system-high-quality-lowest-cost.html

 

You also have to make sure it's mounted upright. Installing on its side, upside down, etc, will just defeat the anti-siphon.

 

Skygear -- what model compressor is that pictured on the metal bulkhead behind the light? Crawled around under my truck today debating my options. Curious as to what model that is, so I can see if the Air zenith I'm planning on using measures out similarly. EDIT: The damn AZ OB2 Compressor weighs in at 19lbs...wonder if it can even handle that weight bouncing around on it??

Where'd you get that 5 gallon tank? Looks like it fits tight up there with very little hanging out.

I really want to go aluminum but a pancake tank is sounding like the better option. I could easily mount to the factory spare x-member and have more air capacity. Plenty of misc sized ports so I won't need a manifold block pending the compressor stainless steel leader hose reaches the tank.


Worried about having low hanging fruit though...supposedly its 8" tall, not sure if that's including the mounting legs.

 

The tank i picked up is the Accu Air 5 Gal Aluminum tank. I went with them for 1 reason. The tank did not have the mounting brackets welded onto it. instead there were 2 bolt holes. Their tanks have numerous holes on them too. I would have to look again, but iirc, theres 2 on either side (4 total), 3 on the front, 1 on the bottom. Might be more there I cannot remember. After mounting it there. I really was considering going up to a 7 gal or 9 gal. Looked like I could squeeze one in there.

I know you want that pancake tank, Cant sway you, thats fine. things work for different people. Realistically, the mounting spot I chose is optimal for a tank. Couple hose clamps and your golden.

Compressor is the 400 series viaiar. All of them are the same form factor. Some longer than others.

As far as weight goes, those bulkheads are part of the bed. Part of where the tailgate connects to the bed. So it has to be durable. As long as you bolt it down securely and it is not actually ''bouncing off of it", you should be fine. Strip that monster down, take any base plate off and se if you can shove it up there on the passenger side. remove your inverter plug to assist in the hand off if you have a second person. @~20#, I would recommend a second person. .

There was clearance on both sides of the compressors and I had plenty of room to either go farther up on that bulkhead, or lower it some.

Your choice in tanks is worrying me. If you have no armor there, boy, you will shear some connections off, even if they are 90º fittings, shearing could be a real and present danger.

Might be able to mount a smaller capacity tank in the same area on the opposite side. (fender area, bulkhead) - I mean, people have mounted spare battery's there. Why not an air tank.

 

An even bolder idea. You could take your compressor and mount it right side up. Farther up in the fender above the cubby boxes. Take a couple pieces of steel, bolt one side to the bulkhead there. The other, you could put a couple holes in the fiber bedside to support the bracket.

 

So is a small 5 gallon tank like that very beneficial for you guys? I didn't bother running a tank with my compressor because once it is empty you are now filling up the tank and the tire at the same time there by slowing it down. I haven't messed around with a tank but I don't see a small one lasting long enough to fill more than 1 tire. But I'm pretty sure that adding 5 gallons to each tire will drastically slow down filling a tire. It would be like turning a skinny 33 into a wide 40 or worse...

 

Not dead set on a pancake tank by any means, there is a pancake tank floating around that has bungs on both sides, so I could just plug the ones facing the ground. Reason I don't want to hose clamp my tank to the hitch receiver is because I want to prevent further re-work if I ever upgrade to a plate bumper. Going to do some more poking around. What I really want to do is hack the stock spare tire xmember out and build a custom xmember like we used to do on bagged rides after installing C-notches. Not cost effective though.

As far as mounting the compressor, I might have to just bite the bullet and order the Air zenith OB2 and do some test fitting and re-evaluate plans as necessary. Considering it's double the weight! & physically larger then the Viair 400 series. (2.2" longer, 2.2" wider and 1.3" taller)

I see what your saying....but The tank isn't run completely dry when your compressor kicks on, it depends on your pressure switch. I realistically think I can fill one 35" easily (from trail PSI to road PSI) on the tank pressure alone (5 gallons @ 200 PSI). By the time I make it to the next tire the compressor will have caught up enough to re-fill the next 35.

 

Just crawled around the truck with a headlamp, Neighbors think I'm nuts I'm sure.

These 2 Gallon AVS tank's appear like they will fit INSIDE the top of the bedsides. For a super low profile/hidden set-up.


Would have to figure out some sort of strap mounting system to the composite bedside though, I really don't want to drill into the bed. Also a lot more air line plumbing and cost to stuff these up there. One per side for a measly 4 gallons.

37.5" length x 4" Diameter.

 

Like this! Dunno if this is in your long list of OBA idea links...

 

As far as the space goes for the compressor. Look at this space here.



If you take the measurements, and use a piece of paper to adjust for scale, you would be able to measure and see if the compressor you want or have will fit in there. the height and length are null points in that location. the width would be a factor to measure but not an issue from what I remember measuring back there. Just glancing at it. You would still have enough clearance.