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Old 05-08-2013, 01:58 PM   #1
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OBA vs Portable

I'm looking to purchase an air system for my YJ. I'm trying to decided between OBA or Portable. What are some of the pros and cons to each. I'm leaning toward the Viair 440P. Any help would be greatful. Thanks

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Old 05-08-2013, 02:06 PM   #2
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I've been happy with my Tsunami for many years. Trail to street pressure in 2-3 minutes per tire.
About $60 in it,
MasterFlow MF-1050 or MV-50.

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Old 05-08-2013, 04:15 PM   #3
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A lot depends on how big your tires are, with my 31's and a Sureflow, or is it Superflow, MV50 it takes about 3-4 minutes for each tire to go from 10psi to 32psi. If you have 35's of bigger get a big pump or you will there a while.

Mine is portable and connects to the battery and works well for me.
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Old 05-08-2013, 06:46 PM   #4
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I'm running 35x12.50x15.
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Old 05-08-2013, 06:49 PM   #5
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A friend of mine has me thinking about doing a york compressor, but I do not know if I can make it work with my set up. I have a TPI 350 with a power pulley kit.
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Old 05-08-2013, 06:54 PM   #6
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Running a used York air conditioner compressor from an old Jeep pickup, Grand Cherokee, and some AMC and Fords is a cheap way to go and you get LOTS of air. The advantage of an on board system is not having to drag out your compressor and hose, just hook up your air hose and go. Do you ever want to run air tools on the trail? Get a double piston York if you can find one and you won't even need an air tank.

My OBA system will air up a 35 12.50 17 from 15 to 26 lbs in less than a minute. Personally, I hate spending 15 minutes putting air in my tires.

Kilby Enterprises makes some slick complete kits for this, or you can piece it all together to save. On my TJ, I bought Kilby's bracket and pulley and sourced my York from a junk yard and bought a 2 gal tank online someplace. On my JKU, I switched to a Warn PowerPlant with air... it's almost as fast as the York was.
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Old 05-08-2013, 06:59 PM   #7
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The York is a sweet setup no doubt. I have the VIAIR 400 P automatic and really like it. It does my 33's from 10 to 30 in about 2 minutes each. I'm very happy with it.
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Old 05-08-2013, 08:33 PM   #8
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Thanks guys for all the help. I'll do some looking and see what I can come up with.
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Old 05-08-2013, 11:07 PM   #9
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I run the 440p, it is awesome! Super fast and people always comment on how quiet it is .
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Old 05-10-2013, 02:15 PM   #10
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Just received my 450P-Automatic. Works great. I leaned to portable for "portability" in moving to another vehicle now and a new Jeep in the future. You can take your MOD with you. Set-up is a non issue with the kit and it never cuts off due to overheating. Very pleased with quality.

I will say I think your choice of the 440P is correct due to better fill rates. I would go with it over the 450 if I had it to do over.
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Old 05-20-2013, 11:51 AM   #11
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What size of tires have you used it on. How long did it take. I read somewhere that the times that are posted on Viair's web site are a little misleading.
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Old 05-20-2013, 05:45 PM   #12
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I run the 450P Automatic with 33-12.50 X 15's. Aired down to 12PSI, to airing up to Street Pressure at 29psi takes approx 2min. 10sec. per Tire.
NOT REALLY a long time by any meaning of the word. Less than 10 Min
for all four tires, drinking a Beverage of your choice, isn't really long at all.

Sure the 440 has a higher fill Rate at 4 something, BUT IT IS ALSO ONLY RATED at 33% Duty Factor. (meaning it needs to rest and cool down during its running period) On the other hand, the 450P is 100% Duty cycle, NEVER REQUIRING A COOLDOWN OR REST PERIOD.

The 440, fill one tire in 2 min, rest 2 = total 4min. My math showed that 2m10s per with no rest is faster. But hey, what's the RUSH ┐ It's NOT like running the BAJA with Pit Stops.
This is what I chose to do, others choose differently, and yet, you may even go another route as well.
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Old 05-20-2013, 06:24 PM   #13
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I don't shut the 440p off during refilling so it's always on for all 4 tires. I am curious to see it reach its 33% duty limit, but it's that fast that I probably never will.
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Old 05-22-2013, 01:08 PM   #14
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Quote:
Originally Posted by Predatormaster View Post
ratchettt
What size of tires have you used it on. How long did it take. I read somewhere that the times that are posted on Viair's web site are a little misleading.
255/75/17. I have not timed the air-up, but 17 to 37 SEEMED quicker than the gas pump compressors I have used. I'd like to know how long the 440 will run before shut down and how long it takes to come alive again. As I said I might have been better off with its higher fill rate. But one plus I just discovered this past weekend is that with the 450, I was able to offer air to other Jeeps without worry. Just a nice courtesy to be able to offer my riding group. It's a luxury item, but I consider the money some of the best I've spent.
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Old 05-22-2013, 01:10 PM   #15
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Quote:
Originally Posted by CoyoteOn2 View Post

The 440, fill one tire in 2 min, rest 2 = total 4min. My math showed that 2m10s per with no rest is faster. But hey, what's the RUSH ┐ It's NOT like running the BAJA with Pit Stops.
.
Are you guessing or is this correct? Thanks.
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Old 05-22-2013, 01:53 PM   #16
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Quote:
Originally Posted by ratchettt View Post
Are you guessing or is this correct? Thanks.
Maybe a bad assumption? Mine and others with the 33% duty cycle can probably run 30 minutes or more at the PSI required for airing up tires. The 33% is at 100 psi. I say probably because I have never run mine long enough for it to shut off. My 33x11.5's take about 2 minutes each.

I have aired my tires up and the handed it off to someone else to air theirs up with no issue. It was only shut off while moving from one tire to the next. It will get fairly hot and require some time to cool down when finished.

My personal believe is that the 33% duty cycle is a good trade off for the higher CFM than a compressor with 100% duty cycle and lower CFM.
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Old 05-22-2013, 02:46 PM   #17
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My dad and I got the Viair 400p, and I love that thing. We decided to go with the portable so we could share, and we're too cheap to buy two compressors. Fills dad's 35" tires pretty dang fast. I'd say no more than 2 - 2.5 minutes each. My 32" tires it pumps up SUPER quick. Overall, I'm pretty dang impressed with that little machine.
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Old 05-22-2013, 10:42 PM   #18
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Quote:
Originally Posted by Michigunman View Post
My personal believe is that the 33% duty cycle is a good trade off for the higher CFM than a compressor with 100% duty cycle and lower CFM.
x2
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Old 05-31-2013, 11:07 PM   #19
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A lot of good info. please keep it coming. I used a 400p over the weekend. it work well on my buddies 33's. I didn't think to time it. He had a leak and we were just trying to get it home.
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Old 05-31-2013, 11:17 PM   #20
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Quote:
Originally Posted by Off Pavement View Post
Running a used York air conditioner compressor from an old Jeep pickup, Grand Cherokee, and some AMC and Fords is a cheap way to go and you get LOTS of air. The advantage of an on board system is not having to drag out your compressor and hose, just hook up your air hose and go. Do you ever want to run air tools on the trail? Get a double piston York if you can find one and you won't even need an air tank.

My OBA system will air up a 35 12.50 17 from 15 to 26 lbs in less than a minute. Personally, I hate spending 15 minutes putting air in my tires.

Kilby Enterprises makes some slick complete kits for this, or you can piece it all together to save. On my TJ, I bought Kilby's bracket and pulley and sourced my York from a junk yard and bought a 2 gal tank online someplace. On my JKU, I switched to a Warn PowerPlant with air... it's almost as fast as the York was.
Oh yeah that is the way I am going. You don't want to run air tools on the trail but if you need to take something apart you do want to be able to then... LOL
I have to finish organizing parts. I am mounting the pump first after reconditioning it.

Quote:
Originally Posted by jeff_in_rc View Post
A lot depends on how big your tires are, with my 31's and a Sureflow, or is it Superflow, MV50 it takes about 3-4 minutes for each tire to go from 10psi to 32psi. If you have 35's of bigger get a big pump or you will there a while.

Mine is portable and connects to the battery and works well for me.
I heard from a friend it is worth getting a mv90. He says after his MVP 50 dies he will get one as a backup. He has a York OBA system.
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Old 05-31-2013, 11:26 PM   #21
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Originally Posted by CoyoteOn2 View Post
I run the 450P Automatic with 33-12.50 X 15's. Aired down to 12PSI, to airing up to Street Pressure at 29psi takes approx 2min. 10sec. per Tire.
NOT REALLY a long time by any meaning of the word. Less than 10 Min
for all four tires, drinking a Beverage of your choice, isn't really long at all.

Sure the 440 has a higher fill Rate at 4 something, BUT IT IS ALSO ONLY RATED at 33% Duty Factor. (meaning it needs to rest and cool down during its running period) On the other hand, the 450P is 100% Duty cycle, NEVER REQUIRING A COOLDOWN OR REST PERIOD.

The 440, fill one tire in 2 min, rest 2 = total 4min. My math showed that 2m10s per with no rest is faster. But hey, what's the RUSH ┐ It's NOT like running the BAJA with Pit Stops.
This is what I chose to do, others choose differently, and yet, you may even go another route as well.
Why would you rest it for 2 minutes? I was told by viair that I could run mine for 40 minutes before it needed to rest. I know I have filled up my 35s and other people's tires several times with out shutting it down

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