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Old 09-28-2020, 06:12 PM #46
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Quote:
Originally Posted by kaitlyn2004 View Post
The viair looks like ~1.5 CFM which seems low compared to others I see mentioned like the Smittybilt or the 400p. How do you find airing up with this smaller one - how long does it actually end up taking you?
Seems to work fine on my stock size tires. Takes probably around 60-90 seconds to air up from ~23-32 PSI for each tire. I haven't actually timed it but it doesn't take forever for sure. And for $65 it works for me.
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Old 09-28-2020, 06:29 PM #47
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Quote:
Originally Posted by FourT6and2 View Post

1. How much does the ARB dual compressor weigh vs a portable one and is it enough to make a difference as to where it's mounted/stored?

2. I can imagine having the compressor in the engine bay frees up storage/sitting space in the cabin? If you store a compressor on the floor behind the front seats, where do people's legs and/or other gear go?

3. What is the air-up time of your portable compressor vs the ARB dual?
- It's the same compressor, just in a plastic box with the air tank and accessories. The portable 'package' weighs more because of the air tank, but I can put the whole thing where it suits my use better.

- Good question. My 4Runner is a dedicated wheeler. I don't have rear seats so no legs back there--but plenty of gear space.
(Pic - The portable compressor is under the backpack, behind the driver seat. The Front Runner box in the middle isn't usually there)

- Another good question, but honestly I don't know or care. There is so much discussion about how fast some product airs down or how fast another airs up. So what?! I've never been on a trail ride with a group and someone caught heat because they were the last to air down or up. It's just internet noise.

Hope this helps.
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Last edited by WeedKillrr; 09-28-2020 at 06:37 PM. Reason: More information
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Old 09-28-2020, 06:37 PM #48
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Quote:
Originally Posted by rightyouareken View Post
Seems to work fine on my stock size tires. Takes probably around 60-90 seconds to air up from ~23-32 PSI for each tire. I haven't actually timed it but it doesn't take forever for sure. And for $65 it works for me.
Ya if you’re stock size then it’s fine. That’s also only 9psi it needs to air up. I have a little electric Kobalt compressor in my garage that can probably do 9psi in 2 minutes. If you go up in tire size you’ll likely need a bigger one.

I’m around 90 seconds to go from 18-40 but that’s the big Smitty 8721 at 5.65 cfm
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Old 09-28-2020, 06:55 PM #49
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Quote:
Originally Posted by WeedKillrr View Post
-
- Another good question, but honestly I don't know or care. There is so much discussion about how fast some product airs down or how fast another airs up. So what?! I've never been on a trail ride with a group and someone caught heat because they were the last to air down or up. It's just internet noise.

Hope this helps.
Kinda depends on what you're doing. It wasn't that long ago that the only available 12v compressors were more like this:


It was kind of a big deal if you wanted to run big tires - especially the bigger 38's and 40+ inch sizes - to have a faster compressor. The same would be true now if you wanted to use an ARB CKSA12 to fill tires, you'd be there for maybe an hour? or more. The difference between 5 minutes and 8 minutes? Not really meaningful to me. If it weren't for those old really slow units - things like the powertank wouldn't exist.

The other benefit to high volume is re-seating a bead. It's not always easy to get it to seal well enough. High air flow from the compressor really helps. And again - there was a time not that long ago that beadlocks meant re-centered H1's with big PVC pipe slices. Now they're a dime a dozen.

I think that's why the speed is still a relevant consideration. Among the good compressors it's probably not a big deal. They're all fast enough.
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Old 09-28-2020, 11:58 PM #50
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Quote:
Originally Posted by WeedKillrr View Post
Another good question, but honestly I don't know or care. There is so much discussion about how fast some product airs down or how fast another airs up. So what?! I've never been on a trail ride with a group and someone caught heat because they were the last to air down or up. It's just internet noise.
If you're talking about another ARB compressor you keep in a box that hooks up to the battery with jumper cables, that's one thing. But if you're talking about some Amazon air pump, that's another. Which is it?

The Smittybilt 2781, which was recommended in this thread, has a max airflow of 72 L/m. The ARB dual is 174 L/m. On paper, that's a big difference. No idea what that is in practice though. But 90 seconds per tire vs 5 minutes is a big deal for me when I'm getting eaten alive by mosquitos or it's pouring.
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Old 09-29-2020, 01:20 AM #51
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To air down I use the ARB E-Z Deflator $42:


I run Milwaukee tools at home and use the M12 compact inflator ($75) w/ a 6.0 battery to top off my cars + airing up from 15psi to 36psi. Not as fast as the $$$ compressors but it works for me. Set it and forget it.
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Old 09-29-2020, 09:03 AM #52
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Quote:
Originally Posted by FourT6and2 View Post
If you're talking about another ARB compressor you keep in a box that hooks up to the battery with jumper cables, that's one thing. But if you're talking about some Amazon air pump, that's another. Which is it?

The Smittybilt 2781, which was recommended in this thread, has a max airflow of 72 L/m. The ARB dual is 174 L/m. On paper, that's a big difference. No idea what that is in practice though. But 90 seconds per tire vs 5 minutes is a big deal for me when I'm getting eaten alive by mosquitos or it's pouring.
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Old 09-29-2020, 08:27 PM #53
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Quote:
Originally Posted by FourT6and2 View Post
But 90 seconds per tire vs 5 minutes is a big deal for me when I'm getting eaten alive by mosquitos or it's pouring.
Get a Coilhose Pneumatics CH15 Closed Lock-On Chuck for the end of your air hose - it locks on to the valve stem like a quick connect air fitting. If you've timed how long it takes to air up, you can hop back in the cab for that long before checking pressure and moving on to the next tire.
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Old 01-22-2021, 01:47 PM #54
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Quote:
Originally Posted by jrandom View Post
I missed this earlier, else I would have commented. I have a set of these, maybe I got a bad batch. The first time I used them I set them to 25lbs, installed them, they didn't shut off until between 10 and 15lbs all four! None were accurate, at all a couple pounds sure but 10 or more? I tried these a few times, same issues they don't stop deflating when they were "supposed to". Took them apart, cleaned, assembled, tried again, still issues. These are nicely made, doesn't really matter if they don't work, sadly at this point it was a waste of $100.

Have you checked your pressures after you used these? Were they accurate?
Hi jrandom! We are sorry to hear about the issue you are experiencing. Has someone from J.T. Brooks provided you with assistance? If not I would be more than happy to help.

Based on your description, it appears the desired PSI is set to the top of the lock ring, as opposed to the top of the body. This would account for the 10 PSI variance. Would you be able to confirm this is the case? Happy to assist further if you send us an email at [email protected].

Thank you!
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Old 01-22-2021, 01:47 PM #55
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Quote:
Originally Posted by blksubykid View Post
I have onboard air so I don’t have much input on portable air. My buddy runs the Viair 88P and it’s works fine. A little on the slow side but it gets the job done. As far as deflators go, I use these:

J.T. Brooks Automatic Tire Deflators PRO (ATDP4) Amazon.com: J.T. Brooks Automatic Tire Deflators PRO (ATDP4): Automotive

A lil pricy but I don’t have to constantly squat down. Damn I’m getting lazy LOL
Thank you for your support!
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Old 01-22-2021, 02:29 PM #56
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Which Portable Tire Pump is Best? Let's find out! - YouTube
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Old 01-22-2021, 02:39 PM #57
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I know most of us on here either have Viair, ARB or Smittybilt. I personally have the Viair 400p, but told myself if it ever stopped working, I would get the ARB Dual for faster air up. That was until I discovered a cheaper and faster alternative. I see that Summit has a 300lpm compressor for around $175, but it doesn't seem like a lot of people use them.

On paper, the Summit has nearly double lpm and half the cost. Has anybody here had experience with the Summit one?

Summit Dual Air Compressor - Summit Off-Road Wheels
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Old 01-22-2021, 03:01 PM #58
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Quote:
Originally Posted by J.T. Brooks View Post
Hi jrandom! We are sorry to hear about the issue you are experiencing. Has someone from J.T. Brooks provided you with assistance? If not I would be more than happy to help.

Based on your description, it appears the desired PSI is set to the top of the lock ring, as opposed to the top of the body. This would account for the 10 PSI variance. Would you be able to confirm this is the case? Happy to assist further if you send us an email at [email protected].

Thank you!
Sorry, I forgot to edit my original post. Yes, you guys were super fast to respond and explained exactly the issue! They work great and have been very happy with them ever since!
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Old 01-22-2021, 03:07 PM #59
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I just picked up the Viair 450P and love it. I use the Staun deflators and like those also. The deflators get mixed reviews on Amazon but so far I like them. I’ve used them 3 times on the trail and a few of my buddies use have them. They weren’t preset to 18psi from the factory like stated but it didn’t take me long to get them to within a .5 psi of each other. I haven’t timed the fill time but it’s quick. I can fill my tires from 15 to 32 psi in one duty cycle. You could probably do more but by then the compressor is pretty warm so I like to let it cool down on between trucks.
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Old 01-23-2021, 03:09 PM #60
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Looking for a good deflator w/ pre-set PSI shut-off

It seems that the VIAIR 300P is good option for portable compressors. Are there any good suggestions for a deflator that has an option to set a specific PSI to shut off at?
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