Viair 400P Automatic Portable Air Compressor - Pros & Cons - JeepForum.com
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Unread 08-27-2013, 10:58 PM   #1
RalphTomaccio
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2012 JK Wrangler 
 
Join Date: Dec 2011
Location: Bellingham, MA
Posts: 167
Viair 400P Automatic Portable Air Compressor - Pros & Cons

I'm considering adding a portable air compressor to my Jeep. After some research, I've found the Viair 400P Automatic Portable Air Compressor which appears to be a nice unit. I like the idea of a portable vs. permanent install. Right now all I have are stock 32's and don't see that I'll ever go beyond 33's in the future. Thus, the 35" rating of the 400P seems adequate.

http://www.viaircorp.com/400P-A.html

If you have recommendations for a different compressor, please tell me which one and why.

Also, I'd like to know your feelings about portable vs. permanent.

All opinions are most appreciated.

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Unread 08-28-2013, 12:56 PM   #2
jeepster93
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1993 YJ Wrangler 
 
Join Date: Sep 2006
Location: Englewood, CO
Posts: 3,965
I would go 100% duty cycle.
Just because you never know...you may need to fill someone else's tires and a 33% duty cycle would need to "rest". 33% is what...20 minutes of run time at no pressure load . It will take 15 minutes to fill your tires.
The nice thing about permanent mounting is it will always be there in the Jeep. The bad thing about permanent mounting is it will always be there, not here.
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Unread 08-29-2013, 12:01 PM   #3
JoeCitizen
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2012 JK Wrangler 
 
Join Date: Aug 2012
Location: OKC, OK
Posts: 76
OP: You've got me eye balling this thing now. It's looking good to me for my uses. According to the chart it only takes 2 minutes to fill a 33" tire (which is what I have) from 15 to 30 psi. As long as you wait 30 to 40 seconds between each tire you're good, as far as duty cycle is concerned. Heck, at my age it takes me nearly that long to put the valve cap back on and get to the next tire. Effectively a 100% duty cycle in my world. I never have and never will be deflating 38" tires down to 10 psi to go rock crawling then air them back up for the road. If I was, then I'd lay out the big dollars for a more robust compressor. For a couple hundred bucks it looks good to me and Viair has a good reputation. Doesn't sound like you'll be getting very aggressive with a build or off roading. The good onboard systems get pricy.
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