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Old 02-03-2018, 04:20 PM   #1
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Viair 400P-RV v 450P-RV

I have looked at both models on the Viair and Amazon websites. MSRP for the 450 is $30 higher than 400 but Amazon discounted price is $13 higher for the 400. The 400 has higher air flow than the 450 - 2.30cfm v 1.80cfm, 400 will air up a large RV tire 30% faster than a 450. 450 is 3 pounds heavier. All other specs are virtually the same.

Logic leads me to believe the 400 may perform better but the 450 is more durable. Can someone with experience with the models help me out here?

Thanks!
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Old 02-03-2018, 04:21 PM   #2
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I have both but the 400 is still in it's box due to the shouter duty cycle and the size of my tires (365/70 tag and front axle and 315/80 drive). Takes a while to top them off plus I figured it'd be a heavier built unit.
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Old 02-03-2018, 05:32 PM   #3
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Note the 400 is 33% duty cycle and the 450 is continuous, at least per the Viair website here (this is for the C's, the H's have the same duty ratings). That will make a difference if you have a very low tire.

BTW I have a 380C and really like it, I'm sure I've abused it because the rating drops to 55% at 200PSI and I sometimes run it continuously at 150 to 175PSI, and it never has overheated or shut down.
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Old 02-03-2018, 05:36 PM   #4
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Originally Posted by Luv2go View Post
Note the 400 is 33% duty cycle and the 450 is continuous, at least per the Viair website here (this is for the C's, the H's have the same duty ratings). That will make a difference if you have a very low tire.
Agree, I would go for the 450 with 100% Duty cycle for the extra few bucks.
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Old 02-03-2018, 05:36 PM   #5
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I really like the Viairs, but I can buy 3x 150psi pancake compressors for the same price! Since I have an on-board generator, I'll always (ok, not always) have 120vac available.
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Old 02-03-2018, 05:40 PM   #6
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Old 02-03-2018, 07:23 PM   #7
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I went with the 450 due to the duty cycle thing. I found it can take a bit to air up all 4 trailer tires to 110 PSI, and bring the truck tires up to 80psi, and put a squirt in the pin box air bag if things have been sitting for awhile. The truck tires run quite rough when empty so I air them down to 60 or so if I'm not going to be hooked up for any length of time. So far, I'm very pleased with the little viair. It actually sustains a higher air flow at pressure than my 4hp craftsman in the garage, without the trouble of the 125psi shop units pressure cutoff switch causing issues on the trailers 110psi tires.
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Old 02-04-2018, 09:56 AM   #8
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450 is the hot ticket. Bought one several years ago to air up tires on Jeep after riding in Mts. Worked great! Then I tried it on Coach tires to air up on previous HR and Cornerstone. It will easily air up 365 70 R22.5 front tires! Duty cycle is the thing on 400.
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Old 02-04-2018, 10:03 AM   #9
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Thanks for all the good input! I ordered a 450!
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Old 02-04-2018, 10:29 AM   #10
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Originally Posted by Searching_Ut View Post
I went with the 450 due to the duty cycle thing. I found it can take a bit to air up all 4 trailer tires to 110 PSI, and bring the truck tires up to 80psi, and put a squirt in the pin box air bag if things have been sitting for awhile. The truck tires run quite rough when empty so I air them down to 60 or so if I'm not going to be hooked up for any length of time. So far, I'm very pleased with the little viair. It actually sustains a higher air flow at pressure than my 4hp craftsman in the garage, without the trouble of the 125psi shop units pressure cutoff switch causing issues on the trailers 110psi tires.
I bought one back in 2006......used it for 7 yrs FT and still use it around the S&B/garage

Can't remember if it is a 400 or a 450
Just know that it WORKS great airing up the G614s to 110# and pumping up the trucks rear tires from 45# to 80# every week when we traveled.

I changed out air chuck to the style that locks onto valve stem.....connected it/turned compressor on and went about my 'breaking camp' duties.
Did both truck rear tires then would do quick check/adjustment to trailer tires as needed

11+ yrs and still going strong
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Old 02-04-2018, 11:19 AM   #11
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Quote:
Originally Posted by cruzbill View Post
I really like the Viairs, but I can buy 3x 150psi pancake compressors for the same price! Since I have an on-board generator, I'll always (ok, not always) have 120vac available.


All true, but I just bought a 450 and gave my 150-psi Porter-Cable pancake to a friend to get the space savings. YMMV.
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Old 02-04-2018, 02:47 PM   #12
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Thanks for all the good input! I ordered a 450!
And you saved basement storage for important things like a place to keep the wine.
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Old 02-04-2018, 02:50 PM   #13
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Just ordered the 450-rv off eBay for 199.00
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Old 02-04-2018, 07:07 PM   #14
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Agree, I would go for the 450 with 100% Duty cycle for the extra few bucks.


450 with 100% duty is key. You wonít burn it up from continuous use, unlike those that are not 100% duty free which may need to be shut off to cool down before continuing.

Cheers
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