Viair 300p vs 400p: Which Portable Compressor Is Better?

The problem with putting air in our tires is that it’s often the last thing we think about. We see the air is low and tell ourselves “oh I must do that”, and then we forget. Now having enough air in your tires is extremely dangerous and can cause accidents. Fortunately, there is a simple and cost-effective solution- portable compressors.

Viair has a solid reputation for manufacturing portable compressors, in particular, the Viair 300p and the Viair 400p. Today, we are going to discuss the similarities and differences of these two off-road and on-road air compressors. We will add a comparison chart with all their features and some pros and cons. Our final verdict will help you with your choice.

Viair 300p vs 400p

We will start with what the Viair 300p and the Viair 400p have in common.

Viair 300p vs 400p – Similarities

Uses

The Viair 300p and the Viair 400p can be used with any vehicle that has a 12v battery. All you need to do is attach the battery clamp power leads to the battery, attach the level style chuck to your tire valve and turn the air compressor on. The amount of pressure can be read using the 5-in-1 inline inflator/deflator hose and gauge.

Motor

Both the Viair 300p and the Viair 400p have a 12v, 30 amp motor. They are permanent magnetic motors.

PSI

PSI is a measurement of force, specifically pound (or pound-force) per square. The Viair 300p and the Viair 400p are both powerful compressors with a maximum PSI of 150.

Duty Cycle

This is a percentage that indicates the amount of time a compressor can be used in a certain period of time. The percentage is based on 100 PSI at a temperature of 72ºF. For an easy example, a compressor that has a 25% duty cycle means it can be used for 10 minutes and then off for 30 minutes. The Viair 300p and the Viair 400p have a 33% duty cycle.

CFM

CFM stands for cubic feet per minute and measures the speed of the airflow. The Viair 300p and the Viair 400p have a 2.30 CFM at 0 PSI.

What’s Included

The Viair 300p and the Viair 400p come with everything you need. You will receive a deluxe carry bag, a 25ft 5-in-1 inflator/deflator open-ended air hose with 120 PSI gauge, a heavy-duty sand tray with vibration isolators, a set of heavy-duty direct battery clamps, an 8ft power cable, a 3 piece inflation tips kit, an inline fuse holder, and an owner’s manual.

Side by Side Comparison

VIAIR 300P

VIAIR 300p

  • Size: 9 x 7.5 x 4.9 inches
  • Weight: 8.7lbs
  • Voltage: 12v
  • Amps: 30Amp
  • Maximum PSI: 150 PSI
  • Tire Size: 33”
  • CFM: 2.30 CFM
  • Duty cycle: 33%
  • Fill rate: 0-30 PSI- 5mins/ 15-30 PSI- 2 mins 45 secs
  • What’s Included: deluxe carry bag, 25ft 5-in-1 inflator/deflator open-ended air hose with 120 PSI gauge, a heavy-duty sand tray with vibration isolators, set of heavy-duty direct battery clamps, 8ft power cable, 3-piece inflation tips kit, inline fuse holder, and an owner’s manual.
  • Warranty: 1-year

VIAIR 400P

VIAIR 400p

  • Size: 10.87 x 5.83 x 7.48 inches
  • Weight: 10.4lbs
  • Voltage: 12v
  • Amps: 30Amp
  • Maximum PSI: 150 PSI
  • Tire Size: 35”
  • CFM: 2.30 CFM
  • Duty cycle: 33%
  • Fill rate: 0-30 PSI- 5mins/ 15-30 PSI- 2 mins 40 secs
  • What’s Included: deluxe carry bag, 25ft 5-in-1 inflator/deflator open-ended air hose with 120 PSI gauge, a heavy-duty sand tray with vibration isolators, set of heavy-duty direct battery clamps, 8ft power cable, 3-piece inflation tips kit, inline fuse holder, and an owner’s manual.
  • Warranty: 1-year

For the next part, we will focus on how the Viair 300p and the Viair 400p are different.

Differences Between ViAir 300p and ViAir 400p

Appearance

VIAIR 400p Comparison

The design of the two portable compressors is the same, they are both compact and silver. There is a slight difference in their dimensions.

Viair 300p

After confirming our measurements with Viair, this measures 9 x 7.5 x 4.9 inches and weighs 8.7 pounds.

Viair 400p

The 400p is larger and weighs more too. It is 10.87 x 5.83 x 7.48 inches and 10.4 pounds.

The Winner Is- The Viair 300p

Tire Size

VIAIR 300p Comparison

Air compressors are designed to be used with certain tire sizes.

Viair 300p

This portable air compressor is suitable for tires up to 33 inches.

Viair 400p

Here, the tire size is up to 35 inches.

The Winner Is- The Viair 400p

Fill Rates

VIAIR 400p Review

The fill rates are the approximate time it takes to inflate a tire at 12v.

Viair 300p

To inflate a 33 x 12.5-inch tire from 0 to 30 PSI it takes 5 minutes. At 15 to 30 PSI is takes 2 minutes and 45 seconds.

Viair 400p

For a 35 x 12.5-inch tire from 0 to 30 PSI is similar at 5 minutes and 5 seconds. At 15 to 30 PSI it’s just 2 minutes and 40 seconds.

The Winner Is- A Tie

Read next – Viair 70p vs 85p: Which Portable Compressor Is Better?

Value for Money

VIAIR 300p Review

For a high-powered portable air compressor like these, you could expect to pay anywhere from $250 to $500. The value for money also depends on what is included and the warranty.

Viair 300p

It is well below the average cost and a little less than the Viair 400p. It comes with an excellent range of accessories and a one-year warranty.

Viair 400p

Even though it is more expensive than the Viair 300p, it is still excellent value for money with the same accessories and the same one-year warranty.

The Winner Is- The Viair 300p

Pros and Cons

Just before our final verdict, we have a few pros and cons for the two Viair portable compressors.

Viair 300p

Pros:

  • It’s quick for all types of vehicles from cars to full-size van tires
  • It’s nice at quiet when in use
  • All the parts and accessories are made of good quality materials

Cons:

  • Longer hose and/or power cord would make using it a bit easier

Viair 400p

Pros:

  • A very durable and reliable portable compressor
  • The sand tray really helps to keep it stable
  • It’s nice and easy to use

Cons:

  • It would be nice to see something extra for the additional cost

The Final Verdict

Today was a very difficult decision because the Viair 300p and the Viair 400p are so similar. First of all, it will depend on your tire size as the Viair is more suitable for 33” tires while the Viair 400p is better for 35” tires. After this, we felt that the Viair 300p was the better buying option. Both portable compressors are fast, quiet and reliable. And the downside about the hose length is also true for the Viair 400p. As the Viair 300p is a little cheaper, we felt it was better value for money.

 


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