We found it to be generally accurate within a 2 PSI, range which is fine for most circumstances. To test the accuracy of the 88P, we compared the air pressure displayed on the gauge to that of a simple pencil-style gauge. That’s enough to drown out any conversation you might have and will definitely disturb the household if you use it in your driveway. But it usually hovered between 96 and 97 decibels. When we used a decibel meter to measure how loud it got, the highest sound level we recorded was 99 decibels. The Viair 88P was the loudest of all the products we tested. Pumping air through a compressor makes a lot of noise. Which is the fastest average fill time we recorded during our testing period. On average it took about 55 seconds to inflate all four tires. It stayed hot to the touch for about five minutes after shutdown, so you’ll want to wait a bit after your done pumping to wrap it up and put it away. We measured its surface temperature with an infrared thermometer and found the hottest it got was 86 degrees Fahrenheit. The exposed metal components of the compressor are slightly hot to the touch. However, unless you’re inflating something particularly large, it’s unlikely that you’ll reach the 25-minute limit. We recommend at least 10 minutes of cool-down time before you try to use it again. You can run this portable air compressor continually for about 25 minutes before you need to shut it down for a few minutes. On average it took about 55 seconds to inflate all four tires, which is the fastest average fill time we recorded during our testing. Stopping at gas stations and rest stops along the way, we deflated the tires on Kia Rio to 20 PSI (to the point where they would be dangerous low to drive on) and then used the pump to inflate them back up to recommended 32 PSI. When we tested this portable tire inflator, we took it on an interstate road trip, many miles into the wilderness. Lifewire / Jeffrey Daniel Chadwick Performance: Raw power that never failed us Instead, it features an analog pressure gauge that displays pressure in up to 120 PSI (pounds per square inch) and 8.5 kPa (kilopascals). This is the only portable air compressor we tested that lacks a digital readout. So although you almost certainly will never reach the upper temperature threshold, you can be sure that this pump will perform when you need it in the desert during a heatwave. Most portable tire inflators don’t publish their maximum operating temperature, so it’s anyone’s guess at what point they cease to work. The 88P’s can withstand a maximum ambient pressure up to 158 degrees and as low as -4 degrees Fahrenheit. Other products we tested all had hoses that were around 3 feet, limiting their flexibility.Īnother big benefit of having a hefty pump is that you can operate it in extreme temperatures. The air-hose on this portable tire inflator is a lengthy 16 feet and Viair sells a 6-foot extension for an even greater range. The most visible of which is the range of the pump. However, there are some perks that come with the extra power provided by your engine. Drawing power from the 12V socket allows other tire inflators to work while the car’s power is turned on but not the engine. Additionally, it means that your engine must be running for the pump to work. This is good in that it ensures that the pump gets the power it needs to run efficiently, but it also adds several steps to the process of getting your tires filled.Īll the other products we tested allow you to simply hook an adapter into your car’s 12V socket, which is far more convenient than attaching power clamps to your battery. In order to use it, you must open the hood of your car, attach the jumper-cable style clamps onto the battery, and start the engine. In order to get the power it needs, it draws energy directly from your car’s engine. This pump can draw up to 20 amps of power when it’s turned on which is double the maximum power draw of the other portable air compressors we reviewed. The heavier design doesn’t affect the compactness of the pump, and at just 9.8 inches long, 3.2 inches wide and 6.5 inches high, it doesn’t take up much room in your trunk or storage shelves.
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