We really needed this test to be as scientific as possible, which meant eliminating as many variables as we could. The best filters are the ones that had the highest flow and the least restriction, but we also took filtration into account, as while all filters give good filtration, it is widely accepted that cotton gauze filters filter dirt the best, followed by foam filters, and finally metal filters. At each of these, we recorded the pressure increase and plotted these points on a graph to give a visual representation of how the restriction of the filter increases with airflow, therefore allowing a direct comparison between filters. To test the filters, we fitted them to the rig and increased the flow rate at measured increments. We could then compare the data acquired when we tested the filters to get a more accurate performance figure. Before we began, we tested the rig and measured the pressure losses created by the rig itself. The restriction test we came up with was quite straightforward. One thing is certain, though – not all air filters are the same, so we decided to compare a few. In terms of restriction, running no air filter is always going to be the least restrictive option, but this will allow damaging dirt and debris in, too, significantly reducing the engine’s life.įor this reason, a good performance air filter needs to find that perfect compromise of balancing filtration against airflow. Picking the right air filter can be tough, so we’ve put together a handy guide to the best car air filter in 2023.Īn air filter’s primary function is to prevent dirt and debris from getting into the inlet system and causing any damage. Fitting a less restrictive air filter will allow more air in, therefore giving potential for increased power. As the filter is the first part of the inlet system, the amount of air it allows to enter the engine has a direct correlation with how much horsepower the engine can potentially produce. Join us for our performance car air filter test, as we test six aftermarket cone filters to see which flows the best!įitting a performance air filter is usually one of the first upgrades you will make in the search for increased power.
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