Yes, the aftermarket performance air filters do work. 20-60 mph happened in 8.81 seconds, and 45-60 mph took 3.49 seconds. The K&N was, again, the best of the bunch. The CarQuest filter registered a 20-60 mph sprint of 8.91 seconds and a 45-60 mph time of 3.56 seconds. While the dirty and new OEM filters were nearly identical in their sprints (9.01 seconds from 20-60 mph and 3.61 seconds from 45-60 mph), the aftermarket air filters improved on that performance. The latter is to show any top-end performance gains. Jason measured the 20-60 mph sprint and the 45-60 mph sprint. With the data on hand, do the minor performance increases from the aftermarket filters stack up in the real world? In short, yes. The Crosstrek produced 164.3 hp and 142.5 lb-ft of torque. The aftermarket filter made more power, but Fenske wondered if it's also actually filtering less in general.įinally, the K&N air filter promises to deliver more horsepower.and it did. Moving along, the CarQuest filter helped the Crosstrek produce 163.3 hp and 140 lb-ft of torque. Minor increases with a clean filter, to say the least. This may set a DTC and cause the check engine light to illuminate.Next up was the clean OEM filter and the car returned 160.1 hp and 137.4 lb-ft. The use of either type of replacement filter may also increase turbulence of the intake charge, causing fluctuating airflow readings from the MAF sensor. Many popular cotton gauze filters are unable to effectively filter particles below approximately 22 microns. It has been determined that most engine wear is caused by particulates between 10 and 20 microns in size. Additionally, the cotton gauze’s filtration properties are not as good as paper or foam, especially when new/clean.
Travel is reduced, negating much of the claimed advantage. While the media itself flows more when clean, the area through which the air may The Honda Ridgeline club (most recently) performed tests comparing a Delco pleated paper filter. Aftermarket drop-in replacement filters often have fewer pleats or folds, reducing the overall surface area available for filtration. Many tests have proven the K&N filters to be a VERY POOR choice. While there is some evidence of possible engine damage, I also believe that is also very small and unlikely, except for cars with MAFs Just a little too much oil on the filter and by by MAF.ĭrop-in/direct replacement filter is generally less problematic due to the retention of the factory airbox and intake tubing, but problems may arise if the filter panel does not fit as well as the OEM panel. Very little gain in power, maybe even a little loss, no gain in mileage. Your Focus was designed front to back with fuel economy in mind, and the engineers have already compensated for the flow restriction caused by the paper filter- chances are the engine won’t need the extra air the K&N will flow through. Older cars had more MPG’s up for grabs, since design was more of a hodge-podge than it is now and fuel economy was only a minor concern. harder an engine has to work to suck air through the intake tubes and air filter.
On a new car, I wouldn’t do it because even though K&N claims they don’t void the warranty, if you have engine problems and they find out you’ve been using a K&N, they will defintely try to claim that it was the issue and that it’s your fault.Īlso, it is probably less likely that you will find any significant improvement on a newer car. Do K&N Air Filters Come Pre-Oiled Or Must They Be Oiled Before Using. It’s been pretty well demonstrated that K&N’s filter somewhat less well than a paper filter, but it’s less clear if that’s a serious problem- if anything, it’s a matter of miles being skimmed off the end of an engine’s life and it would be very difficult to quantify what effect, if any, the air filter would have had.
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