Why Removing Charcoal Air Filters Is Generally A Bad Idea
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Will removing a charcoal air filter increase horsepower? Charcoal filters are designed to capture hydrocarbons that may escape out your intake when your car is shut off. They’re located after the air filter in your intake duct, and can restrict airflow. But how much effect do they really have on performance? I took two air filters, an OE filter and a performance filter, to the test, with and without the charcoal air filter. To measure the differences in horsepower and torque, each of the four filter options was put on a Mustang dynamometer, with multiple runs. A VBOX was used to measure real world acceleration differences. How much of a difference does a charcoal filter make? Check out the video to find out!

Related Videos:
Do Performance Air Filters Actually Work - automobilrevue.net/v/R1M2OW93WHBHZFk

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    • Lee Smith
      Lee Smith

      Smaller engines have smaller gains or benefit from high flow filters.. Larger horsepower vehicles have much lager gain in power of 10 horsepower or more.. but results are basically based on an average of power the engine is capable of in the first place. A high flow filter isn't going to turn your Nissan 1.8l Sentra into rocket.

      about 1 day ago
    • Thai Nguyen
      Thai Nguyen

      id like to know what kind of compensation you are using for the dyno... subaru's website says that its 148hp... where did you come up with the extra 12hp?

      about 2 days ago
    • Christian Sy
      Christian Sy

      Thanks brother for this detailed explanation!!

      about 6 days ago
    • Erik Myers
      Erik Myers

      Any flow obstruction before the throttle body changes the effective air pressure before the throttle plate. At steady state it is effectively atmospheric pressure, yes. But during transient response to the throttle opening, airflow IS affected by upstream intake restrictions like piping, air filters and potentially even the geometry of the inlet (if the piping is short enough for that to matter).

      This happens regardless of the throttle actuation method, unless the car were to be equipped with pre- and post-throttle pressure transducers that were used to dynamically remap the throttle actuator to provide the same exact driving experience across a variety of conditions. This sounded absurd in my head, but after typing it I can actually envision a horrible future in which cars are mandated and restricted by such technology.

      And now I just typed it into Google . . . .

      about 7 days ago
    • Erik Myers
      Erik Myers In reply to Erik Myers

      I mean to say that reducing the intake restriction effectively "hacks" the throttle mapping to make it more aggressive. Even if the car didn't make more power.

      about 7 days ago
    • Tony Smith
      Tony Smith

      So these performance filters is not so much about engine performance, but the fact that they can be reused.

      about 11 days ago
    • Michael Martinez
      Michael Martinez

      The charcoal filters are for interior in the ac system. To kill any bad smells, originally. I guess now for hydrocarbons.....

      about 19 days ago
    • mike holley
      mike holley

      5hp for 50 bucks is insane. standard is 100$ per hp. that is a super restrictive intake system on that car. the results are atypical.

      about 19 days ago
    • dent tech
      dent tech

      Some people change filters/intakes for mpg's. I'd like to see that tested between all the combinations. That would be a lot of driving, but I'm actually serious

      about 23 days ago
    • Chase Meyermann
      Chase Meyermann

      Would they know it was removed? Would it be measurable?

      about 24 days ago
    • Jeremy Mann
      Jeremy Mann

      Do you have a video comparing twin, compound and sequential turbo setups? If not I think that'd be a good next video

      about 24 days ago
    • Assimilator1

      I'm in the UK & have worked as a car mechanic here for years, I have never seen an intake charcoal filter (currently working for Suzuki, 6yrs prior I was working at indie garages).
      Maybe it's a US thing?

      about 1 month ago
    • GibEC

      didn't the oem lose to the k and n filter on our  other  video? now there is likeno difference?

      about 1 month ago
    • Nick Hahn
      Nick Hahn

      Lets see how it affects fuel economy? Like a week to week test ?

      Also, will any codes maybe get thrown?
      Check engine lights ?

      In a hybrid car I imagine you would notice the fuel smell a little more often.

      about 1 month ago
    • LimitedGunnerGM

      So, the bigger advantage of the oiled filter with no charcoal is the lack of replacement cost over time.

      Minimal fuel economy benefits?

      about 1 month ago
    • John Bergman
      John Bergman

      is there a turbo kit available for 2015 crosstrek XV ?

      about 2 months ago
    • Max Cohagen
      Max Cohagen

      ummm, what if the perf. filter is dirty? 😂

      about 2 months ago
    • wyocoyote wyocoyote
      wyocoyote wyocoyote

      Awesome informative video.

      about 2 months ago
    • jackson7177

      So basically your saying your car well be faster ok got it. LMAO!!!

      about 2 months ago
    • Dan Griffin
      Dan Griffin

      This is wild, would've never thought 7 hp realistic from K&N filter + coal removal, very cool.

      about 2 months ago
    • Lorenzo Samuel
      Lorenzo Samuel

      Also @engineeringexplained, with modern cars would you agree they tuned the car to work from factory with the OEM stock parts. Hence why most people reflash/ retune the ecm for more power once they added the mod vs older cars where the restrictions were introduced after the engine was made to produce power effectively reducing it's output to meet the requirements?

      about 2 months ago
    • Aerick

      Hey dude, love ur videos... Just had a quick suggestion for you. Have you ever heard of or tested BG products? I'm a service advisor at a mechanic shop here n Houston, and we service and specialize only foreign cars. Mainly bmw, Mercedes, Audi.. But all the rest as well.. Anywho, we use these BG products that are quite expensive during some of our maintenance intervals.. And apparently I hear nothing but awesome and amazing praise about it. Now I'm a bit of a penny pincher and don't like to spend , even when I should..lol but I've been realllly wanting to try this out in my vw. Due to knowing about the common carbon build up problem these cars have... Was just curious if you ever used them or heard about it.. Bg MOA, EPR & 44K. Are the main products we use.. Love to see a video on that !

      about 2 months ago
    • C Testa
      C Testa

      I actually gain 5 whp and lb/ft from getting the charcoal filter out and an AEM filter in my 2.0 mazda3 OMEGALOL

      about 2 months ago
    • Huide Y
      Huide Y

      will with the carbon filter can help to get better quality intake air (cleaner?) which can protect the engine for running longer time?

      about 2 months ago
    • Jonathan Brown
      Jonathan Brown

      I've got a 2019 manual Crosstrek, you cant feel much power kick in unless your around 3000rpm, there is a flat scoop for the intake up by the grill, Its held on by two plastic tabs that can be carefully removed with a flathead, that alone constricted so much airflow and made all the difference. On most cars cold air intakes probably wouldn't do a hole lot but you could actually gain some serious horsepower with a Crosstrek this engine is being suffocated, especially if you were to get a professional ecu Flash. Could probably push close to 200hp without a turbo. Going to need to rip that PZEV badge off the back though

      about 2 months ago
    • Sir William Goes
      Sir William Goes

      Good video thanks. You should rest mpg with and without the filter

      about 2 months ago
    • Mark Dejong
      Mark Dejong

      how do you get more rear wheel horsepower and torque on the stock dyno run than the stock Subaru specs rated for at the crank?  148 HP/145 Torque stock specs?

      about 2 months ago
    • Marce Z
      Marce Z

      Personally i want the high performance filter because it's washable, and the prices they charge for one use filters where I live is ridiculous

      about 2 months ago
    • Jonathan

      Don’t charcoal filters expire? And it collects emissions so they don’t end up in the atmosphere but where do they end up when the car is junked?

      about 2 months ago
    • Dave Slingbart
      Dave Slingbart

      You didn't do the ZERO filters test.

      about 2 months ago
    • Mauricio Aceves
      Mauricio Aceves

      i thought the point of these was to smooth out air flow over the maf sensor

      about 2 months ago