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K&N Drop In Filter... 2 MPG LOSS????

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Kuneff, Feb 14, 2011.

  1. Feb 14, 2011 at 10:59 AM
    #1
    Kuneff

    Kuneff [OP] Carpe Diem

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    I have a brand new Tacoma TRD Sport. 6 speed. I drive 90 miles a day to work and home. 80 miles of the trip is Interstate. I set the cruise at 75 most of the time. I do NOT let the truck run/idle for any length of time mre than a couple minutes during the day.

    At 800 miles I was getting 15.7-15.9 mpg out of the truck. So I put the K&N in. I ran 2 tanks of gas through the truck since. The gas milage has dropped to 13.5-13.7.

    WTF? I thought a K&N was supposed to increase gas milage???

    Anyone ever have this experience before? I put the stock filter back in yesterday and I plan to leave it in for a while. Maybe try the K&N again this summer.
     
  2. Feb 14, 2011 at 11:15 AM
    #2
    mjp2

    mjp2 Living vicariously though myself Moderator

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    Pay very close attention to how you drive. After installing an intake most people get heavier on the gas to feel/hear the difference.

    Driving style affects your fuel economy more than any mods you could do to the truck.
     
  3. Feb 14, 2011 at 11:39 AM
    #3
    hetkind

    hetkind Well-Known Member

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    K&N Filters are a mixed lot...sometimes they help, other times...

    The only real way to tell is with a dyno!

    Howard
     
  4. Feb 14, 2011 at 3:12 PM
    #4
    Kuneff

    Kuneff [OP] Carpe Diem

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    I am just after gas milage, no desire to have it on a dyno.

    I just don't understand how an air filter would be so harmful to the milage.
     
  5. Feb 14, 2011 at 3:15 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Did you do the Deck Plate mod yet?
     
  6. Feb 14, 2011 at 3:40 PM
    #6
    2011tacoma4x4

    2011tacoma4x4 Active Member

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    I got the same truck as your, because the engine not brake in, and weather relate, driving habit, heavy moisture in the air, my first 2 tank got average 300 milles, but now it got 340 miles even with mod. the 6 speed is not fuel efficency like auto trany .:)
     
  7. Feb 14, 2011 at 3:41 PM
    #7
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    he's got a TRD sport.....no deckplate mod
     
  8. Feb 14, 2011 at 3:44 PM
    #8
    jgwheeler17

    jgwheeler17 I'm a zit. Get it?

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    first thing that popped in my head when i saw the thread. . . "hey man listen to this, sounds like a turbo winding up when i mat it!" hahaha
     
  9. Feb 14, 2011 at 3:45 PM
    #9
    TacoDawgfan

    TacoDawgfan Hunker Down You Hairy Dawg!

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    I have always been told the bigger the engine the more difference it would make. With that said, I had a Hemi Ram and put one in it. Couldn't tell a difference one way or the other. I did like it for the clean and reuse part though.
     
  10. Feb 14, 2011 at 5:05 PM
    #10
    hetkind

    hetkind Well-Known Member

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    bilstein set at 1.75, Racho 5000 rear with 4 leaf kit, floor mats, high lift jack, pull hook in hitch, bed rail corner braces, severe duty brake pads and devil horns on the grill....
    The dirt loading changes flow on the K&N, such that tuning doesn't hold...an you also have to remember that the engine is tuned to the stock airfilter and box.

    There are EXTENSIVE discussions in the BMW Airhead world on K&N filters...also, I have decades of experience on tuning carbs:)
     
  11. Feb 14, 2011 at 5:44 PM
    #11
    jdtemple

    jdtemple Well-Known Member

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    Did you disconnect the battery for 30 minutes after the install, give the computer time to re-adjust to more airflow.
     
  12. Feb 15, 2011 at 5:55 AM
    #12
    Kuneff

    Kuneff [OP] Carpe Diem

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    Never disconnected the battery. Its just a drop in replacement filter. I have never had to do that on any other car I have owned including my Infiniti's. So I never thought it would be necessary to do that with a truck.

    It's not a matter of me looking for more HP. I really don't care about that. I just wanted the convience of not having to ever buy a new air filter. And I had hopes of increasing my MPG.

    I am just stumped that I lost 2 mpg by switching to a K&N.
     
  13. Feb 15, 2011 at 6:39 AM
    #13
    DEEVON911

    DEEVON911 Semi-Pro

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    I have the K&N drop in and didn't notice a difference either way. I have an automatic, so not sure if that makes a difference.
     
  14. Feb 15, 2011 at 6:49 AM
    #14
    NoDrAmA357HK

    NoDrAmA357HK Well-Known Member

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    Never had a drop in, but I always resetted my ecu by disconnecting the battery and stepping on the gas pedal a few times while disconnected when I installed a short ram or cold air intake.

    *** Try a Negative disconnect OP and see if it makes a difference or atleast gets you back to OEM MPG...
     
  15. Feb 15, 2011 at 7:03 AM
    #15
    Lurkin

    Lurkin Well-Known Member

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    Couple of things that I would try, not necessarily in your preferred order:

    o put the stock filter back in and see if the mpg's go back to normal
    o replace with an AFE Pro-Dry drop-in
    o clean the MAF sensor, K&N might have been over-oiled from the factory
    o reset the ECU (disconnect battery) - I agree that a drop-in should not have a significant enough difference to require it, but what do you have to lose, besides your radio and clock settings :)
     
  16. Feb 15, 2011 at 11:04 AM
    #16
    island808

    island808 Me l've got brains.

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    I was about to mention. The maf, if I'm not mistaken, is a wire uses heat dissipation to divine air flow. an insulator on it will corrupt its data.

    THe original intake is pretty free flowing, but the truck might be touchy, and I haven't heard of anyone that tunes these things.
     
  17. Feb 15, 2011 at 11:14 AM
    #17
    MachoTaco10

    MachoTaco10 Well-Known Member

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    just a tip man, the 6 speed screams at 75mph running like 2800 RPM's drop her down to 70mph and I noticed a 3 mpg improvement consistently. trust me the 5 mph difference aint gonna kill ya, may add max 5 min to your commute.

    also K&N air filters are the most over rated thing made since flowmaster.
     
  18. Feb 15, 2011 at 11:19 AM
    #18
    island808

    island808 Me l've got brains.

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    there's already a spreadsheet someone figured out the MPGs at different speeds. 50 was best I think.. and mpg wend down dramatically after 55.
     
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