Quantcast

K&N Airfilters and gas mileage?

Discussion in 'The Lounge' started by jcook90, Feb 11, 2008.

  1. jcook90

    jcook90 Turbo Monkey

    Rep/Likes:
    3 / 0
    Joined:
    Mar 3, 2006
    Messages:
    1,211
    Location:
    Connecticut
    Anyone got one? Their website claims that they boost gas mileage by straightening the airflow, which makes sense, I was just wondering what the real-world gains are
     

    Please register to disable this ad.

  2. BurlyShirley

    BurlyShirley Rex Grossman Will Rise Again

    Rep/Likes:
    6 / 1
    Joined:
    Jul 4, 2002
    Messages:
    19,210
    Location:
    TN
    My HondaCRF50 performed much better with a K&N than stock.
     
  3. johnbryanpeters

    Rep/Likes:
    245 / 2,729
    Joined:
    Sep 27, 2001
    Messages:
    25,025
    Location:
    Making moss sad in New Haven, Vermont
    At the expense of engine life, I believe.
     
  4. drkenan

    drkenan anti-dentite

    Rep/Likes:
    5 / 0
    Joined:
    Oct 1, 2006
    Messages:
    3,455
    Location:
    west asheville
    Not even noticeable on my Audi.
     
  5. ultraNoob

    ultraNoob Yoshinoya Destroyer

    Rep/Likes:
    0 / 1
    Joined:
    Jan 20, 2007
    Messages:
    4,526
    Location:
    Hills of Paradise
    Actually lost mileage in my Gf's car. A couple of things happened too.
    1: Oil from the filter built up on the intake air temp sensor causing incorrect data sent to the computer
    2: Throttle bore and throttle plate got dirtier faster (dirt sticks to oil from filter)
    3: Reduced fuel economy... my theory below
    As more air is introduced into the motor, the ECU (engine control unit) by way of the oxygen sensors, will sense a leaner air/fuel ratio. It will then respond by adding more fuel (keeping fuel injectors open longer) to maintain it's desired air/fuel ratio. Power will slightly increase and should only manifest itself at WOT (wide open throttle).

    Edit: Most washable air filters will allow more air into your engine, but as a trade off it will also allow more dirt to get in as well. More dirt into your engine = reduced engine life
     
  6. BMXman

    BMXman I wish I was Canadian

    Rep/Likes:
    6 / 0
    Joined:
    Sep 8, 2001
    Messages:
    13,854
    Location:
    Victoria, BC
  7. BMXman

    BMXman I wish I was Canadian

    Rep/Likes:
    6 / 0
    Joined:
    Sep 8, 2001
    Messages:
    13,854
    Location:
    Victoria, BC
    oh and BTW...a good air intake will improve gas mileage but you have to buy the right one for your car...D
     
  8. jdcamb

    jdcamb Tool Time!

    Rep/Likes:
    255 / 2,681
    Joined:
    Feb 17, 2002
    Messages:
    15,428
    Location:
    Nowhere Man!
    Lookup MAF sensors and K&N airfilters in any lameass car forum. Then adjust your risk/2/reward factor....
     
  9. ultraNoob

    ultraNoob Yoshinoya Destroyer

    Rep/Likes:
    0 / 1
    Joined:
    Jan 20, 2007
    Messages:
    4,526
    Location:
    Hills of Paradise
    If you get a complete INTAKE system, then maybe; but just replacing your paper air filter with an K&N (or whatever) will most likely will not.
     
  10. BMXman

    BMXman I wish I was Canadian

    Rep/Likes:
    6 / 0
    Joined:
    Sep 8, 2001
    Messages:
    13,854
    Location:
    Victoria, BC

    not true!...D
     
  11. jcook90

    jcook90 Turbo Monkey

    Rep/Likes:
    3 / 0
    Joined:
    Mar 3, 2006
    Messages:
    1,211
    Location:
    Connecticut
    Yeah I meant intake, not just filter. Guess I'll pass, thanks anyway though
     
  12. DirtyMike

    DirtyMike Turbo Fluffer

    Rep/Likes:
    59 / 711
    Joined:
    Aug 8, 2005
    Messages:
    14,159
    Location:
    My own world inside my head
    This is actually a true statement. If you dont change the resitrictive nature of the cars Intake system with the use of Baffles fopr sound reduction and such, you dont get any inprovement with the airfilter itself, And then even with the entire system, you dont see a Major Improvement untill you flash the PCM to match the now added amount of air, until you do so the vehicle, fuel injection anyways, will run lean, which in turn will raise cylinder temps, raise NOx emissions, and wear your engine faster.
     
  13. N8 v2.0

    N8 v2.0 Not the sharpest tool in the shed

    Rep/Likes:
    18 / 149
    Joined:
    Oct 18, 2002
    Messages:
    11,008
    Location:
    The Cleft of Venus
  14. stevew

    stevew unique white person

    Rep/Likes:
    249 / 2,372
    Joined:
    Sep 21, 2001
    Messages:
    31,547
    My brothers Dodge performs much better with a filter from a Volvo semi.

    Improved mileage/less lag.
     
  15. loco-gringo

    loco-gringo Crusading Clamp Monkey

    Rep/Likes:
    5 / 5
    Joined:
    Sep 27, 2006
    Messages:
    8,894
    Location:
    Deep in the heart of TEXAS
    Perhaps I'm wrong, but any industrial duty filter (ie - well made), like Wix and the like will improve things. OEM filters usually won't.
     
  16. jimmydean

    jimmydean The Official Meat of Ridemonkey

    Rep/Likes:
    175 / 1,551
    Joined:
    Sep 10, 2001
    Messages:
    29,111
    Location:
    Portland, OR
    Filters are for the weak. My redneck truck didn't have a filter at all because that's how I roll.
     
  17. loco-gringo

    loco-gringo Crusading Clamp Monkey

    Rep/Likes:
    5 / 5
    Joined:
    Sep 27, 2006
    Messages:
    8,894
    Location:
    Deep in the heart of TEXAS
    Did you use a rag or a coke can for a gas cap???
     
  18. Austin Bike

    Austin Bike Turbo Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Jan 26, 2003
    Messages:
    1,560
    Location:
    Duh, Austin
    Rednecks don't need gas caps, they don't worry about gas evaporation because their buddy bush has supplied us all with cheap gas. Remember that?
     
  19. stevew

    stevew unique white person

    Rep/Likes:
    249 / 2,372
    Joined:
    Sep 21, 2001
    Messages:
    31,547
    I honestly have no idea.
     
  20. eaterofdog

    eaterofdog ass grabber

    Rep/Likes:
    12 / 22
    Joined:
    Sep 8, 2006
    Messages:
    6,914
    Location:
    Central Florida
    Not much difference in the gas mileage. They will give you more power on the top end, but they need to be washed and oiled monthly, which is a pain in the rear. If you don't, you will be getting dirt in your motor.
     
  21. Upgr8r

    Upgr8r High Priest or maybe Jedi Master

    Rep/Likes:
    0 / 0
    Joined:
    May 2, 2006
    Messages:
    944
    Location:
    Ventura, CA
    I tried one on my 2005 Dodge Dakota V8. Initially, it increased power (slightly) but didn't do a thing for gas mileage. As the filter got dirty, which it did rather quickly, the performance and mileage statred dropping steadily. The cleaning procedure is such a pain in the rear that I gave up on K & M and went back to a stock filter. I'd rather find a high quality paper filter.

    My advice based on experiance is DON'T DO IT. It's not worth it