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DIY: Secondary Air Filter Removal

Discussion in 'Performance and Tuning' started by 007Tacoma, Jul 7, 2007.

  1. Mar 21, 2013 at 5:31 PM
    #561
    worthywads

    worthywads Well-Known Member

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    No it doesn't, but it is rather pointless, and in many states you could fail emissions.
     
  2. Mar 22, 2013 at 8:36 AM
    #562
    piglett

    piglett Member

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    ok my 01 tacoma doesn't have one
    also no sign that there was ever one there
     
  3. Mar 22, 2013 at 7:43 PM
    #563
    Rich91710

    Rich91710 Well-Known Member

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    My '03 Tundra had one.
    Wife's '04 Rav4 doesn't.
     
  4. Mar 24, 2013 at 4:13 AM
    #564
    joedelli

    joedelli Member

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    My truck does have one. I removed it for inspection and found it to be distorted, "charcoal" element had settled and the vacuum from the engine was trying to suck the screen/gauze into the engine. I will get a replacement filter. However, with the charcoal filter gone, a KN installed and tonneau, I get consistently 20 mpg all around and better throttle response. BTW the KN does work (the paper filer is too restrictive. The tonneau makes sense as well (before, its like dragging an anchor, and it worked on my Dakota). I probably can't ask more from this truck as is. Its a daily driver 52 R/T and my fun off roader.
     
  5. Mar 24, 2013 at 10:15 AM
    #565
    Rich91710

    Rich91710 Well-Known Member

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    You have absolutely no flowbench data to back that up.

    I'm getting 24mpg on the OEM filter.
     
  6. Mar 24, 2013 at 10:54 AM
    #566
    worthywads

    worthywads Well-Known Member

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    I continue to get great mpg with a OEM with 40K on it. I'll change it at 60K.
     
  7. Mar 24, 2013 at 10:59 AM
    #567
    Rich91710

    Rich91710 Well-Known Member

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    Bingo.

    The K&N does flow "better" than stock, but to say that the stock filter is "too restrictive" is submitting to K&N marketing hype.
    And even Amsoil admits that their washable filters (AFE) do not filter as well as OEM.
     
  8. Apr 10, 2013 at 8:55 PM
    #568
    EatMyTacomaDust

    EatMyTacomaDust Well-Known Member

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    Ok. Thanks to Rich & Worthywads I'm NOT doing this mod, slightly interested before - slightly, but now after hearing some logical info on the subject - I think not.

    Thanks guys - Rich, Love your Truck - very tasteful, classy, and economical.

    Question though: Can you point me to the info about AFE saying their filters aren't as good as OEM? Just curious cause I just bought an AFE based on all the damn hype on these forums. I've been running OEM air filter now for 30k miles.
     
  9. Apr 10, 2013 at 9:35 PM
    #569
    Rich91710

    Rich91710 Well-Known Member

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    Interesting... Amsoil (AFE) seems to have modified their marketing and is now claiming significantly better filtration than cellulose.

    But here's some real-world test results of several filters:
    http://www.bobistheoilguy.com/airfilter/airtest3.htm

    Also interesting, related to the "how much is 'good enough' question:
    http://www.bobistheoilguy.com/airfilter/airtest2.htm
    "Best" was the K&N at 0.231psi
    "Worst" was Napa paper at 0.249psi.

    Having a hard time finding the charts that used to be posted.
    I found one that showed the Amsoil to be equal to quality cellulose, but it appears to be referring to the 2-stage foam filter.

    Anyways, a couple of years ago, Amsoil's marketing materials included a very good chart comparing 5 or 6 filters, including K&N, AC Delco, foam, and a couple of other "paper" filters.
    The graphs showed the "paper" (cellulose) being the most restrictive, but the best filtration. The Amsoil (AFE) came in below paper on filtration, but significantly higher than K&N... but with marginally better flow than K&N.

    Could be that those charts were removed because Delco wasn't happy about it? I don't know.
     
  10. Apr 11, 2013 at 6:14 AM
    #570
    piglett

    piglett Member

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    there is a difference between how well something flows & how well it filters. removing the filter all together will give the best flow but no filtering. so which one are we after???
     
  11. Apr 11, 2013 at 9:22 PM
    #571
    RELLIM

    RELLIM Well-Known Member

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    Scan Gauge II, AFE air filter, charcoal intake filter delete Fitch Fuel Catalyst, Alpine iDA-X303, AMS OIL (ENGINE) Bilstein 5100 RHA series
    So.. What's better for fuel mileage? More or less flow? This whole filter thing gives me
    a headache. I want good fuel mileage but don't want to be confined to paved roads.
    I really don't like k and n, filters. They are a pain in the ass to clean and oil.
    I like foam filters, they have been used for years on the track, only problem is I can't find one that fits as a drop in filter. There is one made by Blue Monkey I believe.. Not positive..
    Im not sure I'll upgrade to a cold air intake, to many problems with not enough choices of piggy back tuners.
     
  12. Apr 11, 2013 at 11:10 PM
    #572
    Rich91710

    Rich91710 Well-Known Member

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    Given the minimal difference in flow....
     
  13. Apr 15, 2013 at 9:30 PM
    #573
    EatMyTacomaDust

    EatMyTacomaDust Well-Known Member

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    Well after installing my AFE yesterday and comparing it to my OEM Denso Air Filter, I can see the difference. Yes the AFE will give better performance due to less air restriction, not a significant difference though. I mean, If I didn't know i had changed air filters, I wouldn't know - ya know?

    I'm going back to OEM after I use this AFE for a while. The OEM Denso is literally 3 - 4 times thicker in my opinion. I'm looking the for best filtration, I'm not worried about performance, if I was, I wouldn't be driving a 2.7L or even a 4.0L 6 for that matter.

    Conclusion - Stick with OEM Denso Air Filter. Thanks for the links. Good tests, I've been to BTOG's site a few years back. . . Bums me out about the Napa results. I did a ton of research after I bought my Tacoma regarding which Oil Filter to use and I came to the conclusion that the Napa Gold by WIX was the best / and easily available. . .

    Not falling for the AMSoil hype anymore though. I've been using it since my truck was new. Just changed my oil on Sunday after 5700 miles - hate going that long but it was the first chance I've had to get to it - 5700 MILES - AMSOIL was JET BLACK. This is the AMSoil that claims 25k between Oil Changes - Well I'm calling BULLSHIT!

    Done with it, switching to Mobil One, at least I'll save $2 / Quart.
     
  14. Apr 15, 2013 at 9:51 PM
    #574
    Rich91710

    Rich91710 Well-Known Member

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    A lot of the perceived performance difference, especially with CAI units, it the noise.
    The engine sounds like it's making more power, and added power actually felt is mostly from the throttle being mashed a bit more.

    Drive normally wearing a pair of earplugs and the difference won't be so pronounced, as you saw with the replacement filter in the OEM box.
     
  15. May 23, 2013 at 6:26 PM
    #575
    Fryguy

    Fryguy New Member

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    Going to do this right now!!
     
  16. May 28, 2013 at 9:33 PM
    #576
    TacoTruckDriver

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    That filter has to eventually go bad. Are there any after market upper-air boxes? I have not been successful in finding any online that look like they fit.
     
  17. May 28, 2013 at 9:48 PM
    #577
    Rich91710

    Rich91710 Well-Known Member

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    It's not a filter, so it won't go bad.

    It is a sack of activated charcoal pellets and it captures fuel vapors that come back out of the throttle body after the engine is shut down.
    When the engine is restarted, the fresh air pulls the captured hydrocarbons from the charcoal.

    As long as the air filter is changed regularly and not replaced with an oiled element, the secondary mesh will last the life of three Tacomas, just like the charcoal canister in the evaporative control system on the fuel tank.
     
  18. Jun 17, 2013 at 10:09 AM
    #578
    RedDead

    RedDead Well-Known Member

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    if its sole purpose is to capture fuel vapors ..does anyone have an explanation on why removing it effects the 4cyc more than the v6?
     
  19. Jun 17, 2013 at 3:41 PM
    #579
    worthywads

    worthywads Well-Known Member

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    No, just a rumor with no backing.
     
  20. Jun 17, 2013 at 8:38 PM
    #580
    Rich91710

    Rich91710 Well-Known Member

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    It doesn't.

    It's psychological, just like a CAI.
     
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