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2012 air injector with CAI and Headers

Discussion in '2nd Gen. Tacomas (2005-2015)' started by aportis72, May 1, 2012.

  1. May 1, 2012 at 11:05 AM
    #1
    aportis72

    aportis72 [OP] Well-Known Member

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    So I have been doing some thinking.

    The 2012 has the air injector / smog pump to blow hot air into the Cat to make it work faster.

    If I will be running headers and exhaust without Cats could I just remove this?

    If its removed could I also use a 2011 TRD CAI?

    Thoughts?
     
  2. May 1, 2012 at 2:42 PM
    #2
    Commanderwiggin

    Commanderwiggin Well-Known Member

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    Interested as well...
     
  3. May 1, 2012 at 2:44 PM
    #3
    Blasphemous

    Blasphemous Well-Known Member

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    Hmmm... I am interested in an answer for this one.
     
  4. May 1, 2012 at 2:46 PM
    #4
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Removing this would be against federal law. You would probably get a CEL after removing that. Also headers wouldn't compensate for the smog pump.
     
  5. May 1, 2012 at 4:05 PM
    #5
    aportis72

    aportis72 [OP] Well-Known Member

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    It may be against federal law, but in my county In WA state we do not have emission laws. In Skagit county you can legally sell a vehicle without a catalytic converter. Now is it still illegal to remove yes, but how will you get caught. No vehicles are ever emission tested in this county and when I go to sell or even trade in it wont matter.

    And a cel can be avoided with a Sensor Simulator.

    And I though the Smog pump goes into the headers right before the Cat.Thats why UDR had to develop new headers!
     
  6. May 1, 2012 at 4:13 PM
    #6
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Ok what's the benefit of removing the system?

    Also I didn't mean a CEL for the O2 sensor. I bet there is a smog pump status is checked by the ECU.
     
  7. May 1, 2012 at 4:29 PM
    #7
    aportis72

    aportis72 [OP] Well-Known Member

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    I was thinking it provides better flow of exhaust without Cats and reduces weight. My argument to the point of Cats don't restrict flow is why don't track cars or off road trucks and race cars run them then.

    I don't believe the Smog pump has a sensor from what I have seen. But I could be wrong.
     
  8. May 1, 2012 at 4:34 PM
    #8
    whippersnapper02

    whippersnapper02 Well-Known Member

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    The reason race cars don't have cats is because maximum horsepower is wanted. No cats make for great peak numbers. Peak numbers don't help on the street since usually they are at high RPM. Having cats promotes exhaust scavenging at low to mid RPM which makes for more useful power. Low to mid power is especially useful in a truck.
     
  9. May 1, 2012 at 7:47 PM
    #9
    aportis72

    aportis72 [OP] Well-Known Member

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    Cats do not promote HP At all even at low RPM. Cats are there for one reason only to reduce "greenhouse Gasses" thats all I'm supercharged so got as much low end power as I will ever need I want loud great sound forms smooth open path and Cats do not allow for this. The only obstacle I want in the way of my exhaust is the resonator and the windshield of the car behind me.
     
  10. May 1, 2012 at 8:17 PM
    #10
    whippersnapper02

    whippersnapper02 Well-Known Member

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    It has been proven that low to mid range power is reduced when the cats are removed. The DTLT headers lose power until 3000rpm. Not everyone has a supercharger.
     
  11. May 1, 2012 at 9:50 PM
    #11
    aportis72

    aportis72 [OP] Well-Known Member

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    Are there dynos to prove this. Not saying your lying just extremely hard to believe. But again any info on removing the smog injector with removal of cats
     
  12. May 1, 2012 at 9:52 PM
    #12
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Doug Thorley's dyno sheet on their website shows a drop in power until 3000 RPM for their long tube headers. Exhaust isn't about simply throwing on the biggest pipe you can fit.

    Exhaust scavenging is a real thing. Ever seen the expansion chamber on a 2 stroke? It isn't there for looks.
     
  13. May 1, 2012 at 9:58 PM
    #13
    TrdSurgie

    TrdSurgie revised

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    This guy knows.
     
  14. May 1, 2012 at 10:27 PM
    #14
    aportis72

    aportis72 [OP] Well-Known Member

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    This can simply be corrected with more back pressure in theory that's all it takes this can be done in many ways. Adding restictors as in Cats or smaller piping. This is why you can't run a true duel exhaust and why true straight piped runs like shit.

    So Yes you may loose HP at low RPMs but what you gain in higher RPMs makes up for it. The Higher RPMs will create more back pressure creating better HP higher in the RPM range.

    Or take cats off run propped piping and you loose no HP at top or bottem.

    Take cats off replace with proper piping to create correct amount of back pressure and your good.

    Cats are for EPA tree hugging Al Gore loving hippy purposes only an exhaust made to be run without cats will produce more power than a system that has to work around them.
     
  15. May 1, 2012 at 10:36 PM
    #15
    KenLyns

    KenLyns Lord of War

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    So how will you be using your truck? Is it destined for the track? Keeping the revs up in day-to-day use is not desirable.
     
  16. May 1, 2012 at 10:45 PM
    #16
    whippersnapper02

    whippersnapper02 Well-Known Member

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    There is no backpressure in the exhaust. If there was that would be bad. Why go through all the trouble of trying to make the exhaust flow like stock when you can just leave the cats on? The high RPM power is not worth it. You like driving a 4 banger Honda?

    Cats are for treehuggers? That's a derp statement.
     
  17. May 2, 2012 at 2:50 PM
    #17
    aportis72

    aportis72 [OP] Well-Known Member

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    So you are saying that the exhaust system has no pressure in it. The engine requires pressure from the exhaust system to run properly. And why were cats implemented in the first place then?

    Again to the statement above I'm supercharged and want more HP higher in the RPM range
     
  18. May 2, 2012 at 2:58 PM
    #18
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Back pressure is minimal. I believe what is in play is exit velocity but I'm not fluid dynamics expert.

    The cats are there to clean the exhaust.

    What supercharger? A centrifugal supercharger like the URD kit will give more high RPM power. A roots like the TRD makes power in the low to mid RPM range.
     
  19. May 2, 2012 at 3:23 PM
    #19
    BUZZCUT

    BUZZCUT Well-Known Member

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    Hell just cut off the exhaust before the cats and be done with it. Weight savings and the zero back pressure to get the braaaaaaap, braaaaaap you're looking for.
    :spy:
     
  20. May 2, 2012 at 5:30 PM
    #20
    tommyg29

    tommyg29 Well-Known Member

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    The issue is going to be getting the ecu to play nice with your new exhaust setup. Agreed that cats were developed to more efficiently burn exhausts and they are definitely not needed in a racing setup of any kind. If you are willing to invest the time and money you can certainly design an exhaust system that operates more efficiently without cats across the spectrum.
    If youre not going to be racing I would definitely think you should find a way to keep the pump and cats. Probably save you a LOT of trouble.
     
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