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K&N Intake 2.7L 4cyl

Discussion in '4 Cylinder' started by Tacoma4x4banger, Sep 14, 2013.

  1. Sep 14, 2013 at 3:59 PM
    #1
    Tacoma4x4banger

    Tacoma4x4banger [OP] Member

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    265/75-16 BFGoodrich All-Terrain T/A's. Rancho 2.5 inch lift kit w/ Front UCA's and Coilovers, Rear blocks and RS9000XL's.
    Anyone have a K&N intake on there 2.7L? I'm doing some mods and to my 2013 2.7L auto 4x4 and I'm curios if the K&N is really worth it. I'm getting 265/75-16 BFG AT's with 16x8 alloy wheels with the ProComp ProRunner shocks and struts with the 2.5in front height lift adjustment. Will the intake help compensate for the added tire size and weight?
     
  2. Sep 14, 2013 at 9:55 PM
    #2
    bama trd

    bama trd Well-Known Member

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    K&N Cold Air Intake , Plasti-dip Bumpers , Painted tool box , Roll on Bedliner , Blacked out Emblems , Tinted Windows , Aftermarket CD player , Bed Linered Fender Flares
    I purchased my 2003 2.7L x-cab 4x4 with a K&N cold air induction already installed, so I can't compare to what it's like without it. One thing is , I can here that K&N cone filter sucking some air, when I rev.
     
  3. Sep 14, 2013 at 10:55 PM
    #3
    tooter

    tooter play every day

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    2012, std cab, 5 lug, 2.7, 5 speed
    Built for maximum low end torque, tooter II.VII intake manifold spacer, LCE long tube header, Injen long tube intake, 2,900 rpm torque peak.
    With the 2.7, no intake could possibly compensate for the larger diameter and heavier rotating weight of bigger tires. However, gearing your final drive lower would definitely resolve the issue. :)
     
  4. Sep 14, 2013 at 10:58 PM
    #4
    Rich91710

    Rich91710 Well-Known Member

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    Not worth it.
    Makes more noise, so the psychological effect is it makes more power, but it doesn't, and the K&N filter does not filter as well as stock.
     
  5. Sep 14, 2013 at 11:57 PM
    #5
    worthywads

    worthywads Well-Known Member

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  6. Sep 15, 2013 at 8:54 AM
    #6
    Tacoma4x4banger

    Tacoma4x4banger [OP] Member

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    265/75-16 BFGoodrich All-Terrain T/A's. Rancho 2.5 inch lift kit w/ Front UCA's and Coilovers, Rear blocks and RS9000XL's.
    Cool, Thanks guys! I was worried about it possible ingesting water anyways, the open design just seems like it would be more prone to sucking up water. Especially with the amount of rain we have been getting here in Denver. I'll save the money and stick with the stock intake. Gracias Taco Amigos!
     
  7. Sep 15, 2013 at 9:43 AM
    #7
    tooter

    tooter play every day

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    2012, std cab, 5 lug, 2.7, 5 speed
    Built for maximum low end torque, tooter II.VII intake manifold spacer, LCE long tube header, Injen long tube intake, 2,900 rpm torque peak.
    You just offered a very useful piece of information concerning intakes,
    as your drag runs are as valid as dyno test results. :thumbsup:

    I don't think that my Injen intake helped my engine either as the A/F on the dyno runs was really lean. When I removed the stock intake I took some careful measurements and found that the inside diameter of the throttle body bore is exactly 61mm, and the inside diameter of the intake air horn at the other end in the fender well is also exactly 61mm. This 1 to 1 relationship of the intake's entry to throttle body bore must be critical for the ECU to meter a good A/F ratio under full throttle conditions.

    [​IMG]

    So I'm going to make a 61mm inside diameter ring and insert it right at the mouth of the Injen intake to restrict the opening enough to richen up the mixture at wide open throttle. :thumbsup:
     
    Last edited: Sep 15, 2013
  8. Sep 15, 2013 at 7:39 PM
    #8
    chriss

    chriss Well-Known Member

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    Not true. As everyone that has modified their stock airbox can attest, this is not critical. Only the section of the intake that contains the mass air flow sensor is relevant to measurement or mixture ratios.
     
  9. Sep 15, 2013 at 8:01 PM
    #9
    tooter

    tooter play every day

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    2012, std cab, 5 lug, 2.7, 5 speed
    Built for maximum low end torque, tooter II.VII intake manifold spacer, LCE long tube header, Injen long tube intake, 2,900 rpm torque peak.
    I understand what you're saying, as all of aftermarket intakes are restricted in exactly the same way by the required diameter of the MAF sensor.

    My Injen uses oversized tubing and necks down to the proper size right at the MAF sensor...

    [​IMG]

    then returns to the larger diameter until it necks down again right at the throttle body...

    [​IMG]

    However the intake diameter at the air filter end of the tube is quite a bit larger than the stock intake which makes the Injen intake overall less restrictive at wide open throttle. Here's the dyno run A/F chart. In both runs I used exactly the same intake, and as you can see, they're both running way lean.

    [​IMG]




    So I'm going to reduce the opening at the air filter to match the bore of the throttle body exactly like the air horn on the stock intake.
     
    Last edited: Sep 15, 2013
  10. Sep 15, 2013 at 9:34 PM
    #10
    Rich91710

    Rich91710 Well-Known Member

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    Which causes an increase in velocity at the MAF and TB, but the total volume remains unchanged.
    Restricting the tubing at the filter will simply place another velocity change into the system, but will not improve flow.

    If this were a carb'd system and the velocity changes were post-carb, this would be a bad thing because the fuel would drop out of suspension when the tubing flared out beyond the MAF and the velocity dropped.

    In this case, the velocity at the MAF and the velocity through the TB are identical, whether the tubing ahead of the MAF and behind the MAF is 61mm or 610mm. The expanded tubing provides a bit of a buffer... almost acting as a capacitor, so the MAF does not "see" small fluctuations in flow at the TB... enlarging the tubing between the MAF and TB would increase that effect... I'd say with a 70mm tube you'd start seeing some serious mixture issues caused by the capacitive lag between the TB and MAF.

    Adding a restriction ahead of the MAF will only serve to increase the overall restriction of the intake.
    The multiple bends and chambers in the stock snorkel, the ridges in the flexible coupling, and the intersection in the stock resonator chamber introduce more restriction via turbulence than the stock 61mm snorkel inlet diameter.

    The magic is in the flow velocity at the intake port, which you have addressed with the 2" spacer.
     
  11. Sep 17, 2013 at 11:08 AM
    #11
    tooter

    tooter play every day

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    2012, std cab, 5 lug, 2.7, 5 speed
    Built for maximum low end torque, tooter II.VII intake manifold spacer, LCE long tube header, Injen long tube intake, 2,900 rpm torque peak.
    In addition to diameter reduction, flow restriction is also a function of the length of the diameter reduction.

    Ask any plumber which flows better... 10 feet of half inch, or 100 feet of half inch. ;)
     
  12. Sep 17, 2013 at 6:37 PM
    #12
    Rich91710

    Rich91710 Well-Known Member

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    Yup... and that 90 degree bend dropping into the TB "costs" as much as 10ft of straight pipe :D
     
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