1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Cold air intakes? What have you tried?

Discussion in '1st Gen Tundras (2000-2006)' started by jcrob33, May 24, 2020.

  1. Jan 16, 2021 at 1:48 PM
    #31
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Trying to think outside the box here on this. Maybe slightly heat/melt the plastic and then form your custom ‘flare’ on the rim of your existing intake. I’m assuming the ‘flare’ is the magic design detail we are trying to achieve?

    upload_2021-1-16_16-46-32.jpg
    upload_2021-1-16_16-47-0.jpg
     
    Darkness likes this.
  2. Jan 16, 2021 at 2:52 PM
    #32
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
  3. Jan 16, 2021 at 3:34 PM
    #33
    assassin10000

    assassin10000 New Member

    Joined:
    Oct 27, 2020
    Member:
    #54157
    Messages:
    1,866
    First Name:
    Andrew
    Northern CA
    Vehicle:
    '05 SR5 AC
    Remote start alarm Removed keyless entry piezo Qi phone charger & dash mount Subaru underseat subwoofer Hopkins Easylift Steering wheel audio controls No-tenna mod 3/4 adhesive anti-rattle shim D/S door
    The flare is called a velocity stack. It creates smoother airflow and faster movement of air. This improves cylinder filling at both part, instantaneous and wide open throttle.

    https://en.m.wikipedia.org/wiki/Velocity_stack
    Velocity_stack_detail.svg.png

    Anyways, you cannot re-form the current tube without cutting the hole in the inner fender larger to fit it through. Which would somewhat defeat the purpose as I still want to pull only then cooler air outside the engine bay.


    Different shape and it has a larger diameter iirc. 2nd/3rd gens have a different airbox and fender opening.

    s-l500.jpg
     
  4. Jan 16, 2021 at 4:05 PM
    #34
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Either way you’d have to cut the inner fender whether you purchased a new ‘stack’ or you modded the existing one with ‘flares’.

    Porting the inner edge of the intake inside the filter box with a file would also help? Might as well.



    I don’t have the time right now to mess with this, but it doesn’t look too difficult to melt that ABS with a heat gun and flare the edges out using a smooth piece of rounded wood. The flared edges may be flexible enough to fold/bend and stuff into the existing hole without cutting the inner fender. Not sure as I’ve never removed my Air Box.

    The other option is remove the quarter panel and push it in that way. Or, fab up a metal blocking plate and slip it over the enlarged inner fender hole/new intake and tape or caulk it in place against the inner fender for a somewhat clean fitment upon Air Box reinstall.

    While one is at it one could block off those holes and other hot air entires that already exist on our inner fender side panel.

    Question for me is: Is this worth it all? I’m not spending money to find out, but might try this using what I have no money out of pocket style.
    upload_2021-1-16_18-56-3.jpg
     
  5. Jan 16, 2021 at 4:13 PM
    #35
    empty_lord

    empty_lord They see me rollin'

    Joined:
    Feb 1, 2019
    Member:
    #25441
    Messages:
    10,024
    Gender:
    Male
    First Name:
    Dan
    Indiana, Chicagoland
    Vehicle:
    05 rollover special
    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    Seeing that the k&n actually moves the mass airflow sensor it “might” add some performance. Because changing the diameter of the tube the sensors in will trick the maf into reading incorrectly which can mean more power... but I don’t have one to actually see what the difference is
     
    Rica25 likes this.
  6. Jan 16, 2021 at 4:19 PM
    #36
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    I’m going under the assumption that @assassin10000 is trying to find a stack end that fits the existing OEM Air Box set up on the pre-filter intake side. Didn’t realize we are changing tube diameters other than the Stack Tip. I’m confused now. I’ll sit back and learn some more.
     
    Rica25 likes this.
  7. Jan 16, 2021 at 4:21 PM
    #37
    empty_lord

    empty_lord They see me rollin'

    Joined:
    Feb 1, 2019
    Member:
    #25441
    Messages:
    10,024
    Gender:
    Male
    First Name:
    Dan
    Indiana, Chicagoland
    Vehicle:
    05 rollover special
    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    Computer is programmed for the maf to read based off air velocity tuned to the size of the stock tube where the sensor sits. Larger or smaller diameter will make the readings appear incorrect. Which can trick the ecu into adding or removing fuel.
     
  8. Jan 16, 2021 at 4:24 PM
    #38
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Will flaring the just the tip on the Pipe entry trick the ecu? Or, will it just make the air flow more efficient? Or both?

    So, we’d need a tune with a new tip? We can’t tune our trucks ecu I thought?
     
    Rica25 likes this.
  9. Jan 16, 2021 at 4:26 PM
    #39
    empty_lord

    empty_lord They see me rollin'

    Joined:
    Feb 1, 2019
    Member:
    #25441
    Messages:
    10,024
    Gender:
    Male
    First Name:
    Dan
    Indiana, Chicagoland
    Vehicle:
    05 rollover special
    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    Anything before the sensor won’t mess with readings, but you will get smoother airflow which may help a bit
     
  10. Jan 16, 2021 at 4:29 PM
    #40
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    This sounds plausible. Smoother flow helps anything. I’ll sit back and watch and maybe tinker in a few weeks.
     
    Rica25 likes this.
  11. Jan 16, 2021 at 5:11 PM
    #41
    assassin10000

    assassin10000 New Member

    Joined:
    Oct 27, 2020
    Member:
    #54157
    Messages:
    1,866
    First Name:
    Andrew
    Northern CA
    Vehicle:
    '05 SR5 AC
    Remote start alarm Removed keyless entry piezo Qi phone charger & dash mount Subaru underseat subwoofer Hopkins Easylift Steering wheel audio controls No-tenna mod 3/4 adhesive anti-rattle shim D/S door
    Ah, but here's the trick with the TRD 'air accelerator'. As I am to understand it's flexible (rubber I think). I'm hoping it will both compress to fit through the existing hole and form to the airbox inlet shape.


    Yeah, it may be possible to reform the airbox but abs plastic becomes even more brittle when reheated and reshaped iirc.


    Correct. I'm just interested in adding better flow into the airbox currently.

    ^ This is what he was getting at talking about CAI and the K&N setup specifically. Not what I was doing.

    No trick to adding a velocity stack to the entry of the airbox (or on flaring it). It just adds a little more efficiency.

    The maf/tube diameter at the top of the airbox hasn't changed, so the stock tune (fuel tables) still apply. No change to the accuracy of airflow readings.

    So no tune or retune necessary.

    This is the goal.

    The 1st gen Tundra airbox is near the same inlet size as the 4th gen 4runner with a larger engine. Increased flow to the airbox may help a bit more on our 4.7L than the smaller 4.0L. That's my current thoughts on this.

    I'm also looking at a drop in filter to go along with this. Leaning towards the AFE Pro S washable dry filter. ;)

    That and maybe some 12 hole injectors too. :eek2:
     
  12. Jan 16, 2021 at 6:52 PM
    #42
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    The K&N plays tricks in a few ways.
    1) maf is further up the tube vs being right off the box.
    2) maf has a little foam spacer that pushes it out of the pipe a bit.
    3) the opening of the tube within the filter is slightly smaller than the stock tube if I remember right, but the tube gets a bit fatter as it gets toward the maf.

    I'm not sure which airboxes you guys are eyeballing, my Tundra box looks like this. I hacked the end off the tube long ago and just left the part that pokes through the fender. Measures right at 3" ID
    20210116_183947.jpg

    The rib with the foam is what presses against the fender. Option A is to fit a velocity stack onto this part of the pipe. Option B is to remove this section of pipe completely and run the biggest pipe possible into the box with a velocity stack on the end (in the fender). You would need to peel back the inner fender to attach that pipe, I don't have any inner fender to worry about.
    20210116_183957.jpg
    Freshly trimmed nails for the amateur hand modeling points.
     
  13. Jan 16, 2021 at 6:54 PM
    #43
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    That AFE is pretty damn good quality. I also really like the AEM dry filter (K&N is the parent company but AEM are better). I have an Airaid filter and its pretty badly designed, less filter surface area than stock.
     
    Glock 40 likes this.
  14. Jan 16, 2021 at 9:30 PM
    #44
    assassin10000

    assassin10000 New Member

    Joined:
    Oct 27, 2020
    Member:
    #54157
    Messages:
    1,866
    First Name:
    Andrew
    Northern CA
    Vehicle:
    '05 SR5 AC
    Remote start alarm Removed keyless entry piezo Qi phone charger & dash mount Subaru underseat subwoofer Hopkins Easylift Steering wheel audio controls No-tenna mod 3/4 adhesive anti-rattle shim D/S door
    If the spot the MAF is in is the same diameter as the OEM airbox, it should read the same. It doesn't matter if it's closer or further from the filter. The foam spacer may just be their seal/gasket.

    The only reason I can think they probably moved it further away, is the airflow may be more turbulent from the cone filter vs the panel filter, which can cause odd issues to occur.



    Looks like your airbox is different than mine. Mine has that odd shape and is a little larger works out to about 3.5-3.75" I.D. vs your 3" I.D.

    Perhaps a non-VVT-i vs VVT-i difference?


     
  15. Jan 16, 2021 at 9:37 PM
    #45
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    What if vvt-i is a fraud and Toyota just made the intake bigger :rofl:

    The K&N lifts the sensor and seems intentional. Aside from the foam, which does seal in place of the o ring, the pad where the maf mounts is a bit elevated. I'll maybe get it down off the shelf to get some pics this week.
     
  16. Jan 17, 2021 at 6:03 AM
    #46
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
  17. Jan 17, 2021 at 7:39 AM
    #47
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    I drew inspiration from watching swimsuit models arching their backs on the beach.
     
  18. Jan 17, 2021 at 7:44 AM
    #48
    FrenchToasty

    FrenchToasty The Desert rat, 6 lug enthusiast

    Joined:
    Sep 15, 2019
    Member:
    #36156
    Messages:
    15,435
    First Name:
    Mo
    The SoAz
    Vehicle:
    2006 DC 4.88s Elocker and some other trippy stuff
    None
    The ol Nantucket finger arch
     
    des2mtn, mtntop, Rica25 and 2 others like this.
  19. Jan 17, 2021 at 10:41 AM
    #49
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Took a peek a do down through the inner fender holes. The 2002 has a shape like this.

    upload_2021-1-17_13-40-37.jpg
     
    FrenchToasty likes this.
  20. Jan 17, 2021 at 3:36 PM
    #50
    assassin10000

    assassin10000 New Member

    Joined:
    Oct 27, 2020
    Member:
    #54157
    Messages:
    1,866
    First Name:
    Andrew
    Northern CA
    Vehicle:
    '05 SR5 AC
    Remote start alarm Removed keyless entry piezo Qi phone charger & dash mount Subaru underseat subwoofer Hopkins Easylift Steering wheel audio controls No-tenna mod 3/4 adhesive anti-rattle shim D/S door
    Here's a few pics off a '00 that still had the lower part of the airbox at the junkyard.

    IMG_20210117_130145.jpg
    IMG_20210117_130131.jpg


    Not applicable to me but may help someone else out.



    Anyone fitted a filter minder on their truck and how long until you needed a filter? They also come on the fancy TRD intakes.
     
    Last edited: Jan 17, 2021
  21. Jan 17, 2021 at 4:36 PM
    #51
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    That, from what I could see via the holes on 2002, is what mine looks like.
     
    Rica25 likes this.
  22. Jan 18, 2021 at 12:40 AM
    #52
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    Yup. Thats what mine looked like before I circumcised it. No idea why Toyota aims them backwards, as if you'll need ram air when hitting reverse. :D
     
    Clintotron likes this.
  23. Jan 18, 2021 at 6:46 AM
    #53
    KNABORES

    KNABORES Sarcasm incoming

    Joined:
    Jan 1, 2020
    Member:
    #40572
    Messages:
    8,916
    Gender:
    Male
    Arkansas
    Vehicle:
    2000 Limited TRD AC 4X4 Thunder Grey 270k miles. 2019 Limited TRD CM 4x4 Cement Grey 75k miles
    2000: Bilstein 5100's 16x8 589's with 265/75/16 and 1.25" spacers Flowmaster 50 series over the axle dump Pioneer touchscreen with backup camera Full interior and dash LED conversion Trailer brake controller with 7 pin Bedliner coat bumpers & trim ARE topper 2019: ARE topper with full Bedrug kit and Vortex rack TRD shifter 1.25" wheel spacers (I like to live dangerously) Red tow hooks for that +15 grip bonus
    Factory shape is likely to keep it quiet and keep dirt and water out. Not much performance to be gained here that doesn't sacrifice the ability to do it's job, which is filter contaminants out before they get to the motor. The fact that a million mile example of this motor exists (2 in fact) points to the factory design being effective. I'll be leaving mine stock as I have no plans to replace this vehicle. Ever.
     
    onesojourner, Clintotron and Glock 40 like this.
  24. Jan 18, 2021 at 1:45 PM
    #54
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    This Rib Design seems futuristic. Guessing it adds 5hp.




    upload_2021-1-18_16-44-47.jpg
     
    Clintotron likes this.
  25. Jan 21, 2021 at 1:08 AM
    #55
    assassin10000

    assassin10000 New Member

    Joined:
    Oct 27, 2020
    Member:
    #54157
    Messages:
    1,866
    First Name:
    Andrew
    Northern CA
    Vehicle:
    '05 SR5 AC
    Remote start alarm Removed keyless entry piezo Qi phone charger & dash mount Subaru underseat subwoofer Hopkins Easylift Steering wheel audio controls No-tenna mod 3/4 adhesive anti-rattle shim D/S door
    My best guess would be in case the bumper/fender is off, the scoop doesn't become a debris/snow/sand catcher.

    ___________________________________________________


    Ordered one over the weekend and picked it up earlier today.

    This will only work with the oddly shaped 05 & 06 VVT-i airbox inlet. The earlier ones are smaller in diameter.

    IMG_20210120_182718.jpg
    IMG_20210120_182724.jpg


    Test fit into the fender was successful.
    IMG_20210120_181600.jpg

    Picture is of the 1st cut with about 1/2" to 5/8" lip remaining. I cut it further back to about 1/4" after removing the foam tape.
    IMG_20210120_185427.jpg

    I also had cut the bottom portion except for a lip off of the rubber TRD stack. If you look at the 1st pic, basically I trimmed the part with the rectangular hole that helps retain it to the TRD CAI.

    Looks like this in the fender now:
    IMG_20210120_192723.jpg


    Whether or not it makes a difference is hard to say without a dyno. Maybe worth bragging rights? It was only $8.


    I did a MPG check.


    MAF Gs / Load %, Est. MPG and # of readings averaged.

    2075rpm 65mph 5th
    34.4/34.8 19.1 x27

    2200rpm 70mph 5th
    39.9/38.3 17.6 x20

    2375rpm 75mph 5th
    48.2/43.0 15.7 x10

    w/TRD

    2075rpm 65mph 5th
    34.0/34.9 19.2 x32

    2200rpm 70mph 5th
    40.4/38.4 17.6 x32

    2375rpm 75mph 5th
    46.9/42.3 16.0 x13

    Possibly gains at 75mph. Makes sense as the velocity stack doesn't help much until air starts really flowing. I'd need a dyno to see how it helps on max hp, acceleration, mid-range and tip-in.
     
    Last edited: Jan 21, 2021
  26. Jan 21, 2021 at 4:36 AM
    #56
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Cool write up @assassin10000

    I’ll remove my box this weekend as it will give me a good reason to Feather Dust underneath it. Might put some Ric Flairs on the outer scoop using a Heat Gun as described earlier.

    Thinking out loud here that it looks like the Original Opening on the OEM Pipe has a larger surface area opening ‘scoop’. Your new one has a smaller area scoop. I’m measuring the angle of the dangle on the OEM pipe vs. the squared off new one.
     
  27. Jan 23, 2021 at 7:53 AM
    #57
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Added some curves to the Intake Tip using a Heat Gun to slightly melt the ABS and shaped it with a wooden implement. Prior, I ported off the square edging around the rim to give the air some taper.

    upload_2021-1-23_10-46-33.jpg

    upload_2021-1-23_10-48-36.jpg
     
    Darkness likes this.
  28. Jan 23, 2021 at 7:58 AM
    #58
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Ported the top portion of the Air Box Inlet Pipe. Next step is adding a ‘Ric Flair’ on the MAF Inlet.



    upload_2021-1-23_10-56-53.jpg

    upload_2021-1-23_10-57-42.jpg
     
    FrenchToasty likes this.
  29. Jan 23, 2021 at 1:04 PM
    #59
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
  30. Jan 23, 2021 at 2:50 PM
    #60
    assassin10000

    assassin10000 New Member

    Joined:
    Oct 27, 2020
    Member:
    #54157
    Messages:
    1,866
    First Name:
    Andrew
    Northern CA
    Vehicle:
    '05 SR5 AC
    Remote start alarm Removed keyless entry piezo Qi phone charger & dash mount Subaru underseat subwoofer Hopkins Easylift Steering wheel audio controls No-tenna mod 3/4 adhesive anti-rattle shim D/S door
    Hopefully it works for the better. MAF sensors can be super picky about turbulent air flow and do strange things.
     

Products Discussed in

To Top