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Pod reverse engineering

Discussion in 'XJ Technical Chat' started by kevineleven, Nov 26, 2006.

  1. kevineleven

    kevineleven Member

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    Here's a thought. I bought pods 100% for the look of them. I understand the increased airflow requires rejetting, but I really dont want to spend the $100 or so quite yet. My thought is this. How about making a foam (or other material) insert to go inside the pod to restrict the airflow back down to around the stock level? Anyone else think of or try this? I'm probably going to tinker with the idea a bit, I'll let you know what I come up with.
     
  2. RickCoMatic

    RickCoMatic Well-Known Member

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    You're going to need Dr. Charlie Eppes, from NUMB3R'S, to help you along with calculating the degree of restriction.

    Technically, there is only the one air intake port, the rubber inlet at the top of the airbox, where you'd have to measure Intake Cubic Feet per Minute.

    Calculating the total intake air, plus the resistance of the air filter will give you a ball-park CFM to split four ways ...

    I already have a headache just thinking about it!
     
  3. kevineleven

    kevineleven Member

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    I'm not much of a technician, more of a trial and error mechanic. If anyone wants to do calculations or whatever, be my guest. I'll be in the garage building, trying out, modifying, re-modding, and generally f*king around till I get a level of performance I'm happy with. While I can appreciate people who must have everything *exactly perfect* and by the book, that's not me. I believe "good enough" is good enough.
     
  4. nimitz

    nimitz Member

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    I don't understand all this personally. I put the pods on my bike when I first got it and didn't re-tune anything and it runs great!

    I suppose it's remotely possible that the bike already has been re-jetted but I really don't think so. :?
     
  5. kevineleven

    kevineleven Member

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    I think mine runs alright too although i have some powre loss off the line. above 3500rpm it screams like chewbacca with diahrrea.
     
  6. nimitz

    nimitz Member

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    Dude. That is NOT an image I want in my head. ;)
     
  7. bosozoku

    bosozoku Member

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    The biggest reason for rejetting after installing individual filters is that the airbox's resonance is no longer in play, and the carbs are seeing different conditions than they were designed for. It's no big deal aside from really soogy off-idle response. If you rejet, you'll get most of this back, but the midrange still will not be as good as it was with the stock airbox.

    Buy a decent jet kit and follow the instructions to the letter. It's a smarter move than trying to adjust the restriction with foam.
     
  8. RickCoMatic

    RickCoMatic Well-Known Member

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    Exactly! The "Figurin'-out" has already been done by the Company selling the kit.

    But what the "Kit Seller's" didn't take into consideration is ... that somebody with the smarts to install the Kit will be looking for more than just the improvements the Kit supply's. The "Always looking for more" guys.

    I wish there was some "Chart-type" Visual Aid to let us know what goes best with various Carb Mods.
     
  9. kevineleven

    kevineleven Member

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    Perhaps I should have worded it better. I *ENJOY* screwing around with things like this, rather than bolting on someone's remedy for $100. Trying other ways of doing things, experimenting is fun. Seldom is it the best, easiest and most correct way to do things, but the most enjoyable for someone like myself with a little time on my hands. And if I fail or am not happy with my results, the $100 fix is one email and credit card transaction away. And if I'm successful, maybe I'll patent my "No re-jetting required" pod filters. Available at all fine retailers nationwide. :)
     
  10. RickCoMatic

    RickCoMatic Well-Known Member

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    Be sure to supply 5 different values of Blanking, Color-coded wafers, easily exchanged by expanding the stainless clamping ring and slipping in a different color and pattern-cut wafer.

    Restrictor plate racing ... just like NASCAR!
     
  11. kevineleven

    kevineleven Member

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    See Rick, now you're gettin' it!!!

    :)
     
  12. nimitz

    nimitz Member

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    If you're going to do that then why not create a two-piece pod with a twist-lock between the rubber boot and the filter. That way you just twist it off, switch the restriction "wafer", then twist it back on.

    You could even make it slightly spring loaded so it acts the same way the pegs on a taillight bulb do and won't vibrate loose.
     
  13. kevineleven

    kevineleven Member

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    I'm gonna owe you all royaltys!
     
  14. OneShoe50

    OneShoe50 Member

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    I know I have had better luck with the Uni-Filter foam style than the pleated K&N style. On my KZ1000, it had the pleated style and I broke one right before a week long ride, went to the store no pleated style, all they had was the round foam type, so I bought them. The bike ran better with the foam style than the pleated style, I not sure if it was the different surface area, the restriction level or what, but I won't use anything but the foam type from now on.

    (The following was not an endorsement for any brand name of filter, unless some company would like to sponser me :) )
     
  15. kevineleven

    kevineleven Member

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    thanks, i might try them should i have no luck with me experiment by the time i b=need new filters.
     
  16. kevineleven

    kevineleven Member

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    Holy typos!!!
     
  17. blame_the_po

    blame_the_po Member

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    so. any luck with this ?
     
  18. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Way to bring up a 3 year old thread. :p
     
  19. Zookie400

    Zookie400 Active Member

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    with the 10% ethanol in the fuel now, you should have needed a re-jet/screw turn already.
     
  20. blame_the_po

    blame_the_po Member

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    Hey, just figured I'd start this up instead of starting a new thread with all the same info and questions. Anyway, I'm not looking to avoid re-jetting, I already have. Just trying to the XJ running better.
     
  21. RickCoMatic

    RickCoMatic Well-Known Member

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    If I had the inclination to MODIFY a set of Air Cleaning Pods to reduce the amount of FREE FLOWING Intake Air so as to regulate the amount of Air being allowed to pass through the Pods into the Engine, ... I'd probably experiment with:

    Pre-Fabricated Perforated Sheet Metal
    -or-
    Wire Cloth

    You'd have to do some "Hole-size" -- "Mesh-weave Tightness" experimentation and some "Tailoring" to construct an INSERT that would fit within the inside of the Pod Basket.

    Then, clean-up the Tailored-fit Prototype and make a PATTERN to Fabricate four Custom-Tailored Inserts capable of reducing the Intake Air Volume sufficiently for the Carbs to maintain the Ideal AIR~Fuel Ratio.

    Using Material similar to what these Company's supply:

    http://www.perf-plus.com/prod1.htm

    http://www.diamondman.com/perforated-metal
     

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