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intake questions, not your typical ones either

Discussion in 'Technical Chat' started by 08pretaco, Mar 12, 2010.

  1. Mar 12, 2010 at 7:24 PM
    #1
    08pretaco

    08pretaco [OP] Almost there

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    ok so i am kind of curious, for an intake system what qualitites make certain power "increases" aka hp or torque.

    your typical CAI from say k&n, the way thats designed is "more" power at a higher rpm due to, im guessing, air being more available to get into the engine.

    so does anyone have any input or thoughts about this. any specific sites, articles or web pages i can visit to read up on this.

    ill restate the question: what specs or qualities in intake systems help provide more power and why/how those qualities help with the increases.

    thanks for reading and only reason im asking is because i am a very bored young man and was thinking of fabing something up and since my professor has alot of friends in auto i can get some maybe free dyno time in and see what happens with a couple different designs.
     
  2. Mar 12, 2010 at 10:38 PM
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    08pretaco

    08pretaco [OP] Almost there

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  3. Mar 12, 2010 at 11:03 PM
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    XrunnIT

    XrunnIT Well-Known Member

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    -Least amount of restriction
    -Location for pulling the coolest air possible (cooler air = denser air, more air = more power)
    -MAF accuracy (so the ECU can apply the correct amount of fuel, when used with a tune, provide a more accurate/powerful AFR mixture).
     
  4. Mar 13, 2010 at 7:22 AM
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    08pretaco

    08pretaco [OP] Almost there

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    I like your thought in your sig! :thumbsup:

    So then I got a couple more questions...since your wanting colder air does the length of the tubing play any role in intake? With same intake temp. If you have a shorter tube to the throttle bodyrather than a longer one is thete any benefit to that? Reason I ask is because the trd for the v6 is a lot shorter than the cai from urd. Then does placement of the maf make any difference?
     
  5. Mar 24, 2010 at 2:21 PM
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    08pretaco

    08pretaco [OP] Almost there

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    if you increase the piping diameter then do you need to make any adjustments to the maf or can you just mount it into the new piping? meaning does it have to sit a certain way inside the piping because the air flow on the outside flows slower than the air flow in the center?
     
  6. Mar 25, 2010 at 5:17 PM
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    08pretaco

    08pretaco [OP] Almost there

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    Anybody got their .02 they would like to say about the couple of questions ^
     
  7. Mar 25, 2010 at 5:24 PM
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    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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    So...less "intake questions" and more "how internal combustion gasoline engines work"?
     
  8. Mar 25, 2010 at 5:50 PM
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    08pretaco

    08pretaco [OP] Almost there

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    What do you mean by how internal combustion engines work? I thought what I asked was pretty intake specific: if you do larger intake piping do you need to do any special placement changes in your maf since it will sit differently in larger tubing than in a smaller diameter one and how different lengths of piping make a difference.
     
  9. Mar 25, 2010 at 6:01 PM
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    NEBULENCE

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    I have an AEM Brute Force Intake with a Dry filter Charger (NO OIL) and all the specs and gains are available at http://www.aempower.com/
     
  10. Mar 25, 2010 at 6:08 PM
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    08pretaco

    08pretaco [OP] Almost there

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    I have an idea already of something I'm going to fab up just a few things that I don't know the answers to. My idea thus far copied in a way the weapon r system by using a smaller diameter tube that has a larger diameter pipe around it to create a venturi effect. Someone else made a "intake" for the 4 banger and says he feels like he lost some low end power due to using a larger diameter tubing and maybe this idea will help bypass that.
     
  11. Mar 25, 2010 at 6:14 PM
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    Mr. Brown

    Mr. Brown Well-Known Member

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    I'll try and take a shot at this. You want to know how and why Aftermarket intakes are better than stock, right?

    Well, it's all about air, fuel, compression, and a chain reaction. The way you increase horsepower is by increasing air, fuel and compression. The intake allows a greater amount of colder, denser air to flow into the engine. The computer sense the air intake and compensates with fuel( to a certain point.) So now you have a greater amount of cold dense air, and more fuel push into the same size area as before. Whammo, you have just increased your explosion size that pushes down piston. Bigger explosion equals more power. that's the theory behind intakes, exhausts, and headers. It is also the theory behind superchargers and turbos. At some point though, you'll have to start adding to the fuel side of the equation to keep seeing gains. A lot of people do this by reprogramming their engines, upgrading injectors, etc.

    This is a very dumbed down version of the combustion process, but I hope it helps.

    Is this in the lines of what you are looking for?
     
  12. Mar 25, 2010 at 6:16 PM
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    Mr. Brown

    Mr. Brown Well-Known Member

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    Yeah any time you increase your pipe size on your intake or your exhaust you risk losing some low end, because of the decrease in back pressure.
     
  13. Mar 25, 2010 at 6:30 PM
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    Beau02

    Beau02 Black Taco

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    I'll try to throw some change in the jar...

    • Why do you get more power from a CAI? From my understanding, you get the power advantage in two ways; First, the filter is larger and of different construction, allowing more airflow with less restriction, and Second, the intake tube has a smoother interior with a more gradual elbow reducing pressure drop in the tube.
    • Does the length of tube make a difference? Yes, as with any sort of piping, increasing the length increases the pressure drop, reducing the flowrate (think of trying to drink a milkshake through 2" straw versus a 10" straw).
    • If you increase the diameter of the intake tube, do you need to make any changes to the MAF? This is only my assumption, but I would guess that changing the diameter would do bad things to the MAF. I believe the MAF alone only truly determines the air velocity. If you increase the diameter of a pipe while maintaining the flowrate the velocity will decrease. I would assume that a decrease in velocity at any given RPM would throw off the MAF and therefore you air/fuel mixture?
     
  14. Mar 25, 2010 at 6:33 PM
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    08pretaco

    08pretaco [OP] Almost there

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    I know how engines work lol but thanks. And I do realize to a point you get power than it drops off and have a negative affect. Iv figured out what I'm doing about the intake size and blah blah.

    I'm to the point where I'm trying to figure out how to put the sensors into the piping now. Can I simply make a mount and put the maf into the new pipe? The change in diameter will not mess with the sensoring of mass air flow being that it will be sitting differently due to the larger tubing?
     
  15. Mar 25, 2010 at 6:55 PM
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    Beau02

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    Maybe I'm just not following your point, but that last sentence doesn't seem to make any sense. What exactly are you trying to ask or state?
     
  16. Mar 25, 2010 at 6:58 PM
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    08pretaco

    08pretaco [OP] Almost there

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    The last bullet covers my question, thank you
     
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