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DIY: Twintake done right

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  • DIY: Twintake done right

    Just pulled the bumper off today to install the skid plate mounts, thought I might as well show you guys how I made my " V2 Anti-Hydrolocking Cold Air Intake" sometime ago.
    My homemade intake a bigger pipe diameter and better air flow than almost any cold air intakes on the market, and it nearly eliminates the worry about hydrolocking unless you drive into a lake.
    If you don't feel like cutting factory plastic stop right now.
    1. Buy the biggest flexible pipe(the one I bought is 4.5inch 20m long when extended) you can from homedepot, mine was $2.97 since the ends were broken. Also buy a 2.25 inch pipe while you are there(30cm is enough only using it for the secondary intake.).
    2. Remove the factory intake box and duct. You won't need the duct from now on.
    3. Cut a 2.2inch hole on the bottom of the air box(left side), enlarge the factory duct hole until the big pipe fits.
    4. Remove the front bumper and driverside headlight cover.
    5. Now you can see a fairly big opening from the engine bay to the driver front side of the fender. All aftermarket cold air intakes use this opening to get their systems to get cold air. We will use this opening too, but we need to enlarge the opening a lot more to get our 4.5inch diameter pipe through.
    6. Start trimming the plastics until the opening is large enough to fit the 4.5inch pipe.
    7. Install the 2.25 inch pipe like this

    The use of this pipe is to prevent hydrolocking, because it sits much higher than the 4.5inch pipe. But at the same time it sits lower than the top section of the VR6 engine(hottest part), so it won't draw hot air into the engine like short rams and swiss cheesed boxes.
    Another pic of the backup(antihydrolock pipe) from the bottom.
    8. Now with the 2.25 inch pipe secured install the 4.5inch pipe, you might need to move the electrical connector a little near the opening you just cut.

    9. Put a new paper filter in and put everything back together.
    10. Remove the driverside lower grille. And route your 4.5inch pipe like this.
    11. Get your exacto knife and turn it into a real grill like the passenger side.
    12. Enjoy the intake sound and extra power!
    The intake sound is very noticable from 2500rpm even with my Magnaflow catback roaring.
    There's definitely more power and torque, especially torque! Mine was done in early August and the extra power was very noticable.
    Total cost was less than $10 but you do have to cut and trim lots of stuff.
    The best part about my twintake is that you don't have to worry about hydrolocking even though you have a bigger intake than any aftermarket setup, also you can keep the OEM look in the engine bay and use stock filters.
    Last edited by kujiwara; 11-23-2013, 05:54 PM.
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  • #2
    Re: DIY: Twintake done right

    That's one way to do that...
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    Don

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    • #3
      Re: DIY: Twintake done right

      i don't really get it still man, until i see numbers i just don't believe it. also, does this mean you are running no filter at all?

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      • #4
        Re: DIY: Twintake done right

        If you ran a aftermarket air intake, don't must companies offer a coupler that prevents or helps eliminate some water intake?

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        • #5
          Re: DIY: Twintake done right

          Originally posted by danaldson View Post
          i don't really get it still man, until i see numbers i just don't believe it. also, does this mean you are running no filter at all?
          +1. If the extra pipe is feeding into the airbox, I don't see how it would make much of a difference. Yes, you'll get more into the box, but the airflow is just as restricted as it was from the factory after the filter since the size of the pipe leaving the box hasn't changed.
          Scott
          '18 Porsche 718 Cayman GTS | Sapphire Blue Metallic | Black/Chalk
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          • #6
            Re: DIY: Twintake done right

            I see a few problems with this, i do believe this mod is useless and your butt dyno is misleading you.

            1. That pipe you added is rough on the inside which increases turbulence and flow friction, thus slowing down air along the walls of the pipe and warming it up in temperature.
            2. Your cylinders produce a given amount of vacuum at certain RPM's so your engine can only draw so much air in regardless of your intake quantity or size
            3. Fluids flow in the path of least resistance so more air is going to be drawn through the shorter tube most likely, and the long blue tube would be drawing much less.
            4. Flow rate= Flow velocity x duct cross sectional area. When you increase your duct cross sectional, the flow velocity lowers and the flow rate remains the same.
            Mitch

            1996 Harlequin
            2001 Toyota Highlander

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            • #7
              Re: DIY: Twintake done right

              I've been told that ripples in piping like that restrict airflow. Maybe a smoother type of tube would be more efficient. But how efficient? Probably unnoticeable. I guess points for creativity and thinking outside the box (haha, punny), but totally pointless in my opinion.
              Buy my stuff!
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              • #8
                Re: DIY: Twintake done right

                Originally posted by Mcrow View Post
                I see a few problems with this, i do believe this mod is useless and your butt dyno is misleading you.

                1. That pipe you added is rough on the inside which increases turbulence and flow friction, thus slowing down air along the walls of the pipe and warming it up in temperature.
                2. Your cylinders produce a given amount of vacuum at certain RPM's so your engine can only draw so much air in regardless of your intake quantity or size
                3. Fluids flow in the path of least resistance so more air is going to be drawn through the shorter tube most likely, and the long blue tube would be drawing much less.
                4. Flow rate= Flow velocity x duct cross sectional area. When you increase your duct cross sectional, the flow velocity lowers and the flow rate remains the same.
                1. I did consider the turbulence caused by the walls but I never considered the friction problem since it's just air, I need to find some way to smoothen up that pipe if I can justify the friction heat issue with a temp probe caused by the sidewall.
                2. Yes, ideally the factory system is enough but when the outside conditions are not ideal, a more open intake system is needed. This is also why many YouTube videos show no significant gain with a CAI over stock on a dyno+fan but many people say there are gains when they're actually driving around.
                3. Yup, so when the much lower main pipe submerges in water, the engine can still run with the smaller shorter pipe alone. That's the reason why I included a secondary pipe.
                4. Yeah... I interpret it like air pressure(boost pressure). But when a bigger turbo make the same pressure as the smaller turbo the bigger one always make more power.

                Any suggestions to improve the V3 twintake are welcomed, feel free to say anything, this thread is all about experimenting. Lol.
                We need some LOLZ in this forum lol.
                Last edited by kujiwara; 11-23-2013, 10:57 PM.
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                • #9
                  Re: DIY: Twintake done right

                  The turbulence in the corrugated pipe is not going to heat up the air lol.
                  An increased pipe size will allow for more air to flow with the same vacuum that the engine provides due to its lower overall friction (exceptions apply for different materials/corrugations/lengths/etc)

                  Do we really need to keep getting into this? Take even a basic gas dynamics course in university and you will be filled with the knowledge you seek

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                  • #10
                    Re: DIY: Twintake done right

                    Kuji...either put a turbo on your VR6...or get a car with a turbo'd engine, I appreciate your efforts, however they could be better spent on those types of engines. lol
                    Hers 2009 Audi A4 6sp manual
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                    • #11
                      Re: DIY: Twintake done right

                      Originally posted by Geobmx4life View Post
                      Kuji...either put a turbo on your VR6...or get a car with a turbo'd engine, I appreciate your efforts, however they could be better spent on those types of engines. lol
                      Buy supercharger; profit.
                      TJ
                      '17 Ram 3500 Laramie
                      '01 Silver S4

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                      • #12
                        Re: DIY: Twintake done right

                        I'm sorry but wow that just seems ghetto.
                        2007 A3 3.2vr | S-line | Quattro | Brilliant Black Sold
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                        • #13
                          Re: DIY: Twintake done right

                          Originally posted by Ponto View Post
                          I'm sorry but wow that just seems ghetto.
                          Lol I thought so too! Hahaha
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                          2004 Audi A2 FSI Colour Storm RHD
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                          • #14
                            Re: DIY: Twintake done right

                            Originally posted by funkin View Post
                            Buy supercharger; profit.
                            I would buy your supercharger if it works on a 24V, it would be one hell of a deal.
                            Current Fleet
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                            2001 Cobra #88/3786
                            1989 Jetta Trophy 1 of 500
                            2004 Audi A2 FSI Colour Storm RHD
                            2015 B8.5 S4 Sepang/Technik/6MT/SD/AAD/CF

                            Motorsport Engineer

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                            • #15
                              Re: DIY: Twintake done right

                              Sooo rice, I would expect this on a CRX

                              http://forums.audiworld.com/showthread.php?t=2510357
                              2012 VW Jetta GLI

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