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    • Porsche 991.2 Carrera 3.0 stock throttle body plenum versus Tial Sport Plenum flow rate

      The intake plenum modification on Porsche flat-6 motor often receives the most skepticism. Why? Probably because people feel a small part could not have the impact it does and if it did make the difference claimed Porsche would do it themselves.


      Well, having held the factory Porsche part in my hand I can tell you it is made as cheaply as possible. Porsche is in the business of making money, not squeezing out every last horse in a Carrera 3.0. Just look at the factory piece:




      The Tial Plenum design is lightweight with thin walls less than 2mm, it is plug and play, smooth interior surface design, custom one way check valve design to not interrupt internal flow that is rebuildable/serviceable, uses factory disconnects, and it is made with 3d printing.

      I was indeed surprised to see a plenum change does produce a nice gain on the dyno in the mid-range. It is not all that surprising once you see the flow data and the Tial piece simply outperforms the factory design in a critical area of the motor:


      Is the install complex? Not for someone who is familiar with the 911 and already is working back there. This is something you want to do with other parts to keep the labor costs down ideally but it is something you want to do no matter what to maximize the path of airflow to the motor. This is especially important once you start tuning the car or upgrade the turbos.

      As stated, a great bang for your buck item in the Tial 991.2 9A2B6 3.0 product suite. Feel free to PM or e-mail admin@boostaddict.com to order.












      This article was originally published in forum thread: Porsche 991.2 Carrera 3.0 stock throttle body plenum versus Tial Sport Plenum flow rate started by Sticky View original post
      Comments 7 Comments
      1. Stevenh's Avatar
        Stevenh -
        Seems like a logical piece to have pretapped for methanol bungs. Looks nice beyond that.
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Seems like a logical piece to have pretapped for methanol bungs. Looks nice beyond that.
        The problem with that is vacuum because it's after the throttle body. Plus the atomization room/time is basically gone now, cause it's inches from the intake manifold.
      1. Stevenh's Avatar
        Stevenh -
        Click here to enlarge Originally Posted by Payam@BMS Click here to enlarge
        The problem with that is vacuum because it's after the throttle body. Plus the atomization room/time is basically gone now, cause it's inches from the intake manifold.
        Both good points...
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Both good points...
        They built bungs into the intercoolers I believe...
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Both good points...
        The only good thing is that you can ensure both banks are getting equal fuel/methanol distribution. Fuel trims will stay balanced.

        Click here to enlarge Originally Posted by Sticky2 Click here to enlarge
        They built bungs into the intercoolers I believe...
        That's very good for atomization and give lots of time and room for it to fully mix into the air. Now the only issue with that is if you have BOVs. The methanol in the tract will spray out of the BOV during let off, that leads to potential fires Click here to enlarge

        As you can see, I have done extensive testing with supplemental fueling Click here to enlarge
      1. 3DMetal's Avatar
        3DMetal -
        The original design had 2 water Bosch injectors from the BMW M3 CS, and a water supply rail attached. That approach was eliminated in favor of adding injector bosses at the inter-cooler outlet postion.

        Spraying before the main IAT sensor is preferred.
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by 3DMetal Click here to enlarge
        The original design had 2 water Bosch injectors from the BMW M3 CS, and a water supply rail attached. That approach was eliminated in favor of adding injector bosses at the inter-cooler outlet postion.

        Spraying before the main IAT sensor is preferred.
        Our temperature reading is coming from the intake manifold like factory.