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    • Before/After IPD Plenum testing on a Cobb tuned Porsche 991.2 GTS 3.0 9A2B6

      BoostAddict already did testing of the IPD plenum over a year ago. Some questioned whether the IPD plenum was forcing the ECU to add more boost instead of removing a restriction. Well, this test on a Cobb tuned example should put that debate to rest.


      The curve shows similar mid-range gains to what we showed on a Mustang dyno:


      This testing was done by BGB Motorsports who made an amateur mistake. The baseline run is in Sport Plus while the IPD run is not. The different modes ramp in throttle response differently with different boost profiles. Oops.

      Regardless, the plenum clearly shows mid-range gains. At 4727 rpm the plenum picks up 18 lb-ft of torque at the wheels. Testing on the PorscheBoost.com Project 991.2 showed a gain of 21 lb-ft of torque at the wheels at 4700 rpm which can likely be attributed to better conditions and better fans.

      Regardless, the IPD Plenum is a great bang for the buck upgrade for the 991.2 9A2B6 3.0 motor.

      This article was originally published in forum thread: Before/After IPD Plenum testing on a Cobb tuned Porsche 991.2 GTS 3.0 9A2B6 started by Sticky View original post
      Comments 20 Comments
      1. LavaGTS's Avatar
        LavaGTS -
        Yeah they totally eff'd that one up. Doesn't look good for IPD right now but I'm still a believer.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LavaGTS Click here to enlarge
        Yeah they totally eff'd that one up. Doesn't look good for IPD right now but I'm still a believer.
        Why not good for IPD? The gains match exactly what I showed.

        What doesn't look good is these BGB Motorsports people calling themselves pros. It's not IPD's fault they dyno'd in different modes with the fans not properly set up.
      1. LavaGTS's Avatar
        LavaGTS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Why not good for IPD? The gains match exactly what I showed.

        What doesn't look good is these BGB Motorsports people calling themselves pros. It's not IPD's fault they dyno'd in different modes with the fans not properly set up.
        Not looking good because it's bad press for them. If a more proper dyno was done it would be a different story.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LavaGTS Click here to enlarge
        Not looking good because it's bad press for them. If a more proper dyno was done it would be a different story.
        Again, I don't see how it's bad press.
      1. LavaGTS's Avatar
        LavaGTS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Again, I don't see how it's bad press.
        Due to the sloppy dyno job and that graph where it shows the stock plenum making more hp/tq in the beginning and equal power at the end.

        People are going to see that sloppy dyno chart and be deterred IMO.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LavaGTS Click here to enlarge
        Due to the sloppy dyno job and that graph where it shows the stock plenum making more hp/tq in the beginning and equal power at the end.
        Yeah but it needs to be explained why that happened.

        Once again, the mid-range gains match mine exactly.

        Click here to enlarge Originally Posted by LavaGTS Click here to enlarge
        People are going to see that sloppy dyno chart and be deterred IMO.
        They are too stupid to own a 911 to begin with then.
      1. LavaGTS's Avatar
        LavaGTS -
        Haha, I agree that the 911 crowd for the most part is an interesting bunch.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LavaGTS Click here to enlarge
        Haha, I agree that the 911 crowd for the most part is an interesting bunch.
        Yep plus why not just look at my results that show it done properly? IPD tested it themselves. Can't get any better than that.
      1. ///M3THOD's Avatar
        ///M3THOD -
        I wish that they would just do it again. The whole point of a dyno is to provide quantifiable evidence of performance gains. When you screw up the most basic parameters to evaluate like for like conditions, it calls all of the results into question. No professional shop would release this and declare they had definitive results.

        It does appear that the IPD plenum picks up some tq midrange, but it also appear to lose tq low end.... now I am just saying it "appears" to, because we don't know what this curve looks like when running at full boost.

        If your stating that the curves look right, then its just how much (or any) of a tradeoff is there for the gain in midrange?

        There also seems to be a little safety plateau left in the power with the Stg.1 tune near redline, wondering if that will disappear with Stg.2.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ///M3THOD Click here to enlarge
        If your stating that the curves look right, then its just how much (or any) of a tradeoff is there for the gain in midrange?
        There is no tradeoff. Just look at my results with multiple pulls: https://www.boostaddict.com/content....d-dyno-results
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ///M3THOD Click here to enlarge
        There also seems to be a little safety plateau left in the power with the Stg.1 tune near redline, wondering if that will disappear with Stg.2.
        It's a canned tune. There is plenty left.
      1. BGBMotorsports's Avatar
        BGBMotorsports -
        For the record, I am a huge fan of PorscheBoost and I apologize that our first mention on here is in such poor context. For the record, I realize we needed the Sports Plus button pushed but by then it was too late as the car had already heat soaked. Fans most likely would have alleviated the situation. I wanted to put a dyno run up because was getting harassed by others about the IPD and i wanted to put something out there to show that gains are there to be made with bolt-ons. I love the IPD business and their products and was trying to show the benefit of it.

        I realize that we really must have fans on for dynoing FI cars but I've spent so many years dynoing cars without additional air because I like to see the worst case scenario. I hope this doesn't sour the opinion you guys have of our work. I know we are new to the game but we aren't hacks.

        Sticky, your site and your content is the reason I went and got the GTS in the first place so please don't give up on us. Thank you!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BGBMotorports Click here to enlarge
        For the record, I am a huge fan of PorscheBoost
        See people? I told you they exist.

        Click here to enlarge Originally Posted by BGBMotorports Click here to enlarge
        I realize that we really must have fans on for dynoing FI cars but I've spent so many years dynoing cars without additional air because I like to see the worst case scenario. I hope this doesn't sour the opinion you guys have of our work. I know we are new to the game but we aren't hacks.
        $#@! happens, don't let it get you down. Like I said your mid-range gains match my testing exactly so feel free to show the overlap to prove the doubters wrong.

        The main point IMO is your car with a tune showed the same gain as mine did without at tune. That 100% reinforces the product works as advertised.

        Click here to enlarge Originally Posted by BGBMotorports Click here to enlarge
        Sticky, your site and your content is the reason I went and got the GTS in the first place so please don't give up on us. Thank you!
        You flatter me good sir.
      1. BGBMotorsports's Avatar
        BGBMotorsports -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        It happens, don't let it get you down. Like I said your mid-range gains match my testing exactly so feel free to show the overlap to prove the doubters.

        The main point IMO is your car with a tune showed the same gain as mine did without at tune. That 100% reinforces the product works as advertised.
        Agreed. To be honest, I was shocked that the overall trend of the gains in power and torque from the plenum matched the graph the guys at IPD sent me when they dyno'd their 991.2 S. It was a big bump to the same exact section between 4.1K RPM and 5.5K RPM. I figured that with how much the car changes from run to run there's no way the runs would be consistent but if you tell me your curve looked similar to mine and mine looked similar to theirs, it reinforces the consistency.

        I am definitely new to the turbo tuning game but everything we have achieved in this business was a result of learning and then executing so we will get a handle on it. Any press is good press so thanks for the shoutout and thanks for putting such awesome content out there in the world. That dyno comparison of the 991.2 GTS vs. the 991.2 4.0L GT3 was the nail in the coffin for me buddy Cheers!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BGBMotorports Click here to enlarge
        but if you tell me your curve looked similar to mine and mine looked similar to theirs, it reinforces the consistency.
        See for yourself: https://www.boostaddict.com/content....d-dyno-results
      1. BGBMotorsports's Avatar
        BGBMotorsports -
        Now i know why i thought our dyno plots showed similar trends; the one Greg at IPD sent me was YOURS! Click here to enlarge
      1. LavaGTS's Avatar
        LavaGTS -
        Respect to BGB.
      1. magnumpsi's Avatar
        magnumpsi -
        Hi Tecce!

        -mitch
      1. F16HTON's Avatar
        F16HTON -
        @Sticky

        Curious as to why you would tag them as a guest vendor, but not take the time to fix the misspelling in user name?

        And for those who are taking the position that @BGBMotorsports are rookies, please take the time to read this.

        https://www.imsa.com/news/012017/bgb...yman-clubsport

        Additionally, I do not think that "Amateur" is the correct adjective to describe @BGBMotorposts. Here is Road and Track's take on the company.

        https://www.roadandtrack.com/new-car...s-manual-swap/
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        Curious as to why you would tag them as a guest vendor, but not take the time to fix the misspelling in user name?
        I missed it! Fixed, thanks.

        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        Additionally, I do not think that "Amateur" is the correct adjective to describe @BGBMotorposts. Here is Road and Track's take on the company.
        They obviously have a road racing background but that doesn't always translate to dyno testing seamlessly or mean they know all the modes on a new car which comes with experience.

        I've been tuning for almost two decades and I made a mistake at the strip with this car regarding a software mode. It happens.