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    • IPD claiming 991.2 Turbo S gains of 70+ lb-ft of torque with their Y-pipe and Intake Plenum

      Color us a bit skeptical here as the gains are huge. The dyno was done at Cobb Socal though and Cobb certainly is reputable but what role they played in these dyno runs and how IPD is marketing them is unknown. Gains of 70 lb-ft of torque at all four wheels at 4300 rpm from a plenum and Y-pipe?


      From the looks of these dynos (and why the hell are the graphs so small? Seriously, what's the point of providing graphs people can't even read?) the gains all come in the mid-range with the plenum and Y-Pipe.

      Let's look at the plenum alone:


      There is a jump of 55 lb-ft of torque at 4300 rpm which fades quickly. You see an increase for a few hundred RPM. Now, that's good if true but hardly broad.

      Now look at the plenum with the Y-pipe:


      70 lb-ft of torque at all four wheels over stock at 4300 rpm. You see gains basically from 3800-5200. The Y-pipe does provide a slightly better curve but it's really just that mid-section where the majority of the gains come from.

      Is it a Porsche intake defect? What is the explanation here?

      We definitely want to see independent testing that verifies these claims. Not to mention, graphs that are readable.


      IPD took delivery of its 991.2 Turbo S and the R & D started the second it arrived at its new home. The new Turbo doesnít substantially benefit from any one particular upgrade, but the sum of its improvements deliver a superior overall Turbo compared to the already impressive 991.1 Turbo it replaces. Yes, we know the latest Turbo is faster with 20 more horsepower but itís the combination of lightening shifts, razor sharp handling and spiritual connection to the vehicle that elevates the driving experience of the extraordinary new 991.2 Turbo.

      Porsche made a number of substantial upgrades with the latest 991.2 Turbo. Engine improvements include revised intake ports, larger injectors, higher volume fuel pump, larger turbo compressor wheels and more efficient intercoolers, but the factory intake system remained relatively unchanged allowing the IPD Plenum and Y-Pipe to fit with only minor modifications.

      The 991.2 Turbo Plenum upgrade delivers staggering engine power and torque gains that will raise the performance bar of the already potent supercar as well as the hairs on your neck. Horsepower gains are found throughout the entire power band with the bulk of the gains being realized between the 3500-5000 RPM range. Max power gains of 45+ wheel HP come in at 4300 RPM and hold strong all the way to redline. Torque is even more impressive at 60+ in the midrange with a massive torque gains from 3500-5000 RPM.

      This article was originally published in forum thread: IPD claiming 991.2 Turbo S gains of 70+ lb-ft of torque with their Y-pipe and Intake Plenum started by Sticky View original post
      Comments 9 Comments
      1. TwistedTuning's Avatar
        TwistedTuning -
        IPD is legit. I dealt with them a lot when tuning and building Volvo R's. thats some crazy gains though. The stock piece must have really been $#@!.
      1. Sticky2's Avatar
        Sticky2 -
        I've never seen gains this large from IPD anything.
      1. Aaron's Avatar
        Aaron -
        They're completely believable if the company added a tune to the car at the same time.

        Add these parts to any turbo car, along with a custom tune, and you'll see huge gains. I'm guessing they did everything a normal tune would as well (Timing, boost, etc).
      1. Sticky2's Avatar
        Sticky2 -
        The curve is not representative of the gains with a tune.
      1. Aaron's Avatar
        Aaron -
        Could be, if the turbos are maxxed out, or they're running into knock, or they just suck at tuning. I'd agree with you, but I highly doubt this is a true before/after without any tune adjustments.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Aaron Click here to enlarge
        Could be, if the turbos are maxxed out, or they're running into knock, or they just suck at tuning. I'd agree with you, but I highly doubt this is a true before/after without any tune adjustments.
        No. How would that make any sense?

        That simply is not the curve of an ECU tuned 911 Turbo. You don't see a sudden spike at 4200 rpm with a tune. You see torque gains down low that peter toward redline. Plus, gains throughout the curve.

        This is what a 911 Turbo ECU tune curve looks like: http://www.porscheboost.com/content....-at-the-wheels
      1. Stevenh's Avatar
        Stevenh -
        Looks like the car is reaching boost a bit faster so you see big torque gains in an area you'll never been when you're really pushing it... This would be great around town and for passing without dropping a gear, but I doubt you'll see much picked up at the track.
      1. jyamona@motiv's Avatar
        jyamona@motiv -
        That is definitely an untuned gain, and a gain that could most likely be matched with the stock plenum and Y-pipe with more boost in that RPM range.

        If I had to guess, I'd say the IPD parts are just throwing off the expected airflow model of the DME, and in turn causing slightly higher boost where the gains are seen. Boost is decidedly absent from the graphs, I wonder why Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Well I'd like to see more results with and without a tune.