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    • 2017 Porsche 911 (991.2) Carrera S PDK Dynojet results with cat bypass pipes - 416 rwhp

      Dyno results for the 991.2 generation Porsche 911's with the 9A2B6 3.0 twin turbo flat-6 are somewhat hard to come by. Fortunately, BoostAddict member @///M3THOD put his 991.2 Carrera S PDK on the Topspeed Motorsports Dynojet.


      His car is stock other than the Fabspeed cat bypass pipes. The problem though is he did not get a baseline:


      416 horsepower and 412 lb-ft of torque at the wheels is very healthy for just cat bypass pipes especially when the car is rated at 420 at the crank. The turbo 9A2 3.0 engines are underrated.

      What does a stock 991.2 Carrera S look like on a Dynojet? Well, GIAC claims on the Champion Motorsport Dynojet that the car dynos 372 to the wheels. Additionally, Cobb released a graph showing 382 whp on a Dynojet. The baseline ranges look very similar.

      Are cat bypass pipes alone picking up 30+ whp? Well, the only way to find out is for the PorscheBoost.com project car to test the pipes and do a baseline overlay. We are waiting for @Soul Performance Products to get back to us regarding a sale of bypass pipes.

      This article was originally published in forum thread: 2017 Porsche 911 (991.2) Carrera S PDK Dynojet results with cat bypass pipes - 416 rwhp started by Sticky View original post
      Comments 30 Comments
      1. quattr0's Avatar
        quattr0 -
        Hmmm...i understand results could be varied but my base makes 350 whp on dynojet and now i wonder why both GIAC and Cobb numbers on the S seem low?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Hmmm...i understand results could be varied but my base makes 350 whp on dynojet and now i wonder why both GIAC and Cobb numbers on the S seem low?
        You dyno'd your base? I made 345 on a Mustang...
      1. quattr0's Avatar
        quattr0 -
        You must have forgotten..... http://www.porscheboost.com/showthre...629#post761629
        @///M3THOD how's the sound after Fabspeed pipes?
      1. F16HTON's Avatar
        F16HTON -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Hmmm...i understand results could be varied but my base makes 350 whp on dynojet and now i wonder why both GIAC and Cobb numbers on the S seem low?
        No two dyno's read the same, the dyno is a tuning tool, the only number that ever matters is delta. Anything else is just white noise.
      1. quattr0's Avatar
        quattr0 -
        Understood but both Sticky's and mine having close readings so i figure the S should be at least 400 at the wheels. No doubt before and after are the only measure that is close to reality.
      1. F16HTON's Avatar
        F16HTON -
        One thing about the Mustang dyno is that you can get the numbers in "dynojet mode" which is an additional correction factor which bumps the number up.

        Some tuners will report in "dynojet mode" others will not. There are also multiple software versions for each brand of dyno, and there are many calibration factors that can be used too.
      1. quattr0's Avatar
        quattr0 -
        Agreed. Rep you but Sticky said i must spread my rep around.

        Point is I have Speedtech exhaust installed and the after dyno didnt show any gain and was consistent w my base dyno...so i doubt that the shop jacked w my number. Thanks for the Mustang tip! They could manipulate tge numbers on any dyno fr what Ive read.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        You must have forgotten..... http://www.porscheboost.com/showthre...629#post761629
        @///M3THOD how's the sound after Fabspeed pipes?
        I did forget!

        Interesting our baselines are close despite the different dynos.

        And man is that guy on Rennlist way off on dynos...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        No two dyno's read the same, the dyno is a tuning tool, the only number that ever matters is delta. Anything else is just white noise.
        Not exactly. If you know baselines from a Dynojet then you have a large base of files to compare.

        I can pretty much tell you what it will tap and how much power it is really making based on a Dynojet run.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Understood but both Sticky's and mine having close readings so i figure the S should be at least 400 at the wheels. No doubt before and after are the only measure that is close to reality.
        No. We're definitely in that ~350 range and the S in tht ~375 range. Pretty much spot on since the S traps 2 mph higher.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        One thing about the Mustang dyno is that you can get the numbers in "dynojet mode" which is an additional correction factor which bumps the number up.

        Some tuners will report in "dynojet mode" others will not. There are also multiple software versions for each brand of dyno, and there are many calibration factors that can be used too.
        True. Did you read this? http://www.boostaddict.com/content.p...an-vary-wildly

        AWE corrects theirs to read like a Dynojet.

        The best thing is to leave it alone.
      1. F16HTON's Avatar
        F16HTON -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        True. Did you read this? http://www.boostaddict.com/content.p...an-vary-wildly

        AWE corrects theirs to read like a Dynojet.

        The best thing is to leave it alone.
        I'm pretty confident that AWE and GIAC have their dyno's calibrated identically. I know at World Motorsports you have get your dyno reported in their heartbreaker results or dynojet mode.

        IMO the dyno operator is the biggest contributor in how results vary from dyno to dyno. Throttle tip in is an important factor (especially on turbo cars) on how much power is made, this is why waste gate duty cycle, throttle pedal position, throttle plate position and injector duty cycle/injector on time is logged when tuning.

        These results are never given to anyone in a standard dyno session, unless you are in the know, the piece of paper given to you is worthless.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        I'm pretty confident that AWE and GIAC have their dyno's calibrated identically.
        Well they don't...
      1. F16HTON's Avatar
        F16HTON -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Well they don't...
        Don't be so sure about that Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        Don't be so sure about that Click here to enlarge
        Proof?

        VF doesn't correct. My baseline and GIAC's baseline were similar. AWE admits to correcting. So...
      1. F16HTON's Avatar
        F16HTON -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Proof?

        VF doesn't correct. My baseline and GIAC's baseline were similar. AWE admits to correcting. So...
        Other than what has been told to me from those who are involved in the industry.

        GIAC does all of the calibrations for AWE. The do not have the resources to send the calibrators coastal. They rely on the ability to remote tune and validate in house.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        Other than what has been told to me from those who are involved in the industry.

        GIAC does all of the calibrations for AWE. The do not have the resources to send the calibrators coastal. They rely on the ability to remote tune and validate in house.
        That's great but whether they do not or do not or whatever has been said it doesn't change the fact the GIAC baseline for the same car is the same as mine on another Mustang and the the AWE-Tuning baselines are much higher.

        You'e just assuming and I'm going based on actual evidence. Plus speaking to GIAC directly they said they do not correct to read like a Dynojet.

        If that isn't enough, just look at all past GIAC released graphs and compare them to AWE's. In the link I provided, AWE directly states they correct.

        So, you're wrong.
      1. F16HTON's Avatar
        F16HTON -
        GIAC does not even have a OEM baseline for the 991.2 published. They used Brian @ Rotiform's car with a BBI Barcode exhaust. Perhaps the exhaust made power, perhaps it did not.

        Will we ever know? I guess we will have to ask BBI if they performed before and after testing during the development.

        AWE says their exhaust makes 14HP at the crank. If we subtract that from GIAC's baseline, does it still match up with yours at VF?

        I'm not picking a fight or busting your balls, just pointing out how pointless it is to try to compare any two dynos.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        GIAC does not even have a OEM baseline for the 991.2 published. They used Brian @ Rotiform's car with a BBI Barcode exhaust. Perhaps the exhaust made power, perhaps it did not.
        Did you compare that baseline to mine?

        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        I'm not picking a fight or busting your balls, just pointing out how pointless it is to try to compare any two dynos.
        Dude no worries at all I'm just pointing out you can definitely learn things from different dynos especially if you have runs to reference.
      1. F16HTON's Avatar
        F16HTON -
        I'll call up COBB and try to get a stock baseline on my car on Monday.