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    • GIAC releases Porsche 991.2 Turbo S ECU flash tune software, comparison to 991.1 Turbo S

      Very nice gains from GIAC here on the new Porsche 991.2 Turbo S. Keep in mind the 991.2 Turbo S gets larger turbochargers compared to the Porsche 991.1 Turbo S. On paper, 991.2 output is rated at 580 horsepower which is an increase of 20 over the 991.1 Turbo S.


      The torque number for both the 991.1 Turbo S is 516 lb-ft at the crank although overboost is said to be 553 lb-ft which is the same as the rated 991.2 Turbo S figure. Well, the torque rating is underrated for both but the 991.2 does make a bit more torque.

      The claimed crank horsepower gain is right on the money.

      Look at these GIAC 991.1 Turbo S results stock and tuned:


      Now look at the 991.2:


      These are different Dynojets but they both are running STD correction. The 991.2 is mildly more powerful in stock form and when tuned also keeps a fairly mild edge.

      The main question here will be if the 991.2 retains its performance run after run. Several tuners including GIAC commented on 991.1 Turbo inconsistency: http://www.porscheboost.com/content....de-40-whp-loss

      One would venture to guess that the heat soak issue and the ECU pulling power are resolved.


      This article was originally published in forum thread: GIAC releases Porsche 991.2 Turbo S ECU flash tune software, comparison to 991.1 Turbo S started by Sticky View original post
      Comments 4 Comments
      1. Forced Air's Avatar
        Forced Air -
        "Keep in mind the 991.2 Turbo S gets larger turbochargers compared to the Porsche 991.2 Turbo S. On paper, 991.2 output is rated at 580 horsepower which is an increase of 20 over the 991.2 Turbo S."

        The 991.2 has larger turbos and more power than itself.....?
        Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Forced Air Click here to enlarge
        "Keep in mind the 991.2 Turbo S gets larger turbochargers compared to the Porsche 991.2 Turbo S. On paper, 991.2 output is rated at 580 horsepower which is an increase of 20 over the 991.2 Turbo S."

        The 991.2 has larger turbos and more power than itself.....?
        Click here to enlarge
        Click here to enlarge
      1. Forced Air's Avatar
        Forced Air -
        Gotcha! We have to keep you on your toes. Keeps your editors salary payments down.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Forced Air Click here to enlarge
        Gotcha! We have to keep you on your toes. Keeps your editors salary payments down.
        I'm just glad I don't have to pay you guys.