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  1. #1
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    GIAC is the first tuner to release a 991 Turbo OBD-II ECU flash tune - +33 all wheel horsepower, +60 torque

    Much respect to GIAC who is the world's first tuner to release an OBD-II ECU flash for the Porsche 991 generation 911 Turbo. GIAC is getting nice gains out of the already aggressively tuned 911 Turbo on 93 octane. On a Dynojet in STD correct GIAC shows a peak horsepower increase of 33 at the wheels and 60 lb-ft of torque at the wheels. They achieve a torque bump through the curve and a very nice torque gain once the turbos spool past 2500 rpm.

    Click here to enlarge

    Now, the 991 Turbo does not seem to show performance or horsepower consistency. GIAC posted only two runs so to get a better idea of the gains PorscheBoost would love to see multiple runs and how/if the power changes from run to run. Fabspeed's 991 Turbo Dynojet numbers show a pretty large power and torque variance from run to run on 93 octane. We do not have many dyno runs to go by for the 991 Turbo but GIAC's peak baseline power figure looks similar to the peak figure Fabspeed hit which was 494 to the wheels although in SAE correction.

    The puzzling thing is that Fabspeed shows a torque figure of 602 lb-ft at the wheels which just can not be right. The GIAC figure of 486.28 lb-ft at the wheels seems more accurate. GIAC's tuned torque figure is 546 lb-ft at the wheels which is a gain of 60 lb-ft over their 476 lb-ft baseline. GIAC does not specify if the baseline and tune are on the same fuel only that 93 octane and 91 octane testing took place. One can expect higher gains with higher octane and especially with race gas.

    This is very early in the 991 Turbo tuning game and we will get a better idea of the power gains and performance as more tunes come out and more dyno runs are done.

    Congratulations to GIAC on their tune and being the first to market. The software is $3500 which is not cheap (and this will drop over time) but in addition to increasing boost they change timing and the torque limits for the transmission. Now to see some 1/4 mile times with the tune!

    Click here to enlarge

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    500 lbs-ft at 2700 rpm , sicko
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


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  3. #3
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    Does this, more or less, bring us to Turbo S power? Are there any engine hardware differences between the Turbo and the S or is it tune only?

  4. #4
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    Click here to enlarge Originally Posted by Stevenh Click here to enlarge
    Does this, more or less, bring us to Turbo S power? Are there any engine hardware differences between the Turbo and the S or is it tune only?
    It does bring you up to Turbo S power but yes there are hardware differences between the two.

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