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    • Fabspeed Porsche 718 S ECU tune + manifold/headers and turbo back exhaust results - +60 lb-ft of torque at the wheels

      Fabspeed released Dynojet graphs of some 718 S Boxster/Cayman tuning results. They started with their turbo back exhaust system and manifold/headers and then added in an ECU tune. The tune is Fabspeed's own in-house software.


      That means it is calibrated to the Fabspeed exhaust pieces as well.

      Let's take a look at the graph:


      Solid gains there and very similar to the type of curve Cobb showed stock and tuned which means the majority of what there is to gain on the 718 S 9A2B3 2.5 liter is in that 2500-5500 rpm range. Past 6000 rpm the gains level off as the VTG turbo runs out of steam.

      At 4129 rpm the difference over stock is 92 lb-ft of torque at the wheels. Simply a huge gain.

      If you are looking for top end power you will need to change that turbocharger out (maybe bolt in the GTS unit) but with Fabspeed's exhaust and software 23 peak horses at the wheels were picked up.

      Supercup Turboback Exhaust: +14 whp & 10 ft/lbs
      Supercup Turboback Exhaust & ECU Tune: +73 whp & 92 ft/lbs
      Supercup Turboback Exhaust & ECU Tune Peak Power Gains: +23 whp & 60 ft/lbs


      This article was originally published in forum thread: Fabspeed Porsche 718 S ECU tune + manifold/headers and turbo back exhaust results - +60 lb-ft of torque at the wheels started by Sticky View original post
      Comments 10 Comments
      1. 12 TURBO's Avatar
        12 TURBO -
        It would be great if the tuned Cayman S 2.5 liter could make power like the tuned 2.5 liter in the Audi RS3 .

        Maybe Porsche should just ask Audi how to make a 2.5 liter or just put the Audi 2.5 liter into the Cayman and then the Cayman would have enough HP and torque to keep up with a four door Audi RS3.
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by 12 TURBO Click here to enlarge
        It would be great if the tuned Cayman S 2.5 liter could make power like the tuned 2.5 liter in the Audi RS3 .

        Maybe Porsche should just ask Audi how to make a 2.5 liter or just put the Audi 2.5 liter into the Cayman and then the Cayman would have enough HP and torque to keep up with a four door Audi RS3.
        Audi doesn't have 911 owners in the lineup who are people who lose their minds over headlight shape changes let alone a Boxster annihilating their precious 911.

        Porsche even set the turbo up here so it has no chance of topping a Carrera when tuned.

        Oh, and Porsche could build a a 2.5 liter that would embarrass Audi's if they needed to.

        No matter how fast the RS3 is it will never drive like a 718.
      1. Stevenh's Avatar
        Stevenh -
        Click here to enlarge Originally Posted by Sticky2 Click here to enlarge
        Porsche even set the turbo up here so it has no chance of topping a Carrera when tuned.

        It's really starting to look like this is the case. I had my fingers crossed for a 3,000lb, 400whp on pump, $50k bargain after a few years of depreciation.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        It's really starting to look like this is the case. I had my fingers crossed for a 3,000lb, 400whp on pump, $50k bargain after a few years of depreciation.
        Just ditch the VTG turbo or go for the 2.0.
      1. 12 TURBO's Avatar
        12 TURBO -
        Click here to enlarge Originally Posted by Sticky2 Click here to enlarge
        Audi doesn't have 911 owners in the lineup who are people who lose their minds over headlight shape changes let alone a Boxster annihilating their precious 911.

        Porsche even set the turbo up here so it has no chance of topping a Carrera when tuned.

        Oh, and Porsche could build a a 2.5 liter that would embarrass Audi's if they needed to.

        No matter how fast the RS3 is it will never drive like a 718.

        True, Audi does not have a 911 but I think the RS3/TTRS when tuned will out run an Audi R8.

        I agree the mid engine Cayman is excellent in terms of balance and drivers experience but the Cayman needs more Torque and horsepower. Maybe the new MB mid engine will get the formula right if it gets built and doesn't weigh 4000 lbs.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 12 TURBO Click here to enlarge
        True, Audi does not have a 911 but I think the RS3/TTRS when tuned will out run an Audi R8.
        True. This points more to the nature of turbos and forced induction though.

        Click here to enlarge Originally Posted by 12 TURBO Click here to enlarge
        I agree the mid engine Cayman is excellent in terms of balance and drivers experience but the Cayman needs more Torque and horsepower. Maybe the new MB mid engine will get the formula right if it gets built and doesn't weigh 4000 lbs.
        The Cayman and Boxster chassis' have always been capable of more but Porsche will always hold them back until the 911 does not exist.
      1. zuffenhouse's Avatar
        zuffenhouse -
        I suspect VTG contributes something to the responsiveness of the 2.5 ('I can't tell this is a turbo' - Randy Probst) along with its high average-to-peak hp ratio, benefiting real-world speed over bench-racing (of peak numbers).

        Rather than Porsche conspiring to thwart tuners with VTG, perhaps they went with the best existing technology for the application (single turbo>2.5 liters) and its the after-market tuners who have not yet mastered vane actuation control-loop?

        btw the stock 718 S does in fact run with the (admittedly, heavier) RS3 in a straight-line....slightly ahead actually.

        https://s3.amazonaws.com/amv-prod-ca...uattro2017.pdf

        https://s3.amazonaws.com/amv-prod-ca...erspdk2017.pdf
      1. zuffenhouse's Avatar
        zuffenhouse -
        Click here to enlarge Originally Posted by Sticky2 Click here to enlarge
        Porsche even set the turbo up here so it has no chance of topping a Carrera when tuned.
        I realize turbocharger size/capacity is naturally the first suspect on a tuning site analyzing disappointing peak hp gains from a tune-only flash. Consider, though:

        Porsche states 1.1 bar or 15.95 psi as max. boost level for the S. I'm observing 8psi (sometimes decreasing to 5psi) for long WOT pulls to redline in third gear. That seems like a very under-stressed turbocharger....

        How can the 64/55 VTG turbo at once be under-utilized at peak power stock, while the limiting factor on boosted tunes?

        Maybe it can, just strikes me as odd. Now, Cobb have mentioned heat buildup as an issue in the S tune (the 718 has air-to-water intercooler tapping into the main coolant system, and the GTS has an addtl. third radiator in center front duct). So it seems plausible cooling rather than boost (or turbo size) is the constraint on S.

        To your point, I think it possible Porsche over-allocated turbo hardware for the 718 2.5 by tapping the VTG unit from the 911 Turbo/S/GT2, instead letting software set power limits via DME control of boost and variable Aspect Ratio (vane actuation).....and counting on new crypto-code to thwart tuners.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by zuffenhouse Click here to enlarge
        Rather than Porsche conspiring to thwart tuners with VTG, perhaps they went with the best existing technology for the application (single turbo>2.5 liters) and its the after-market tuners who have not yet mastered vane actuation control-loop?
        I think they sized it exactly the way they were supposed to in order to maintain the hierarchy because they do that on every other model.

        GTS tuned tops S tuned for example and both have VTG's.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by zuffenhouse Click here to enlarge
        To your point, I think it possible Porsche over-allocated turbo hardware for the 718 2.5 by tapping the VTG unit from the 911 Turbo/S/GT2, instead letting software set power limits via DME control of boost and variable Aspect Ratio (vane actuation).....and counting on new crypto-code to thwart tuners.
        Maybe. I think Porsche just has the lineup perfectly set stock or modded. It is all by intentional design.