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    • Swapping Porsche 991.2 X51 (GTS) turbochargers onto the base 2017 911 Carrera 9A2 3.0

      Porsche cutting costs and introducing turbochargers to the base 911 Carrera models creates a very interesting tuning opportunity. With the previous 991.1 generation 911 models one could not retrofit the X51 power kit from the Carrera S/GTS to the Carrera.


      Why? Because the S and GTS models utilized a naturally aspirated 3.8 liter flat-6 whereas the Carrera made due with a 3.4 liter unit. The X51 kit included new heads and cams that simply did not apply.

      They also did not provide much power for $18,5000 and the gains all came up top. With the 991.2 generation the Carrera, S, and GTS all share the same 9A2 3.0 engine.

      These specifications were previously detailed:

      9A2 3.0 991.2 Carrera


      Horsepower: 370
      Torque: 332 lb-ft
      Boost Pressure: 13.1 psi
      Bore x Stroke: 91mm x 76.4mm
      Redline: 7500 rpm
      Compression Ratio: 10.0:1
      Intercooler: Air to Air
      Turbos: 49mm compressor/45mm turbine

      9A2 3.0 991.2 Carrera S

      Horsepower: 420
      Torque: 369 lb-ft
      Boost Pressure: 16.0 psi
      Bore x Stroke: 91mm x 76.4mm
      Redline: 7500 rpm
      Compression Ratio: 10.0:1
      Intercooler: Air to Air
      Turbos: 51mm compressor/45mm turbine

      9A2 3.0 991.2 Carrera GTS

      Horsepower: 450
      Torque: 405 lb-ft
      Boost Pressure: 18.0 psi
      Bore x Stroke: 91mm x 76.4mm
      Redline: 7500 rpm
      Compression Ratio: 10.0:1
      Intercooler: Air to Air
      Turbos: 55mm compressor/48mm turbine

      The hardware will work on any of the models as the engines are the exact same thing. Porsche just changes the turbos and software themselves.

      If you want the GTS turbochargers, Porsche will sell you them for $7500 along with the software to make them work and they back the power kit with the factory warranty.

      The only catch? You must have a 991.2 Carrera S. The Porsche dealer will not do the swap if you have a base car even though the turbos will obviously work.

      Why does Porsche do this? Because who is going to buy an S or a GTS if you can just order a base car for tens of thousands less and just add the turbos and software in? Well, that is why I opted for a base car.

      The problem is doing this swap without Porsche's blessing. After speaking with a Porsche dealer, they sternly said they will not do it. While the hardware will fit Porsche forces dealers to get their approval in Germany before whatever necessary software codes are released. You also need an S vin number.

      If you do this swap onto a base car you will lose your warranty and also will not have factory tuning software. Oh darn.

      PorscheBoost is going to try to make this swap happen. The part numbers will be available soon and a source stated the turbochargers alone from Germany can be had for roughly $3200 each. That means undercutting the hardware cost from Suncoast to $6400 rather than $7500.

      In theory, an aftermarket tune should be able to make the new hardware play nicely. The problem is that nobody has any real tuning solutions for different hardware. There may be enough leeway in the factory parameters to make it happen.

      Speaking with GIAC (the only company that has a flash tune for the platform) they said they have yet to read out a 991.2 GTS. A solution might be to try to flash the GTS software to a standard car. Maybe even an ECU swap will work.

      Either way, PorscheBoost will explore this option and report back after a meeting with GIAC. It is only a matter of time before you will be able to have 991.2 GTS hardware with far more tuning headroom on a base 991.2.

      This article was originally published in forum thread: Swapping Porsche 991.2 X51 (GTS) turbochargers onto the base 2017 911 Carrera 9A2 3.0 started by Sticky View original post
      Comments 12 Comments
      1. Surquhar's Avatar
        Surquhar -
        I don't see why the GIAC S flash wouldn't work with these GTS turbos. I'm very interested in this as well.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Surquhar Click here to enlarge
        I don't see why the GIAC S flash wouldn't work with these GTS turbos. I'm very interested in this as well.
        Yeah but can you just put the S flash into a standard ECU without issue? Essentially cloning it?
      1. Surquhar's Avatar
        Surquhar -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Yeah but can you just put the S flash into a standard ECU without issue? Essentially cloning it?
        Good point. I would think GIAC would work with you on a custom tune for these.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Surquhar Click here to enlarge
        Good point. I would think GIAC would work with you on a custom tune for these.
        Who knows. We'll see.
      1. quattr0's Avatar
        quattr0 -
        Man, you gents moving fast...Thanks for the lead!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Man, you gents moving fast...Thanks for the lead!
        When the ability to gain a ton more power and torque is basically provided by the factory... impossible to resist.
      1. Bowser330's Avatar
        Bowser330 -
        Simple bolt-on upgrades can make the base engine respond like a tuned GTS....This is great!

        Base 911's always take more of a depreciation hit because more people want the "S" for status rather than sport. So there will be some great deals to be had in the next few years...

        I would like to represent all tuning tuning laggards by saying thank you!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Bowser330 Click here to enlarge
        Base 911's always take more of a depreciation hit because more people want the "S" for status rather than sport. So there will be some great deals to be had in the next few years...
        There won't be as big of a hit now as they all have the same motors. Previously, the S had a larger engine which in part was why it held so well.

        Base cars will be more desireable than ever before.
      1. John Mclane's Avatar
        John Mclane -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Who knows. We'll see.
        Not only that, it's not far fetched that Porsche is holding back even further than this base/S/GTS. It wouldnt be the first time that the X51 makes it's way to standard on the S model. There might be some turbos up the chain for the "new" 992, which is far cheaper than "updating" the engine (I quoted bc I dont think Porsche engineers stuff more than once per cycle, it's all thought for the 7 years cycle-with the exception of messes like the last GT3 engine debacle). If so, BW might have them already. Matter of asking the turbo factory...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by John Mclane Click here to enlarge
        Not only that, it's not far fetched that Porsche is holding back even further than this base/S/GTS. It wouldnt be the first time that the X51 makes it's way to standard on the S model. There might be some turbos up the chain for the "new" 992, which is far cheaper than "updating" the engine (I quoted bc I dont think Porsche engineers stuff more than once per cycle, it's all thought for the 7 years cycle-with the exception of messes like the last GT3 engine debacle). If so, BW might have them already. Matter of asking the turbo factory...
        I think you're absolutely right. The 992 is just going to be the same engine with minimal upgrades.

        Tried explaining this to some of the old guys on another forum but they don't get it.
      1. John Mclane's Avatar
        John Mclane -
        The way I see it, 992 base will be about 400hp, maybe the current S turbo in it, most likely only ECU remapping
        992S will be around 440, probably the current GTS turbo in it
        992 GTS, either the same turbo as the S or slightly different inner components. Probably RWS as standard. some 470.

        Just see what they have been acting the last 15 years. The "new" model keeps the prior .2 mechanics with a little bump in hp, the next .2 model gets new mechanics compared to the .1 . X51 becomes standard on the subsequent S model.

        The TT can get away with tuning only, will need a hefty bump in power to stay away from the above models. Water injection is likely too cumbersome for DD/street cars.

        The next platform allows for a small hybrid linked to the transmission, Porsche denies it then says it will happen. With the new Panamera turbo hybrid out, they will probably trickle it to the TT, keeping it away from the Carrera, but penalizing weight significantly.

        There's so much they can fiddle with the engine/transmission as they try to grow all models hp. Eventually they wont be able to fit 5 levels of performance between 370-610 hp as the lower hp (carrera base) gets proportionally a bigger bump than the TTS, so I believe that the materials used in the cars will be part of the difference. Sometimes I think Porsche is more concerned about internal competition between the 911 models than competition from other brands.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by John Mclane Click here to enlarge
        Just see what they have been acting the last 15 years. The "new" model keeps the prior .2 mechanics with a little bump in hp, the next .2 model gets new mechanics compared to the .1 . X51 becomes standard on the subsequent S model.
        Exactly right. They slot it all in almost too perfectly. Very artificial but we know what they're doing.

        With these turbo motors we can jump ahead easily Click here to enlarge

        Click here to enlarge Originally Posted by John Mclane Click here to enlarge
        Sometimes I think Porsche is more concerned about internal competition between the 911 models than competition from other brands.
        Absolutely true.