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    • Porsche turbo four-cylinder Boxer engine will be based on modular flat-6 architecture and offer up to 395 horsepower - 981 Cayman/Boxster Turbo

      Things are getting very competitive in the turbo four-cylinder performance market. Porsche is throwing their hat in the ring. We have known about Porsche developing a new four-cylinder boxer engine for some time and now we have some concrete details. The entry level Macan will likely get this motor in a lower state of tune but the Cayman and Boxster will also get a derivative with reportedly up to 395 horsepower. That will certainly make the mid-engine Porsche sports cars outperform the 911 Carrera and also potentially the Carrera S.


      Porsche will not give the Cayman and Boxster the larger 3.8 liter flat-6 obviously to protect the 911. Their way around this may be to put a small four-cylinder in the Cayman and Boxster so 911 owners will still have their perceived superiority with a bigger six-cylinder motor. The boxer four will be based on the flat-6 meaning Porsche can assemble these motors on the same production line.

      If PorscheBoost were to guess the bore and stroke of the 911 Carrera will be retained allowing pistons and rods to be shared for lower costs meaning a 97mm bore and 77.5mm stroke. This means a potential displacement of 2290cc's or roughly 2.3 liters. Porsche could use the Carrera S bore of 102mm taking displacement to 2533cc's or 2.5 liters. A range of 2.3-2.5 liters for the new motor is what we are looking at.

      Porsche CEO Matthias Muller in an interview stated the output of the motor will be 'up to 395 horsepower' meaning Porsche would have the most powerful production four-cylinder in the world. Audi is going to produce a four-cylinder somewhere in the 375+ horsepower range in order to take that title from Mercedes. Porsche could potentially beat them both with their own design which likely will be a larger four-cylinder than the other German competition.

      It looks like the Boxster and Cayman may finally get the power and torque their chassis have been craving for.

      Source
      This article was originally published in forum thread: Porsche turbo four-cylinder Boxer engine will be based on modular flat-6 architecture and offer up to 395 horsepower - 981 Cayman/Boxster Turbo started by Sticky View original post
      Comments 11 Comments
      1. whoosh's Avatar
        whoosh -
        This has been discussed at length on the Cayman forums, and it's amazing to me how many people are scrambling to save for/buy one of the last "pure" 981 cars before they go to the 4 cylinder. The 4-pots definitely won't sound the same as the 6, but in the end, it should make for a better car overall with less weight and enough power to really exploit the chassis. I can't wait to drive one.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by whoosh Click here to enlarge
        This has been discussed at length on the Cayman forums, and it's amazing to me how many people are scrambling to save for/buy one of the last "pure" 981 cars before they go to the 4 cylinder. The 4-pots definitely won't sound the same as the 6, but in the end, it should make for a better car overall with less weight and enough power to really exploit the chassis. I can't wait to drive one.
        I wouldn't scramble for the six plus they aren't saying the six will no longer be offered.

        If this was available now I'd take it over the neutered flat-6.
      1. onisyndicate's Avatar
        onisyndicate -
        Yes and we can hear Porsche sound like a bunch of pissed of bumble bee's when drive by like the hondas! LMFAO

        Sorry had to say it.

        Good for them if they produce a 4 cylinder that makes that kind of horsepower though!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by onisyndicate Click here to enlarge
        Yes and we can hear Porsche sound like a bunch of pissed of bumble bee's when drive by like the hondas! LMFAO

        Sorry had to say it.

        Good for them if they produce a 4 cylinder that makes that kind of horsepower though!
        Why does it have to sound bad?

      1. onisyndicate's Avatar
        onisyndicate -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Why does it have to sound bad?

        http://www.youtube.com/watch?v=i15zcCeoDG8
        Nothing as long as it doesn't sound like a pissed off bumble bee! Click here to enlarge
      1. whoosh's Avatar
        whoosh -
        I doubt it will sound like a Honda, although I like the way my S2K sounds even with the bee exhaust. At least from 6.5k up to 9k. Click here to enlarge

        the boxer layout will definitely change the tone, as will their header and turbo configuration. Does anyone know yet whether this will be single or twin setup? I would imagine twins just because that's what they tend to do with everything, and the flat configuration favors twins.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by whoosh Click here to enlarge
        I doubt it will sound like a Honda, although I like the way my S2K sounds even with the bee exhaust. At least from 6.5k up to 9k. Click here to enlarge

        the boxer layout will definitely change the tone, as will their header and turbo configuration. Does anyone know yet whether this will be single or twin setup? I would imagine twins just because that's what they tend to do with everything, and the flat configuration favors twins.
        Don't know if it is single or twins yet. I would think single probably but who knows.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Subaru Flat 4 = WORST sounding exhaust not in the automotive aftermarket. I literally cannot stand it. The Porsche will hopefully not sound like it, but not crossing my fingers. A boxer 4 sounds like a boxer 4
      1. xbox_fan's Avatar
        xbox_fan -
        I think a 395hp 4-cyl boxer engine in the Cayman sounds like one of the best ideas ever. I had a 2014 Cayman S for a week while the turbo was at the dealer, and that was prob the most fun, well balanced car I driven. It lacked the raw power of the turbo but a 550Nm 400hp engine would solve that.
      1. Nugs's Avatar
        Nugs -
        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        Subaru Flat 4 = WORST sounding exhaust not in the automotive aftermarket. I literally cannot stand it. The Porsche will hopefully not sound like it, but not crossing my fingers. A boxer 4 sounds like a boxer 4
        I don't think it will sound like a WRX unless they go with unequal length headers.
      1. whoosh's Avatar
        whoosh -
        Click here to enlarge Originally Posted by Nugs Click here to enlarge
        I don't think it will sound like a WRX unless they go with unequal length headers.
        Correct. Subaru rumble is due to the pulsing exhaust from the unequal length headers. The '15+ WRX now has equal length headers, but the STI retains the UEL.

        Length of the piping will be a factor as well. Given the mid-engine placement, the Cayman with a flat four should still sound less boomy than a Honda or Subaru.