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    • Porsche 718 Boxster/Cayman S 2.5 liter 9A2B4 McChip-DKR Stage 2 ECU software tune and downpipe dyno results

      This is going to be a fairly common recipe in the 718 Boxster and Cayman S world. A tune and a downpipe, your basic bolt ons. The 2.5 liter 9A2B4 flat-four obviously responds very well to the modifications.


      Factory output is an underrated 350 horsepower. This increases by almost 100 at the crank with the Stage 2 ECU flash plus downpipe:


      Note, this is a catted downpipe:


      Torque rises by 73 lb-ft over stock.

      Also, these are crank ratings but it gives you a good idea of how potent of a package a bolt on 718 S can be.

      This article was originally published in forum thread: Porsche 718 Boxster/Cayman S 2.5 liter 9A2B4 McChip-DKR Stage 2 ECU software tune and downpipe dyno results started by Sticky View original post
      Comments 16 Comments
      1. Stevenh's Avatar
        Stevenh -
        Very nice results. That'll be a solid kick in the pants for a 3,000lb car. I'll assume the 718 GTS will approach 500hp (crank) with basic bolt-ons.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        I'll assume the 718 GTS will approach 500hp (crank) with basic bolt-ons.
        Considering its larger turbocharger I think that is a fair assessment.
      1. axthomson's Avatar
        axthomson -
        The GTS turbo is the same as the S. The Base turbo is similar to that in the Golf R
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by axthomson Click here to enlarge
        The GTS turbo is the same as the S.
        Not according to Porsche's Press Release...
      1. axthomson's Avatar
        axthomson -
        It’s the same VGT with more boost and a new intake plenum design. Only 15 more hp.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by axthomson Click here to enlarge
        It’s the same VGT with more boost and a new intake plenum design. Only 15 more hp.
        Here's what they say: https://www.porscheboost.com/content...365-horsepower

        Click here to enlarge Originally Posted by Porsche Click here to enlarge
        A newly developed intake plenum and an optimized turbocharger increases the output of the 2.5 liter flat-four cylinder engine to 365 horsepower.
        Optimized means just more boost?

        If so, that's a rip off. They implied a turbo upgrade.

        The stated crank HP increase is meaningless.
      1. axthomson's Avatar
        axthomson -
        Apparently the compressor wheel is a bit larger, but besides that, pretty much the same.

        https://www.caranddriver.com/reviews...t-drive-review
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by axthomson Click here to enlarge
        Apparently the compressor wheel is a bit larger, but besides that, pretty much the same.
        Ok, good, that makes more sense.
      1. axthomson's Avatar
        axthomson -
        Someone needs to release some software for the base model. The stock turbo should be good for just under 400 hp with lots of bolt ons, like the Golf R
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by axthomson Click here to enlarge
        Someone needs to release some software for the base model. The stock turbo should be good for just under 400 hp with lots of bolt ons, like the Golf R
        Here's some early results just not from a tuner that is respected: https://www.porscheboost.com/content...results-27-whp
      1. axthomson's Avatar
        axthomson -
        Yeah, don’t trust them. Fabspeed has software too, but I’m a bit Leary on it. I wish APR would make something. Hopefully Cobb or GOAC release something.
      1. Stevenh's Avatar
        Stevenh -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Here's what they say: https://www.porscheboost.com/content...365-horsepower



        Optimized means just more boost?

        If so, that's a rip off. They implied a turbo upgrade.

        The stated crank HP increase is meaningless.
        I'm pretty sure you posted an article a few months back with specs of all the turbos across the 911 and 718 lineup. I think the gts compressor wheels was a few mm larger than the s.
      1. F16HTON's Avatar
        F16HTON -
        Click here to enlarge Originally Posted by axthomson Click here to enlarge
        Yeah, donít trust them. Fabspeed has software too, but Iím a bit Leary on it. I wish APR would make something. Hopefully Cobb or GOAC release something.
        APR is currently hiring software engineers and calibrators for an enhanced Porsche program.

        Gonna take some time...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by F16HTON Click here to enlarge
        APR is currently hiring software engineers and calibrators for an enhanced Porsche program.

        Gonna take some time...
        Very good point. @Arin@APR
      1. cmo93's Avatar
        cmo93 -
        Can someone explain to me why the power falls off pretty bad up top as opposed to the stock tune that seems to at least make peak power at redline. The tune seems to spike super hard, then fall off? or am I looking at that improperly?
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by cmo93 Click here to enlarge
        Can someone explain to me why the power falls off pretty bad up top as opposed to the stock tune that seems to at least make peak power at redline. The tune seems to spike super hard, then fall off? or am I looking at that improperly?
        Both fall off but the fall off is exaggerated with the tune as the turbo is exposed. It just can't hold toward redline at higher boost.