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    • 2021 Porsche 718 Cayman and Boxster GTS models dump 9A2B4 2.5 turbo for 4.0 NA flat-6

      The 982 chassis already received a naturally aspirated 4.0 liter flat-6 in the 718 Spyder and GT4 models. This flat-6 is based on the 9A2B6 architecture which they stretch to 4.0 liters and dump the turbochargers.


      Speaking of turbos, the turbocharged 9A2B4 2.5 liter flat-four is removed in the 718 GTS models now for the new 4.0 liter NA flat-6. That brings the price of entry to get the six-cylinder motor in the 982 chassis down.

      The price is not posted by Porsche however. Considering the 718 GT4 and Spyder are quite close to that $100k mark, the GTS models should come in under $90k. It is not a huge discount but a discount it is.

      The downside? There is no PDK option although it is slated to come later.

      Shifting your own gears while winding out the 4.0 liter motor to 8000 rpm? Sounds like the best Porsche driving experience may just be one of the most affordable in the lineup.












      This article was originally published in forum thread: 2021 Porsche 718 Cayman and Boxster GTS models dump 9A2B4 2.5 turbo for 4.0 NA flat-6 started by Sticky View original post
      Comments 9 Comments
      1. nbrigdan's Avatar
        nbrigdan -
        The perfect sports car. Just hope they don't $#@! up the gearing like the GT4....
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by nbrigdan Click here to enlarge
        The perfect sports car. Just hope they don't $#@! up the gearing like the GT4....
        It's a cheaper and lighter 458 Italia basically.

        Hope it gets the PDK soon. Hard not to like this thing.
      1. nbrigdan's Avatar
        nbrigdan -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        It's a cheaper and lighter 458 Italia basically.

        Hope it gets the PDK soon. Hard not to like this thing.
        Rumour is that both the GTS and GT4/Spyder will get a PDK option in the future.

        Has anyone been able to tune the 718 4L yet? I know that the old 3.8 in the 981 GT4 was able to do around 450 BHP with Fabspeed's performance package. I imagine the new 4.0 should be able to one up the motor significantly, maybe make 475 - 500 BHP N/A?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by nbrigdan Click here to enlarge
        Has anyone been able to tune the 718 4L yet? I know that the old 3.8 in the 981 GT4 was able to do around 450 BHP with Fabspeed's performance package. I imagine the new 4.0 should be able to one up the motor significantly, maybe make 475 - 500 BHP N/A?
        I see no reason they won't get some power out of this motor as it's not as high strung as the GT3.

        No tuning yet, these things will be rare and I don't know of anyone who has one yet.
      1. donR's Avatar
        donR -
        The 450hp Fabspeed Performance package was with no CATS, it was 420hp for the catted street version.

        But I'm sure Fabspeed will be out with a performance package for the 4.0. I found Fabspeeds claims a bit confusing but my understanding was on the old 981 spyder the catted GT420 package added

        + 44 whp and +48 ft/lbs, so it might bring the 982 4.0 up to near 450hp and 358ft/lbs (470hp on the catless race version), which would be a nice improvement.

        But then APRs stage 1 tune for the GTS 2.5t creates a dilemma with:

        442hp and 412ft/lb or 460hp on race fuel, which is a massive jump in hp & torque for only $1200 US

        I think the Fabspeed package was around $9000US!
      1. nbrigdan's Avatar
        nbrigdan -
        Click here to enlarge Originally Posted by donR Click here to enlarge
        But then APRs stage 1 tune for the GTS 2.5t creates a dilemma with:

        442hp and 412ft/lb or 460hp on race fuel, which is a massive jump in hp & torque for only $1200 US

        I think the Fabspeed package was around $9000US!
        The price of natural aspiration. Freer revs, an engine more suited to the chassis and catering to the purist.

        Honestly the biggest argument against it is a 718 T. Almost all the same equipment from the 718 GTS 2.5T but lighter and makes almost the same power (as a tuned 2.5 GTS) with a $1000 tune from APR. Similar power is made due to the weak cooling on the GTS / S / Base models resulting in a relatively low ceiling for tuning the engines.
      1. donR's Avatar
        donR -
        Click here to enlarge Originally Posted by nbrigdan Click here to enlarge
        The price of natural aspiration. Freer revs, an engine more suited to the chassis and catering to the purist.

        Honestly the biggest argument against it is a 718 T. Almost all the same equipment from the 718 GTS 2.5T but lighter and makes almost the same power (as a tuned 2.5 GTS) with a $1000 tune from APR. Similar power is made due to the weak cooling on the GTS / S / Base models resulting in a relatively low ceiling for tuning the engines.
        I agree the 718 T or the 718 base with the performance options is the value proposition.

        Although Stage 1 in the base is similar to the standard S, so very close to the stock S. The tuned 2.5T GTS is quite a leap ahead of the stage 1 base.

        APR quotes 366hp and 334 ft/lbs for the stage 1 base, which is very close to the standard S at 376hp & 330 ft/lbs. The stock 2.5t GTS is 382hp & 355 ft/lbs stock (APR figures).

        It will be interesting to see what the 4.0 GTS actually reads on the dyno, no doubt a bit more than what Porsche is saying.

        But I think you are right, a stage 1 718 T with PDK is arguably fast enough and best bang for your buck.

        I also don't see them improving the gearing in the manual 718s, same complaints in the 718 GT4 as with the old GT4, but when they release it with PDK the gearing issues will be fixed.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by donR Click here to enlarge
        I think the Fabspeed package was around $9000US!
        You'll never get the hp per dollar ratio tuning a high strung naturally aspirated motor as you will a turbo motor.
      1. nbrigdan's Avatar
        nbrigdan -
        Click here to enlarge Originally Posted by donR Click here to enlarge
        Although Stage 1 in the base is similar to the standard S, so very close to the stock S. The tuned 2.5T GTS is quite a leap ahead of the stage 1 base.

        APR quotes 366hp and 334 ft/lbs for the stage 1 base, which is very close to the standard S at 376hp & 330 ft/lbs. The stock 2.5t GTS is 382hp & 355 ft/lbs stock (APR figures).
        Definitely, I was going off COBB's numbers:

        Our Stage 1 Off The Shelf Map is good for 346 HP and 326 TQ on 93 octane fuel.

        With a slight increase in boost pressure, we saw results of 378 HP and 353 TQ to the wheels.
        So 32 WHP / 27 lb-ft difference? Considering a base car weighs about 90 lbs less than a GTS, advantage definitely goes to the GTS but power to weight is still damn close.

        GTS: 3031 / 378 = 8.08 lbs/whp

        Base: 2943 / 346 = 8.51 lbs/whp

        Can't wait to see how the 4.0 stacks up.