• 2013 R231 SL65 AMG with updated M279 V12 tested - Pointless?

      The SL65 AMG served a purpose with the R230 SL generation as it offered a performance boost over the SL55 and SL63 AMG variants. With the R231 generation however the SL63 AMG received the twin turbo M157 motor making the M279 V12 somewhat redundant despite its 621 horsepower and 738 pound-feet of torque. The M157 powered SL63 AMG by contrast has an output 530 horsepower and 590 pound-feet of torque. This output rises to 550 horsepower and 663 pound-feet of torque with the optional Performance Package.


      Yes, the updated M279 V12 in the SL65 AMG has more power and torque but the car also weighs about 230 pounds more with the majority of that weight coming on the nose. Is the weight penalty worth it? According to the handling and acceleration data from Car and Driver, no. The 1/4 mile comes by 11.8 seconds at 124 miles per hour. In other words, basically a wash with the Performance Package SL63 AMG which is lighter and $60k cheaper. Ouch.

      AMG updated the V12 but it's still a relatively ancient design. Low revving, SOHC, and just a stump puller versus the lighter, higher revving, and better breathing M157. BenzBoost hates to say it, but, the SL65 AMG just does not make sense any longer. Grab an SL63 AMG and save the pocketed change for some upgraded turbos. You'll have a more powerful and more fun car to drive.



      This article was originally published in forum thread: 2013 R231 SL65 AMG with updated M279 V12 tested - Pointless? started by Sticky View original post
      Comments 26 Comments
      1. 65AMG's Avatar
        65AMG -
        From my research the new SL65 uses the M275-BS-Turbos and manifolds. Also different intercooler pump from Pierburg.

        At least at higher speeds on the Autobahn the new SL65 (stock) should be faster than SL63 (stock). Normally AMG sets the HP-figures in each model very carefully, not to disappoint the customers of the Top-Model.

        In my opinion the super-smooth and powerful V12 is a complete different car from the engine and also from the interiour and even don't need a launch control like the SL63. I don't think you will miss it in this car.

        On the other hand : Whats the worth of 0,1 or 0,2 sec. from 0-60 in real world driving? Don't think it is so important...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 65AMG Click here to enlarge
        From my research the new SL65 uses the M275-BS-Turbos and manifolds. Also different intercooler pump from Pierburg.

        At least at higher speeds on the Autobahn the new SL65 (stock) should be faster than SL63 (stock). Normally AMG sets the HP-figures in each model very carefully, not to disappoint the customers of the Top-Model.

        In my opinion the super-smooth and powerful V12 is a complete different car from the engine and also from the interiour and even don't need a launch control like the SL63. I don't think you will miss it in this car.

        On the other hand : Whats the worth of 0,1 or 0,2 sec. from 0-60 in real world driving? Don't think it is so important...
        Welcome.
      1. 65AMG's Avatar
        65AMG -
        According to Modding-Potential the M275/M279 is not that bad in my opinion. Only depends on money and find a good tuner who spend knowledge and love in these V12-Engines. It can be done. Maybe the market for BIG-Power is not big enough for these cars...


        Of course M157 guys have it easier, since many companies are developing on the Garrett based Engines now...

        Thanks for the welcome sticky...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 65AMG Click here to enlarge
        According to Modding-Potential the M275/M279 is not that bad in my opinion. Only depends on money and find a good tuner who spend knowledge and love in these V12-Engines. It can be done. Maybe the market for BIG-Power is not big enough for these cars...


        Of course M157 guys have it easier, since many companies are developing on the Garrett based Engines now...

        Thanks for the welcome sticky...
        The V12 of course has capability but with the more modern design of the M157... well, it makes more sense especially considering how much lighter it is and how it revs higher.
      1. 65AMG's Avatar
        65AMG -
        Agree. The M157 is the more modern engine design.

        For me the Rev-Range in the V12 is still big enough to get some serious results on the streets. Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 65AMG Click here to enlarge
        Agree. The M157 is the more modern engine design.

        For me the Rev-Range in the V12 is still big enough to get some serious results on the streets. Click here to enlarge
        Absolutely.