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    • Renntech Stage 1 M157 tune in a 2012 CLS63 AMG runs 11.3@125

      Low 11's with just a tune in warm 85 degree Florida weather? That is what a CLS63 AMG (non-Performance Package) with the Stage 1 Renntech M157 tune just did. The Stage I tune raises boost from the stock 14.5 psi to about the exact same amount as the performance package, 18.8 psi. The vehicle was completely stock except for Nitto NT05 drag radials. Density altitude was just under 2000 feet which means in winter conditions we can realistically expect high 10's out of tune only M157 cars.

      This vehicle belonged to a customer so hard launches / launch control were not used as the 1.8 60 foot validates. This just the beginning of M157 performance tuning and things are off to quite a great beginning.



      This article was originally published in forum thread: Renntech Stage 1 M157 tune in a 2012 CLS63 AMG runs 11.3@125 started by Sticky View original post
      Comments 49 Comments
      1. propain's Avatar
        propain -
        Yes... YES... YES!!! WOW! 11.3 tune only in FL DA with a 1.8 60'!!! Go RENNtech!! Sick times! Possible 10's with big neg DA with a TUNE only!! Throw on some skinny's with some 17's on the back and wow.... I dont want to bench race but damn... the potential is huge for this car.I have been flirting with getting this car for a while now and this just made it a whole lot easier for me. Anyone want to buy a C63? LOL
      1. Sonny's Avatar
        Sonny -
        So, basically, a stock PP M157 CLS 63 has the potential to run very high tens in neg DA with a drag setup.So, the PP E63 will be stupid quick/fast.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by propain Click here to enlarge
        Yes... YES... YES!!! WOW! 11.3 tune only in FL DA with a 1.8 60'!!! Go RENNtech!! Sick times! Possible 10's with big neg DA with a TUNE only!! Throw on some skinny's with some 17's on the back and wow.... I dont want to bench race but damn... the potential is huge for this car.I have been flirting with getting this car for a while now and this just made it a whole lot easier for me. Anyone want to buy a C63? LOL
        Do it! Click here to enlarge

        Those cars are beautiful.
      1. Sonny's Avatar
        Sonny -
        I just used the DA correction calculator on dragtimes and this is what it spit out:

        Extensively Modified Supercharged and Turbocharged Engines11.208 @ 126.025 MPH

        Obviously, the tune-only M157 is not "extensively modified" for the M157 platform. It may, however, be considered "heavily modified" (even though we're just talking a tune here) relative to other car platforms, when you look at the boost that it's pushing and the size/output of the engine.

        Again, it's not heavily modified, but traditionally, cars that put out this much hp/tq are heavily modified. It just happens that the M157 is a monster in stock form.
      1. LZH's Avatar
        LZH -
        that's pretty scary to think what these cars will be running when someone decides to really mod them...10's in a big heavy 4 door sedan is just ridiculous.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by LZH Click here to enlarge
        that's pretty scary to think what these cars will be running when someone decides to really mod them...10's in a big heavy 4 door sedan is just ridiculous.
        Indeed.

        Imagine larger turbos, intercooler (if necessary... not sure about the efficiency of the stock IC), and meth injection on an aggressive map. Wow.
      1. propain's Avatar
        propain -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        I just used the DA correction calculator on dragtimes and this is what it spit out:

        Extensively Modified Supercharged and Turbocharged Engines11.208 @ 126.025 MPH

        Obviously, the tune-only M157 is not "extensively modified" for the M157 platform. It may, however, be considered "heavily modified" (even though we're just talking a tune here) relative to other car platforms, when you look at the boost that it's pushing and the size/output of the engine.

        Again, it's not heavily modified, but traditionally, cars that put out this much hp/tq are heavily modified. It just happens that the M157 is a monster in stock form.
        And thats 0 DA. Calculate for -1200 DA and watch the magic happen. Of course it would correct up but you would still be in the 10's.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by propain Click here to enlarge
        And thats 0 DA. Calculate for -1200 DA and watch the magic happen. Of course it would correct up but you would still be in the 10's.
        I just tried the "-1200" input and it wouldn't do it. The field says "feet about sea level," so maybe that's why... But, I thought there was a feature that could correct down.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        So, basically, a stock PP M157 CLS 63 has the potential to run very high tens in neg DA with a drag setup.So, the PP E63 will be stupid quick/fast.
        This will be slightly faster than a PP E63 as this tune is more aggressive than the PP tune. The E63 is a little lighter as well...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        Indeed.

        Imagine larger turbos, intercooler (if necessary... not sure about the efficiency of the stock IC), and meth injection on an aggressive map. Wow.
        Just a good exhaust is going to be a nice upgrade...
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        This will be slightly faster than a PP E63 as this tune is more aggressive than the PP tune. The E63 is a little lighter as well...
        I don't know... If the boost on this tuned CLS is comparable to the PP cars and given the E63 is hundreds of pounds lighter, I don't think this tuned CLS will be faster than a PP E 63 with the same drag setup as this CLS (i.e., DR's). E 63 should be faster.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Just a good exhaust is going to be a nice upgrade...
        Depends. If you mean manifold-back, then yes, most likely, because you could remove the cats. But if you mean just a catback, then probably not because the E63's stock catback is probably very high flowing.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        I don't know... If the boost on this tuned CLS is comparable to the PP cars and given the E63 is hundreds of pounds lighter, I don't think this tuned CLS will be faster than a PP E 63 with the same drag setup as this CLS (i.e., DR's). E 63 should be faster.
        If the cars have the same tune and setup the E will be faster due to its weight. The PP will be slower than a Stage I as Renntech as they already demonstrated they are gaining power on top of the PP.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        Depends. If you mean manifold-back, then yes, most likely, because you could remove the cats. But if you mean just a catback, then probably not because the E63's stock catback is probably very high flowing.
        I mean a full exhaust which is a great place to gain on turbo cars.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        If the cars have the same tune and setup the E will be faster due to its weight. The PP will be slower than a Stage I as Renntech already demonstrated they are gaining power on top of the PP.
        I understand. And that power gain must come from increasing timing if boost is the same. I don't know the power difference off hand between the PP and the RT stage 1 tune, but the power difference would have to be more than 50 hp/tq (just throwing out a number) to compensate for the difference of several hundred pounds in weight disparity.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I mean a full exhaust which is a great place to gain on turbo cars.
        Absolutely.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        I understand. And that power gain must come from increasing timing if boost is the same. I don't know the power difference off hand between the PP and the RT stage 1 tune, but the power difference would have to be more than 50 hp/tq (just throwing out a number) to compensate for the difference of several hundred pounds in weight disparity.
        You can check it out here: http://www.benzboost.com/showthread.....3bar-18.85psi

        I was told it was not just from timing.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You can check it out here: http://www.benzboost.com/showthread.....3bar-18.85psi

        I was told it was not just from timing.
        Well, what else could it be from?

        On a F/I car, when you're increasing power with just a tune, you can increase power with adjusting the AFR and/or boost. So, if boost is the roughly the same, a power increase would be due to timing.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sonny Click here to enlarge
        Well, what else could it be from?

        On a F/I car, when you're increasing power with just a tune, you can increase power with adjusting the AFR and/or boost. So, if boost is the roughly the same, a power increase would be due to timing.
        See post number 2 in that thread.

        I mentioned in the OP timing as that was the logical correlation and was told that was not the case. I am simply relaying what I was told.
      1. Sonny's Avatar
        Sonny -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You can check it out here: http://www.benzboost.com/showthread.....3bar-18.85psi

        I was told it was not just from timing.
        This is a quote from your article that you linked:

        "This Renntech tune maintains just about the same maximum boost pressure so the gains seem to be coming from more boost down low as well as adjusting the timing."

        I'll still stick with my theory that a tune that increases hp by 20 and tq by 40 will not make up the difference of hundreds of pounds.

        Of course, the proof will be in the actual track times. So we'll see when more time passes and more people get their new cars to the track.

        That said, there are always variables and a RT stage 1 CLS can run quicker/faster than a PP E63, but if you compare the two cars in the same conditions (temp, DA, track prep, and drag setup (like tires), I believe the PP E63 will come out on top.

        Edit: I read your above post after I posted this post.