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    • BigBoost Stage 2 W205 Mercedes-AMG C63 M177 turbo upgrade produces 636 wheel horsepower before tuning

      BigBoost sure is expanding their turbo upgrade portfolio over a variety of platforms. The 4.0 liter M177 AMG motor is now receiving their attention and their Stage 2 turbocharger upgrade for the W205 Mercedes-AMG C63 shows impressive numbers early on.


      This is before a tune folks. Just with the factory programming the Stage 2 BigBoost upgrade makes 636 rear wheel horsepower and 699 lb-ft of torque at the rear wheels. The torque figure is insane.


      Full details from @Juan@BigBoost-Billet below.

      Quote Originally Posted by Juan@BigBoost-Billet
      I'm happy to announce that our M177 stage 2.5 turbo upgrade testing has began. The first tests were done just on turbos, downpipes and intakes. We will tune the ECU and soon we'll have more results.

      Please note this is still a beta stage, in about 8 to 10 weeks we will have billet 7-blade compressor wheels, lightweight shaft and turbine that will fit on the OEM center section and housings, making this a bolt-on turbo upgrade!

      This was achieved on 93 octane fuel, at the stock boost levels (Peak 17.8 psi drop to around 12 psi) without any transmission tune nor upgrade. The car has OEM cat-back exhaust, stock watercoolers (Intercoolers) and stock ECU tune.

      How about 636 WHP and 699 lb-ft of torque? This car is amazing on the street!

      This article was originally published in forum thread: 636 WHP BigBoost stage 2.5 turbos, No Flash Tune! started by Juan@BigBoost-Billet View original post
      Comments 15 Comments
      1. lfelunden's Avatar
        lfelunden -
        Crazy!

        Would be nice to see the graph before and after the turbos, seems a little too high for turbos only.
      1. Juan@BigBoost-Billet's Avatar
        Juan@BigBoost-Billet -
        Sure, I'll post the baseline later, it was 463 WHP.
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        Looks good.
      1. Stevenh's Avatar
        Stevenh -
        175whp/35+% gain with no change in boost or tune? Huh?
        You're going to have to provide a lot more data if you want me to believe that. Just because you didn't change the boost via tune doesn't mean the ecu isn't confused or unintentionally running more.
      1. Juan@BigBoost-Billet's Avatar
        Juan@BigBoost-Billet -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        175whp/35+% gain with no change in boost or tune? Huh?
        You're going to have to provide a lot more data if you want me to believe that. Just because you didn't change the boost via tune doesn't mean the ecu isn't confused or unintentionally running more.
        We also changed downpipes and intakes. Also with 5mm more in the compressor and 6mm in turbine do make a big change.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Juan@BigBoost-Billet Click here to enlarge
        Sure, I'll post the baseline later, it was 463 WHP.
        I'd like to see the baseline as well.
      1. Blown6's Avatar
        Blown6 -
        Wow a turbo upgrade, cat removal, and filters with no tune.

        Must be a super smart adaptive mercedes ECU I never heard of LOL
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Blown6 Click here to enlarge
        Wow a turbo upgrade, cat removal, and filters with no tune.

        Must be a super smart adaptive mercedes ECU I never heard of LOL
        Come on man they are working on the tune as well... this is just an early update which is appreciated.

        Great results so far, right?
      1. Blown6's Avatar
        Blown6 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Come on man they are working on the tune as well... this is just an early update which is appreciated.

        Great results so far, right?
        Yes, more power it seems.

        My comment was geared more toward safety, IMHO that motor may have knocked or went lean on boost while the ecu tried to figure out whats up! I would not hammer the engine on a dyno when making considerable air changes without some form of control or tune.

        Usually when changing cat backs or filters not a problem usually, however when removing cats and especially when upgrading turbos it needs a tune ASAP if on boost.
      1. Juan@BigBoost-Billet's Avatar
        Juan@BigBoost-Billet -
        Click here to enlarge Originally Posted by Blown6 Click here to enlarge
        Yes, more power it seems.

        My comment was geared more toward safety, IMHO that motor may have knocked or went lean on boost while the ecu tried to figure out whats up! I would not hammer the engine on a dyno when making considerable air changes without some form of control or tune.

        Usually when changing cat backs or filters not a problem usually, however when removing cats and especially when upgrading turbos it needs a tune ASAP if on boost.
        The engine did not knock neither went lean on that run, we really care about that, we don't mess around. We did a tune and the car made 684 WHP, 12.5 AFR and 19 PSI of boost.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Juan@BigBoost-Billet Click here to enlarge
        did a tune and the car made 684 WHP, 12.5 AFR and 19 PSI of boost.
        Graph?
      1. Juan@BigBoost-Billet's Avatar
        Juan@BigBoost-Billet -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Graph?
        Let me get it tomorrow
      1. Stevenh's Avatar
        Stevenh -
        Click here to enlarge Originally Posted by Juan@BigBoost-Billet Click here to enlarge
        The engine did not knock neither went lean on that run, we really care about that, we don't mess around. We did a tune and the car made 684 WHP, 12.5 AFR and 19 PSI of boost.
        So you're telling me I could add these stock housing turbos, no other mods, no tune, and the car will be absolutely stock in the eyes of the dealer/manufacturer, it will run perfectly and make 100+whp more? Seems too good to be true. I still don't see how an ECU could reactively add enough fuel without any knock or running lean for this level of power gain.
      1. Juan@BigBoost-Billet's Avatar
        Juan@BigBoost-Billet -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        So you're telling me I could add these stock housing turbos, no other mods, no tune, and the car will be absolutely stock in the eyes of the dealer/manufacturer, it will run perfectly and make 100+whp more? Seems too good to be true. I still don't see how an ECU could reactively add enough fuel without any knock or running lean for this level of power gain.
        These are not factory housing turbos, ECUs will keep an AFR target so they will add fuel to reach it. I don't see why wouldn't it run good. AFR on the 636 run was 13.1, which is factory target.
      1. Juan@BigBoost-Billet's Avatar
        Juan@BigBoost-Billet -
        Hey,

        As asked this is the 689 WHP graph. 5th and 6th gear!

        Attachment 55121