• Champion Motorsport 997 GT3 RS MKI custom bored and stroked 4.2 liter flat-6 hits 485 wheel horsepower

      PorscheBoost member Lock N Load has been documenting his absolutely jaw dropping 997 GT3 build by Champion Motorsport. In addition to suspension and interior work he chose to have Champion build him a custom 4.2 liter flat-6 motor. Now the 997 GT3 RS MKI was already putting out a healthy amount of power from its 3.6 liter with a baseline of 396 wheel horsepower. That is over 100 wheel horsepower per liter, simply outstanding.

      What did it put out at 4.2 (4.17 to be exact) liters? 485 wheel horsepower for a gain of 89 wheel horsepower. That is all motor folks, simply phenomenal.

      To put this in perspective a factory 997.2 GT3 RS 3.8 puts out 419 wheel horsepower and the 997.2 GT3 RS 4.0 puts out 457 wheel horsepower. This exceeds the 4.0 by almost 30 wheel horsepower and Champion is not finished. They have been testing different sized throttle bodies and trying to get every last pony. With a weight in the 2800 pound range suffice it to say this car is going to move.

      This build gives us a preview of what the next generation GT3 will be able to hit as this is essentially the maximum from the flat-6. Maybe 500 wheel can be cracked but we are reaching the absolute limit. We wish to congratulate Champion Motorsport and our member Lock N Load for this incredible build and the great results so far. Simply phenomenal work.

















      The Baseline:



      After at 4.2 liters:



      GT3 RS 3.8 versus GTR RS 4.0:

      This article was originally published in forum thread: GT3 Ranger / Lock n Load Champion Motorsport 997 GT3 RS 4.2-4.3 liter engine build started by Lock n Load View original post
      Comments 88 Comments
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Lock n Load Click here to enlarge
        Linking from Picasa
        I see, that is the problem.

        Link me to the album I'll take care of it.
      1. Lock n Load's Avatar
        Lock n Load -
        Running (learning) VIR for the first time.



        New exhaust set.
        Click here to enlarge

        Click here to enlarge

        Click here to enlarge

        Latest numbers ... 512 rwhp and 372 rwtq. Not too bad for a NA six banger Click here to enlarge
        Champion is not finished yet.

        Ranger
      1. Sticky's Avatar
        Sticky -
        @Lock n Load

        Ranger, do you have the new graph? I can't believe they keep squeezing power out of that motor.
      1. Lock n Load's Avatar
        Lock n Load -
        I will press the guys on it but it's been crazy fun. I'm tracking the RS about two weekends a month. Champion Motorsport has been awesome. They've taken the RS in there 48' transport to the events (including Virginia) and with 2 to 4 mechanics and the engine builder. All on their dime btw.
        The engine has run flawless. All we need to do is refuel, tweek suspension track dependant and change tires/brake pads.
        I could not be happier with their build and support.
        That new exhaust (Cup Grand Am style) was 100% fabricated in-house.

        Ranger
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Lock n Load Click here to enlarge
        I will press the guys on it but it's been crazy fun. I'm tracking the RS about two weekends a month. Champion Motorsport has been awesome. They've taken the RS in there 48' transport to the events (including Virginia) and with 2 to 4 mechanics and the engine builder. All on their dime btw.
        The engine has run flawless. All we need to do is refuel, tweek suspension track dependant and change tires/brake pads.
        I could not be happier with their build and support.
        That new exhaust (Cup Grand Am style) was 100% fabricated in-house.

        Ranger
        That's what you get with a properly run professional enterprise. Champion is top notch.

        Please press them for it as I'll write up a front page article on it. Free press, not that they need it, but hey Click here to enlarge
      1. Lock n Load's Avatar
        Lock n Load -
        We're off to Sebring this afternoon for the weekend.
        btw checkout the CAE shifter. Google it. It is the BEST H-pattern short shifter ever. They make them for BMW also.

        Ranger
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Lock n Load Click here to enlarge
        We're off to Sebring this afternoon for the weekend.
        btw checkout the CAE shifter. Google it. It is the BEST H-pattern short shifter ever. They make them for BMW also.

        Ranger
        I'll take a look. Have a great weekend Ranger!
      1. leo985i's Avatar
        leo985i -
        Your car is awesome. Please record more videos of it when you get the chance, while driving the beast. Thanks for updating us!