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: