We recently talked about Harrop Engineering's Godzilla 7.3-liter truck engine build and dyno test, and part 1 of the build series concluded with Ford's latest HD truck engine churning out 803 horsepower and 789 lb-ft of torque with 11 psi of boost pressure from a pre-production, TVS 2650-based, Harrop Engineering supercharger complemented with a healthy does of pump gasoline. It didn't take long for them to eclipse those marks, and by a large margin as well.
Check out the full story and video on part 1 of the build. The Australia-based Harrop Engineering worked with Dandy Engines on the dyno testing, and employed a FuelTech EFI system to manage the engine and give them a good bit more freedom when tuning the engine calibration.The 7.3-liter Godzilla engine used for this test remains completely stock aside from the supercharger, a GT350 throttle body, long-tube headers, and the engine management system. Changing the fuel diet to E85 and turning the boost up to 18 psi increased power to 944 horsepower and a whopping 972 lb-ft of torque. A 102mm throttle body opened up the intake tract a bit, resulting in 19 psi of boost and 980 horsepower, with 980 lb-ft of torquenearly 40 horsepower from a throttle body! Further tuning and 20 psi of boost pressure netted a final tally of 1,015 horsepower and 988 lb-ft of torque. Check out part 2 of the video build series below:
Harrop Engineering isn't done yet, so keep checking back here for more engine test updates.