2004 360 Challenge-Stradale (US Version) Assembly Number: 50457 Miles: 1157 miles Curb Weight: 3000lb (owners manual) / 3096lb (measured) HP (flywheel): 409 hp / 8500 rpm (owners manual) Torque (flywheel): 275 lb. ft. / 4750 rpm (owners manual) Dyno: Mustang Dyne (DynoAuthority http://www.dynoauthority.com/ ) Measurement Standard: SAE (J1349) Max. HP (rear wheels): 320.4 HP @ 8500 RPM Max. Torque (rear wheel): 233.2 Ft-lbs @ 5750 RPM Parasitic Torque: 32 ft-lbs (measured through coast-down run) Coast-down Loss: 14% Flywheel HP Discussion: 409HP would mean a 21% driveline loss (not reasonable ~15% is standard) 391HP with 18% driveline loss (estimate by operator based on coast-down loss) Possible reasons we dont see claimed HP (besides different standards used): - engine is relative new and still tight - air box RAM effect is not present (may account for 5-10HP) - fuel was US 92 octane I unfortunately do not have the A/F Ratio numbers in digital format since the data logging system did not work. However from watching the numbers it was very visible that the engine did lean out strongly above 7400rpm with the resulting loss in power there is still potential at the high end. I have published the videos of two runs here: http://ferrarichat.com/forum/showthread.php?t=3767 . If you watch carefully you actually see Tim getting frustrated that the car would not go at the top end in the first video and try to nudge it in the second.