5) 603 WHP Turbocharged S2000
Street
Peak Horsepower: 603 WHP
Issue: 158 / September 2015
Excerpt from the article….
On the top end, the focus was to improve the AP2’s volumetric efficiency. The cylinder head was entrusted to URGE Designs, a S2000 specialist. Placing emphasis on improving the head’s port shape and valve seats, the machinists at URGE applied their cylinder head skills. According to URGE, this approach yields a 12 to 18-percent improvement in intake flow and a 25 to 30-percent improvement in exhaust flow. Additionally, URGE’s inconel exhaust valves, dual valve springs and titanium retainers replaced the factory valvetrain.Once Healy received the modified head, he utilized ARP head studs to provide the clamping force to mate the block and head together. Before installing the new powerplant, Healy upgraded to a Clutchmasters FX400 clutch system to transfer power from the engine to the drivetrain. With the car back up and running, the S2000 was strapped to the Dynojet at MAC Autosport. Through the KManager editing software, Nick of MAC Autosport tuned the boost pressure, air-fuel mixture and ignition maps. At 15 psi of boost pressure, the F22C pumped out over 600 horsepower at the wheels with over 430 ft/lbs of torque
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