Michael Johnson Associate Editor, 5.0 Mustangs & Super Fords
June 3, 2010
Photos By: Steve Turner

Luckily, we had a back-up plan, which included well-worn Mickey Thompson E/T Street Radials mounted on GT500 wheels. We got the radials from Jeffrey Schmell, and the Roush presented the perfect opportunity to try them out. We sat down, had a sandwich, and bolted on the drag radials. After a couple passes on the radials, we were finally able to get back to where we started. Our last run of the day with me at the wheel was our best time. I launched at 3,000 rpm, and let her eat. I passed the 60-foot marker in 1.794 seconds, the eighth-mile mark at 7.64 at 95 mph, and the quarter-mile mark at 11.71 at 121.66 mph.

Our first pass turned out to be an anomaly since we couldn't even come close to it on street tires, but on drag radials, our performance was much easier to duplicate. With a pair of fresh drag radials, I believe we could've reduced our times by a couple tenths, but we were ecstatic with the 11.70s. To march in a Ford dealership, buy a car, drive it to the track, and run 11.70s at more than 120 mph is amazing.

On the Dyno
After our day at the Gainesville Raceway, we were really curious to see what the Roush 540RH made at the tire. Yes, it carries the 540 designation for a reason, but that is its crank horsepower, not rear-wheel horsepower. We blasted over to Proven Power [(813) 988-DYNO; www.provenpowertampa.com], just a few miles from our Tampa, Florida, office. On the dyno, the Roush 540RH showed 506 horsepower and 475 lb-ft of torque at the wheels! For some reason when Editor Turner imported the dyno files into our Dynojet software it only showed 496, but left the torque number at 475 lb-ft, but either way we are confident in saying the 540RH is good for 500 at the tire. The interesting thing is the Roush's air/fuel ratio. As it turns out, the Roush software is still really safe-as in really, really safe. With just tuning, it would be possible to make 520-530 at the wheels, but we'll let the car's owners make that decision.


5.0 Tech Specs

2010 Roush 540RH

Engine and Drivetrain

Block Iron
Bore 3.552-in.
Stroke 3.543-in.
Displacement 281ci
Rotating Assembly Roush Performance forged crankshaft, forged H-Beam connecting rods, and forged aluminum pistons
Compression Ratio 8.6:1
Camshafts Roush Performance
Heads Roush Performance Three-Valve
Intake Roush Performance
Throttle Body Roush Performance dual 60mm
Mass Air Roush Performance with the company's cold air induction system
Power Adder Roush Performance R2300 ROUSHcharger (featuring TVS technology), intercooled
Fuel System Roush Performance upgrades, and featuring fuel rails, 52-lb/hr injectors
Exhaust Roush
Transmission Stock five-speed
Clutch Roush-upgraded clutch, aluminum flywheel, and short-throw shifter
Rearend Stock 8.8 w/ 3.55 gears, limited-slip differential