SSC Ultimate Aero XT specification

SSC Ultimate Aero XT - the special edition to celebrate and end the production run of the model. The XT will be built in a limited run of just five examples and will utilize some key assemblies that will feature in the Tuatara, for instance, SSC's proprietary developed 6.9 litre all-aluminum twin-turbo V8 engine unit and several other features to go along with the new engine unit such as enhanced cooling, transmission upgrades as well as a seven-speed paddle-shifted gearbox.
Technical specification (official manufacturer numbers)

• Engine - SSC proprietary Billet Aluminum 423.6 cubic-inch / 6.94 litre Twin-Turbo V8
• Horsepower - 1,300 bhp (969 kW; 1,318 PS) @ 6800 rpm
• Torque - 1,361 N·m (1,004 lb·ft) @ 6800 rpm
• Redline - 9200 rpm
• Max Speed - 275 mph /443kmh
• Drag Coefficient - 0.357
• Dry Weight - 2,800 lbs. = 1270 kg.

Speed attempt

SSC tested the top speed capability of the Ultimate Aero TT on March 22, 2007. The original test was scheduled for March 21 2007 but was called off due to bad weather conditions. SSC closed down a 12-mile (19 km) stretch of U.S. Route 93 in Nevada for the event. Their goal was to replace the Bugatti Veyron as the fastest production car ever produced, which at the time could achieve 253.7 mph (408.3 km/h). Simulation and testing at NASA's Virginia facility had shown that the Ultimate Aero TT is theoretically capable of approximately 273 mph (439 km/h). The March 22nd attempt failed to break the record, due to sub-optimal conditions. Test driver Rick Doria reported "wheel-spin" at speeds above 190 mph (310 km/h).
SSC announced they had broken the speed record for the world's fastest production car with 256.18 mph (412.28 km/h) in West Richland, WA on September 13, 2007. The reported record speed came from an average of two runs in opposite directions, in accordance with FIA Speed Records rules. The first run clocked 257.44 mph (414.31 km/h) and the return trip 254.91 mph (410.24 km/h). The results of this test, verified by Guinness World Records on October 9 2007, gave the SSC Ultimate Aero the title of world's fastest production car, with a top speed of 256.18 mph (412.28 km/h). This beat the previous record holder, the Bugatti Veyron, that had a top speed of 253.81 mph (408.47 km/h).
In addition to the fastest production car record, SSC also applied for the world record for the highest power for an emissions-legal production automobile.
The record-breaking 2007 Shelby SuperCars Ultimate Aero Chassis #TT-02 was later put into auction by Shelby SuperCars, which also included SSC World Record commemorative watch, key fob, original record-breaking wheels and tires, framed official Guinness World Records certificate with commemorative photo signed by Shelby SuperCars team.
The car's record was broken on July 4, 2010 by the Bugatti Veyron Super Sport, which reached a certified top speed of 431.00 km/h (267.81 mph).