Koenigsegg has built just over 100 cars since it began production out of a converted fighter jet hangar in 2003. Each car is hand-built to exacting specifications and excruciating detail at Koenigsegg’s factory in Ängelholm, Sweden. The One:1, pronounced as a ratio (“one-to-one”), is the company’s most radical accomplishment thus far. The strange name is representative of the nearly inconceivable 1:1 power to weight ratio. That’s 1341 hp (when running on E85) in a vehicle that weighs just 1360 kg with all fluids and a half tank of fuel. The One:1 will see its driver from 0 to 250 mph in just 20 seconds and can theoretically reach a 273 mph top speed – take it for a spin and try hitting that mark yourself. This rocket ship with wheels intends to set a new lap record at the Nürburgring once management at the famous racing venue allows lap records to be set again. With each of the six $2.4 million hypercars already sold, getting a hand on the wheel of this ultra-exotic in Forza Motorsport 6 is the closest the rest of us may ever get.
The One:1 is Koenigsegg's top-range model in the Agera model line, with the clear goal of being the fastest car around the track and in speed, with a top speed of 273 mph (440 km/h) even while having among the sharpest cornering forces of any road car. The One:1's name is derived from its equal ratio of metric horsepower (PS) to kilogram weight (kg), leading it to become known as the first "megacar".
It is also one of the most exclusive hypercars ever made, with only seven units made, including a prototype, each priced at over US$2.4 million.
The Koenigsegg One:1 is powered by a 5.0 L (5,032 cc) twin-turbocharged V8 engine with 1341 hp (1000 kW) at 7,500 rpm and 1311 ft·lb (1777 N·m) at 6,000 rpm, with a redline set to 8,250 rpm and a fuel cutoff point of 8,500 rpm, although the Forza renditions of the car have an incorrect displacement of 5.1 L (5,065 cc). It has a compression ratio of 9.0:1 has a bore and stroke of 92×95.25 mm. The engine produces 26.1 psi (1.8 bar) of boost and weighs only 434 lb (197 kg).
To support the 1 megawatt (MW) of power, the One:1 features large air vents for improved cooling and a roof air scoop that sits on the removable roof, making it impossible to stow the roof into the boot unlike previous models. Koenigsegg took advantage of this to model the front to create more downforce, reducing boot capacity by 40%. 1345 lb (610 kg) of downforce is generated at 162 mph (260 km/h) and 1830 lb (830 kg) at 273 mph (440 km/h).
The transmission used is a rear-driving, specially developed seven-speed dual-clutch, single input shaft automatic transmission with paddle shifters located behind the steering wheel. An electronic differential is also used.
It is built on an advanced carbon fiber chassis with Formula One-stle honeycomb core and integrated fuel tanks for optimal weight distribution and safety, resulting with 44% front weight distribution. Double wishbone suspensions, active ride height control, and rear triplex dampers are used. The car weighs 2998 lb (1360 kg), resulting in a power-to-weight ratio of 986 hp (735 kW) per tonne or 1 metric horsepower (PS) per kilogram (kg).
The One:1 reaches 0 - 60 mph (97 km/h) in 2.7 seconds, 0 - 100 mph (161 km/h) in 4.55 seconds, 0 - 186 mph (300 km/h) in 11.92 seconds, 0 - 249 mph (400 km/h) in 20 seconds, and a theoretical top speed of 273 mph (440 km/h), whereas in the Motorsport games, it is downgraded to 266 mph (428 km/h) and in Forza Horizon 3, it is 269 mph (434 km/h).
The Koenigsegg One:1 currently stands as the fastest production car in the game in terms of overall performance, with very quick acceleration (0 - 100 mph (161 km/h) in less than 4.6 seconds) and an extreme top speed of 270 mph (435 km/h), making it among one of the fastest cars in the series in terms of stock top speed. To complement its very quick acceleration and extreme top speed, the One:1 also has decent cornering abilities and highly responsive braking, making it suited for medium-length and especially high-speed tracks. The sole disadvantage of the One:1 lies in its power – off the line, the One:1 has to deal with moderate to strong wheelspin even up to fourth gear (assuming Traction Control is disabled), making the car harder to control than most hypercars. This means that a driver behind the wheel of a One:1 has to be a lot more careful than normal when exiting corners, especially with regards to managing the throttle, effectively making this car more recommended for advanced drivers.
Even though the One:1 in real life is a targa top roadster like with Koenigsegg's models, in-game, the roof cannot be removed.
10-3Season Pass car packs, A10th Year Anniversary car pack, BPre-order bonus, FFast & Furious car pack, HHot Wheels car pack, NNASCAR expansion, PPorsche expansion, SETurn 10 Select car pack, SUTurn 10 Summer car pack, VVIP