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The Koenigsegg CCXR is an "environmentally-friendly" mid-engined roadster from Swedish car manufacturer Koenigsegg. The CCXR is powered by a modified twin-supercharged V8 engine from its predecessor the CCX, converted to use E85 or E100 ethanol fuel as well as standard 98 octane petrol. Besides the use of ethanol fuel, the only changes to the engine are modified fuel injectors, upgraded fuel lines and piston rings and a higher boost setting on the superchargers. The increased power of the CCXR, compared to the CCX, is a result of the cooling properties of ethanol in the engine's combustion chambers allowing for a higher pressure in the cylinder and the biofuel having a higher octane rating of 113 RON compared to 95 RON for gasoline in North America and 100 RON for gasoline in Europe.

Koenigsegg says that it will go 259 mph, making it theoretically the fastest production car in the world. The designer of the CCXR, and owner of Koenigsegg, Christian von Koenigsegg is quoted as saying, "Our engineers couldn't quite believe the figures when we tested the car".

In March 2009 the CCXR was chosen by Forbes as one of the ten most beautiful cars in history.

Performance
The CCXR can accelerate from 0–100 km/h in 3.1 seconds and from 0–200 km/h in 8.9 seconds. The CCXR can accelerate from 0–200 km/h and decelerate from 200 (120mph)–0km/h in 13.7 seconds. According to Koenigsegg, the estimated top speed of the CCXR is 400+ km/h (250+ mph), although this has not been officially verified. The braking distance of the CCXR is 32m.(when decellerating from 100 km/h)

Engine
The Koenigsegg CCXR engine is a 4.7 liter 288 cuin V8, with dual overhead camshafts and 4 valves per cylinder. The engine block is made of Aluminium alloy that has undergone a T7 heat treatment, a form of accelerated precipitation strengthening. The engine is boosted by two Rotrex centrifugal superchargers that provide 1.6 bar of boost with an 8.8:1 compression ratio, which is achieved by sequential, multipoint feul injection. The engine has a patented response charge system for optimal engine response. The engine is lubricated with a dry sump system with a separate oil pump, the pistons are cooled by oil sprayed onto them and the oil itself has an external cooler.

The engine produces 1018 bhp at 7200 rpm and 782 lbft of torque at 6100 rpm on E100 ethanol fuel. The CCX engine burns 18 L/100 km on highway travel and 22 L/100 km on combined travel on E85 ethanol fuel.

Exterior
The CCXR is a two-door, two-seater with a removable hardtop that can be stored under the front hood lid allowing it to be changed at any location. The body, made of pre-impregnated carbon fiber and Kevlar with lightweight sandwich reinforcements, is 169 in long, 78.6 in wide and 44.1 in tall with a ground clearance of 3.94 in.

The CCXR has a frontal area of 1867 sqin and a drag coefficient of just 0.33. It also has a flat underside with venturi tunnels at the rear and an optional rear spoiler to improve aerodynamics. At 250 km/h there is 100kg of downforce.

Transmission
The CCXR has a specially developled transversal six speed manual gearbox with an optional paddle-shift with a dual plate clutch of diameter 240 mm.

The power is fed to the wheels through a torque sensitive, limited slip differential. The gear ratios of the CCXR can be seen in the table below.

Wheels and brakes
The standard CCXR wheels are Koenigsegg's carbon alloy wheels. The front wheels have a diameter of 19 in and thickness of 9.5 in, the rear wheels have a diameter of 20 in and thickness of 12.5 in. Each of the wheels is attached by center locking wheel nuts. The car comes with Michelin Pilot Sport 2 unidirectional tires with an asymmetric tread pattern. The front tires have codes of 255/35 Y19 and the rear 335/30 Y20.

The power-assisted front ventilated ceramic disc brakes are 380mm across with 34mm of contact at any point and have 8-piston light alloy Brembo calipers. The power-assisted rear ventilated ceramic disc brakes are 3362mm across with 32mm of contact at any point and have 6-piston light alloy AP Racing calipers.

CCXR Edition
The Koenigsegg CCXR Edition is a limited edition of the Koenigsegg CCXR manufactured in 2008. The Koenigsegg CCXR Edition is only available by special order in a very limited run of 6 production models.

It has a clear, fully visible unpainted carbon fiber body. The forged, machined and polished aluminium Edition wheels are extremely light and incorporate optimum brake cooling. The bright, polished surface of the wheels was chosen to maximize the contrast against the exclusive black clear carbon body. The CCXR Edition has a high performance specially developed rear wing, a larger front splitter plus side front strakes.

CCXR Trevita
The CCXR Trevita is a limited edition of the Koenigsegg CCXR Edition featuring a diamond weave carbon fiber finish. Trevita is an abbreviation in Swedish and translates into - three whites. Uptill the development of the CCXR Trevita, it has only been possible to utilize the classic black carbon fibers. The Koenigsegg Proprietary Diamond Weave, fully developed by Koenigsegg, is a new and unique method to manufacture the carbon fiber material for the CCXR Trevita. By utilising this new and unique method, Koenigsegg has managed to coat fibers with a diamond finish. The process was fully developed at Koenigsegg headquarters in Ängelholm Sweden, where the fiber treatment is conducted carefully in small quantities, prior to further processing the prepreg material.

Only three CCXR Trevitas will be produced, making it the rarest vehicle manufactured by Koenigsegg. All three cars will feature the Koenigsegg Shimmering Diamond Weave bodywork, double carbon rear wing, inconell exhaust system, carbon ceramic brakes with ABS, airbags, paddle-shift, chrono instrument cluster, infotainment system, tire monitoring system and a hydraulic lifting system.

Specifications Comparison Table
The following table compares the technical specifications of the CCXR, the CCXR Edition, and the CCXR Trevita. More accurate figures for the CCXR Trevita is expected to be released after the 2009 Frankfurt Motor Show.