The McLaren P1 is a hybrid hypercar
It's powered by a 3.8-litre twin-turbo V8 which produces 727bhp and 531lb ft
The McLaren's output can be boosted by an 'Instant Power Assistance System', which generates an additional 176bhp
XP2R indicates that this the second of McLaren's early P1 test cars, and that it has been revised
The P1's engine is heavily revised version of the M838T found in the MP4-12C
Myriad cooling systems are in place to control the temperature of the car's lubricants, coolants and intake air
The P1 is reputed to ride as well in town as it does on the race track
A 'Race' mode drops the car's ride height by 50mm and increases the spring rates by 300 per cent
A seven-speed dual-clutch transmission sends power to the rear wheels
Stopping power comes from carbon-ceramic discs
A sub-3.0sec 0-62mph time is claimed
The McLaren is limited to 218mph
Using its IPAS electric system, the McLaren can travel up to six miles on battery power alone
No economy figures have been announced, but the McLaren's claimed to emit "under 200g/km"
The P1's rear wing extends to a maximum of 300mm and pivots up to 29 degrees
Rivals to the P1 include the Ferrari LaFerrari and the Porsche 918 Spyder
This prototype has been undergoing trials at the Nurburgring
The McLaren costs around £866,000
McLaren has confirmed to Autocar that the McLaren P1 XP2R spied testing at the Nurburgring earlier this week is not a forthcoming special edition of the P1.
The prototype version of the hybrid hypercar was spotted by spy photographers at the German circuit earlier this week. The car features discreet 'XP2R' badging, prompting speculation in some quarters that McLaren is already fettling a higher-performance variant of its new machine.
However, when contacted by Autocar for verification, a McLaren spokesman explained that XP2R is a test mule of the standard P1.
McLaren uses three types of code on its development vehicles: XP denotes early test cars, VP for later ones and PP for nearly finalised models. Respectively, the tags indicate 'eXperimental', 'Validation' and 'Pre-production'. The '2' indicates that the car is the second test car, while the 'R' discloses that it is a revised prototype.
McLaren's P1, which costs around £866,000, uses a twin-turbo 3.8-litre V8 and KERS to produce a total of 903bhp and 664lb ft. Official performance figures have yet to be released, but it's thought that the P1 will be capable of 0-62mph in under 3.0sec and reach a top speed of 218mph.