Wild McLaren Senna GTR launched

Millionaire track day addicts will soon have the choice of a new limited-edition McLaren Senna GTR following the British supercar-maker unveiled the production car over the weekend.

Priced from £1.1 million ($A2m), the track-only hypercar was initially previewed last year at the 2018 Geneva motor show but, until now, the finished McLaren Senna GTR had remained under wraps.

Limited to a production run of just 75 cars, like the road-legal hypercar, the McLaren Senna GTR comes powered by the same 4.0-litre twin-turbocharged V8 that produces 607kW and 800Nm of torque -- that's 19kW more than the standard Senna, while producing the same amount of torque.

Featuring an even wilder aero than the road version, engineers have introduced significant bodywork changes over the regular car, the Senna GTR has a wider front and rear track, a larger front spoiler and a large front splitter that screams 'motorsport'.

There's also front dive planes and cool sill-mounted vortex generators.

At the rear of the car there's a completely redesigned diffuser and a repositioned active rear wing.

Following many more hours in the wind tunnel, the changes are significant. Now the Senna GTR generates 1000kg of downforce at 250km/h -- 200kg more than the road car while under braking the car can pull 3g in deceleration -- 20 per cent more than the car it's based.

Thanks to the extra power, and a weight saving of around 10kg, the Senna GTR is said to be capable of out-accelerating the road car but McLaren has yet to release full figures, but expect the odd tenth to be shaved off the 0-100km/h time of 2.8 seconds and the incredible 6.8 seconds it takes the normal Senna to launch itself to 200km/h.

That weight-saving comes from the removal of the airbags, handbrake, exhaust silencer and the use of plexiglass in place of side glass.

The quickest-ever McLaren has also been adapted to run on slick Pirelli tyres, although 'wet' tyres have also been developed for the car.

Helping exploit the full performance of the Senna GTR, engineers have developed three powertrain modes, Track, Race and Wet that tailors the electronics to deploy as much power and torque as possible.

There's also adjustable ABS brakes, a pit-lanes speed limiter, tyre pressure monitors, brake pad wear monitors, brake disc wipe and, even, anti-collision radar.

That rear wing, meanwhile, also has an airbrake function that improves the Senna GTR's stopping performance by 20 per cent of the standard car.

Keeping the drive safe, inside there's an integrated roll cage, and a set of full harness mounts for the race seats.

Around a lap, McLaren says the Senna GTR is capable of humbling the P1 GTR and only its F1 cars can clock a quicker time.

Only made in left-hand drive, McLaren has confirmed deliveries of the 75 $2 million Senna GTR will commence in September with all 75 said to have been sold.

Each are thought to have bee personalised with special McLaren Special Operations (MSO) accessories, including customer paint and race liveries.