The McLaren 675LT (where "LT" stands for Long Tail) is a lightweight, track-focused evolution of the McLaren 650S. It was announced in February 2015 and introduced at the Geneva Motor Show 2015. It is currently the fastest car on the Top Gear test track with a time of 1.13.7 beating the Pagani Huayra by just .1 of a second.
As with the 650S, the 675LT makes use of single-piece carbon fiber monocell weighing 75 kg (165 lb), and carbon fiber use in the vehicle is increased in order to further minimize weight and increase rigidity. The 675LT is supplied with new carbon ceramic brake discs to increase braking performance over the 650S. Disc sizes are 394 mm at the front and 380 mm at the rear. Six-piston calipers grip the front discs with four-piston caliper used for the rears. Braking performance is also aided by the air brake ability of the new rear wing.
The 675LT makes use of a new 10-spoke wheel design, each weighing 800 g less than the alloy wheels on the McLaren P1, supplied in a 19-inch front and 20-inch rear fitment.
The 675LT utilizes a new rear wing/air brake assembly 50% larger than that used in the 650S, along with a new carbon fiber diffuser and an 80% larger front splitter with size-able end plates that together increase total down-force by 40%.
New carbon fiber pieces include both the front and rear bumpers as well as front under-tray, rear fenders, side intakes and deck-lid that contribute to the significant weight savings over the 650S. Alcantara is used throughout the interior where carpeting is removed and removal of the air conditioning unit and new carbon fiber race seats together save 26.5 kg (58 lb). 1 millimeter thinner window glass further reduces weight by 3 kg (7 lb). This extreme focus in weight saving results in a dry weight of 1,230 kg (2,712 lb), some 100 kg (220 lb) less than the 650S.
The car is powered by a variation of the M838T 3,799cc twin-turbo V8 petrol engine, producing 675 PS (496 kW; 666 hp) at 7100 rpm and 700 N⋅m (520 lbf⋅ft) at 5500 rpm. This is achieved through the addition of new lightweight connecting rods, bespoke camshaft, an electronic re-circulation valve and a lightweight titanium exhaust. Also used in the engine are revised turbocharger compressor wheels and an optimized fuel pump.
The 675LT uses the seven-speed automatic dual-clutch gearbox used in the 650S, with improved software reducing the shift time.
The 675LT can accelerate from 0–100 km/h (62 mph) in 2.9 seconds, 0.1 seconds faster than the 650S. 0–200 km/h (124 mph) in 7.9 seconds, 0–300 km/h (186 mph) in 25.9 seconds, 0–322 km/h (200 mph) in 31.2 seconds, and do the 0-402m sprint (1/4-mile) in 10.3 seconds at 227.1 km/h (141.1 mph), continuing on to a claimed top speed of 330 km/h (205 mph). On episode 2 of season 23 of Top Gear, the 675LT became the fastest production car on the Top Gear test track with a time of 1:13.7, beating the Pagani Huayra's time of 1:13.8. although the Ultima gtr 720 did an unofficial lap time of 1:09.9, beating the McLaren by nearly 4 seconds.
McLaren 675LT has a power to weight ratio of 0.49 horsepower per kg.
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