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McLaren 675LT chassis #001

2,225 views · Published 18 October 2015 · 1:29 · Indexed 23 September 2026

Channel: Mashley Media · 2015 · People & Blogs

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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 2015 Geneva Motor Show. 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 fibre monocell weighing 75 kg (165 lb), and carbon fibre use in the vehicle is increased in order to further minimise 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 new wheels are shod in Pirelli P-Zero Trofeo R track-focused, street-legal tyres which increase grip by up to 6% over the P-Zero Corsa sold with the 650S.

The 675LT utilises a new rear wing/air brake assembly 50% larger than that used in the 650S, along with a new carbon fibre diffuser and an 80% larger front splitter with sizeable endplates that together increase total downforce by 40%.

New carbon fibre pieces include both the front and rear bumpers as well as front undertray, rear fenders, side intakes and decklid 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 fibre race seats together save 26.5 kg (58 lb). 1 millimetre 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), 100 kg (220 lb) less than the 650S.

The car is powered by a variation of the M838T 3.8 L; 231.8 cu in (3,799 cc) twin-turbo V8 petrol engine, producing 675 PS (496 kW; 666 hp) at 7100 rpm and 700 N⋅m (516 lbf⋅ft) at 5500 rpm. This is achieved through the addition of new lightweight connecting rods, bespoke camshaft, an electronic recirculation valve and a lightweight titanium exhaust. Also used in the engine are revised turbocharger compressor wheels and an optimised fuel pump.

The 675LT uses the 7-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 1⁄4 mile (402 m) sprint 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.

The McLaren 675LT has a power to weight ratio of 1.97 kg (4.34 lb) per horsepower.

The '675' in the 675LT model name refers to the power output of 675 PS (496 kW; 666 bhp), following the naming scheme started by the McLaren 650S. The LT in the model name is a reference to the "Long Tail" 1997 McLaren F1 GT which was the final incarnation of the F1 road car built to comply with FIA homologation regulations for the 1997 F1 GTR. The F1 GT featured extended front and rear overhangs that produced similar downforce to the previous homologation special, the F1 LM, without the use of a drag-inducing fixed rear wing.

A convertible variant of the 675LT was revealed online in December 2015. It shares the same 675 PS (496 kW; 666 bhp), 3.8-litre twin-turbocharged V8 engine as the coupé, but has a folding hardtop roof as seen on the 650S Spider. The 675LT Spider can accelerate from 0–100 km/h (0-62 mph) in 2.9 seconds and 0–200 km/h (0-124 mph) in 8.1 seconds. The top speed is reduced slightly, to 327 km/h (203 mph).

The McLaren MSO HS is a limited version of the outgoing 650S model and is based on the 675LT variant, inspired by the McLaren P1 GTR. It was revealed online in late 2015. The car is lighter and more powerful than the 675LT, the upgraded engine now produces 688 PS (679 hp) and 516 lb⋅ft (700 N⋅m) of torque at 7000 rpm. The car is approximately 19 kg (42 lb) lighter than the 675LT thanks to the use of an Alcantara interior and carbon fibre racing seats with racing harnesses similar to those found in the P1 GTR, although, Nappa leather interior is optional. Exterior changes include a new bumper with front splitters, roof mounted air scoop, full length side skirts and an adjustable fixed rear wing, inspired by the P1 GTR.

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