McLaren 675LT

مک لارن 675 ال تی

ID:25263 Section: Auto-2015

Updated: Monday 20th April 2015

مک لارن 675 ال تی تعریف

(Wikipedia) - McLaren 650S   (Redirected from McLaren 675LT) McLaren 650S Overview Manufacturer Production Assembly Designer Body and chassis Class Body style Layout Related Powertrain Engine Transmission Chronology Predecessor
McLaren Automotive
2014–present
Woking, Surrey, England
Frank Stephenson
Supercar
2-door coupé 2-door roadster
Rear mid-engine, rear-wheel-drive
McLaren 12C McLaren P1
McLaren M838T twin-turbo 3.8 L V8
7-speed dual-clutch
McLaren 12C

The McLaren 650S is a supercar designed and manufactured by McLaren Automotive. It was announced in February 2014 as a new model, but based on the existing McLaren MP4-12C with 25% new parts, and was formally unveiled at the 2014 Geneva Motor Show.

The 650S shares the MP4-12C''s Carbon-fiber-reinforced polymer chassis, and is powered by the same McLaren M838T 3.8-litre V8, twin-turbo engine, but now developing 641 bhp (478 kW; 650 PS) and 500 lb·ft (680 N·m) of torque. Power is transmitted to the wheels through a seven-speed near instantaneous shift dual-clutch gearbox.

The 650S has a claimed top speed of 333 km/h (207 mph), and can accelerate from 0–100 km/h (0–62 mph) in 3 seconds and from 0–200 km/h (0–124 mph) in 8.4 seconds.

Contents
  • 1 Variants
    • 1.1 650S Spider (2014–)
    • 1.2 625C (2015–)
    • 1.3 675LT (2015–)
      • 1.3.1 Chassis
      • 1.3.2 Body and cabin
      • 1.3.3 Drivetrain
      • 1.3.4 Performance
      • 1.3.5 Nomenclature
  • 2 Motorsports
    • 2.1 GT3
  • 3 References
  • 4 External links
Variants 650S Spider (2014–)Rear view of 650S Spider

First announced in March 2013, the 650s Spider is a convertible version of the 650S. It weights 40 kilograms (88 lb) more than the coupe, but it offers nearly identical performance. It can accelerate from zero to 60 mph in 3 seconds and has a top speed of 204 mph. Up to 25 percent of the parts are new compared to the McLaren 12C Spider.

625C (2015–)

In September 2014, McLaren launched an additional model to the range, the McLaren 625C, available in both coupé and roadster versions initially aimed at specific markets in the South Asia Pacific region.

Powered by the same 3.8-litre twin-turbocharged V8 engine, but with a reduced power output of 616 bhp (459 kW; 625 PS). The 625C is fitted with new dampers and a revised suspension setup, including softer spring rates. Braking is by cast-iron discs instead of the carbonfibre-ceramic units fitted to the 650S. Top speed remains the same as the 650S but acceleration 0–100 km/h (0–62 mph) is slightly slower at 3.1 seconds.

675LT (2015–) McLaren 675LT Overview Manufacturer Production Designer Body and chassis Body style Layout Powertrain Engine Transmission
McLaren Automotive
2015–present
Frank Stephenson
2-door coupé
Rear mid-engine, rear-wheel-drive
McLaren M838T twin-turbo 3.8 L V8
7-speed dual-clutch

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.

Chassis

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 394mm at the front, s and 380mm discs 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 800g 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.

Body and cabin

The 675LT utilizes 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), some 100 kg (220 lb) less than the 650S.

Drivetrain Main article: McLaren M838T engine

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 516 lb·ft (700 N·m) at 5500 rpm. This is achieved through the addition of new lightweight connecting rods, bespoke camshaft, a 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 seven-speed automatic dual-clutch gearbox used in the 650S, with improved software reducing the shift time.

Performance

The 675LT can accelerate from 0–100 km/h (62 mph) in 2.9 seconds and 0–200 km/h (120 mph) in 7.9 seconds, continuing to a claimed top speed of 330 km/h (210 mph).

Nomenclature

The ''675'' in the 675LT model name refers to the power output of 675 PS, 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.

Motorsports GT3

In June 2014, McLaren announced that they would produce a GT3 version of the 650S, either as a new car or as an upgrade for the existing 12C GT3 – which will contest GT3 championships from 2015 onwards.

Changes to the car include a new seven-speed sequential motorsport gearbox; 380mm ventilated brake discs with six-piston calipers at the front and four-piston units at the rear; a 52mm wider track; revised suspension geometry and upgraded components. It is distinguished from the road car by larger air intakes and front splitter, and carbon-fibre air intakes and a new rear wing.

The 3.8-litre McLaren V8 twin-turbo engine, also used in the 12C-GT3, produces 493 bhp (368 kW; 500 PS), and includes a new ECU to improve turbo boost and gearshifts. The power output is lower than the road going 650S’s due to Homologation.

Andrew Kirkaldy, whose CRS Racing team developed the GT3 version of the McLaren MP4-12C, said that they were aiming to develop a version that conforms to the LM GTE regulations at the 2016 24 Hours of Le Mans.

Tags:2015, 24 Hours, Asia, Asia Pacific, Automotive, England, Geneva, McLaren, McLaren 650S, McLaren 675LT, Pacific, South Asia, Wikipedia

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