The 2016 McLaren 675LT Spider has a 100kg reduction, through the increased usage of carbon fiber and lighter components throughout, including newly developed suspension geometry derived from the McLaren P1. Furthermore, lightweight components are found throughout the powertrain and chassis, all contributing to a dry weight of just 1,270kg.
In looks, as with the 675LT Coupé, the 675LT Spider’s front bumper gets larger splitter and end plates, front under body, side skirts, side intakes, lower side intakes, rear bodyside lower, rear fenders, rear deck, rear bumper, diffuser and ‘Longtail’ Airbrake (all carbon fiber). Due to the inherent strength of the carbon fiber MonoCell chassis, no further strengthening, associated weight increase, has been added through the removal of the roof, and the 675LT Spider is only 40kg heavier than the Coupé, due to the retractable roof system.
The dramatic styling and purposeful stance of the 675LT is retained with the Spider variant, with the extended front splitter flanked by front wing end plates, each working the airflow harder and increasing downforce. Sculpted carbon fiber door sills run along the lower edge of the bodywork, flowing in to a smaller air intake ahead of the rear wheels. This sits below the more pronounced side intake, with both feeding clean, cool air into the side radiators which are more prominent to offer increased cooling. The retractable hard top stows below a colour-coded tonneau cover, and the engine remains visible through a lightweight vented polycarbonate engine cover. At the rear, the lightweight titanium crossover twin exhausts exit below the active ‘Longtail’ Airbrake which is 50 percent larger than other Super Series models.
As standard, the 675LT Spider is fitted with 10-spoke Ultra-Lightweight forged alloy wheels: 19-inch at the front and 20-inch at the rear with P Zero Trofeo R tyres. Two Super-Lightweight wheel options are optionally available; a new 20-spoke design, offered in liquid metal or diamond cut finishes, and the five-spoke Super-Lightweight design which debuted on the 675LT Coupé
The lightweight theme continues throughout the interior with Alcantara and bare carbon fiber used extensively. A pair of lightweight carbon fiber-shelled racing seats, modelled on those fitted to the McLaren P1, save a combined 15kg, and feature ‘675LT’ embossed leather to provide enhanced levels of support and grip. As seen in the McLaren P1 and 675LT, heating and ventilation controls are located within the portrait-orientated, centrally-mounted touchscreen, which also operates the four-speaker Meridian audio system, while air conditioning has been removed. The 16kg system can be specified as a no-cost-option.
Under the skin sits the heavily-revised 3.8-liter twin turbo V8 powertrain from the Coupé sibling, ensuring performance figures are worthy of the LT badge. The power output and torque figures remain unchanged, with 675PS (666bhp) delivered at 7,100rpm and 700Nm (516lb ft) available between 5,000-6,500rpm. The changes to the powertrain saw more than 50 percent of the components replaced to ensure optimized levels of power, torque and drivability. Acceleration from 0-100 km/h (0-62 mph) takes just 2.9 seconds, and 200 km/h (124 mph) is achieved in 8.1 seconds, giving away only 0.2 seconds to the more aerodynamically optimized and lighter Coupé. Top speed is 326 km/h (203 mph).
The 675LT Spider shares the suspension set up and geometry of the Coupé, with the front end sitting on stiffer springs and a wider track, increased by 20mm. Spring rates are the most track-focused of the Super Series models, with stiffness increased 27 percent at the front and 63 percent at the rear, providing a more rearward balance and allowing for a 40 percent increase in downforce over the 650S Spider.