With its next-level power and intelligent lightweight design, two-seater configuration, model-specific chassis upgrades and equipment features selected specially for the job at hand, the new BMW M4 CSL has track driving as its raison d'être. The genes the M4 CSL shares with its competition-spec sibling, the BMW M4 GT3, are also reflected in its performance attributes. In test runs on the Nürburgring's Nordschleife circuit, the BMW M4 CSL posted the fastest lap times ever for a series-produced BMW car. On the version of the track traditionally used for comparison purposes - which is 20.600 kilometres / 12.8 miles in length and doesn't include the straight at section T13 - it stopped the clock at 7 min. 15.677 sec. Its official and notarised lap time for the 20.832-kilometres / 12.943-mile circuit (the complete lap) was 7 min. 20.207 sec. Acceleration figures of 3.7 seconds from 0 to 100 km/h (62 mph) and 10.7 seconds for the sprint from 0 to 200 km/h (124 mph) are similarly impressive.
Six-cylinder in-line engine with race-focused character
The model-specific power unit of the BMW M4 CSL is based on the same high-revving, six-cylinder in-line engine with M TwinPower Turbo technology found in the BMW M4 GT3 racing car. Its substantial performance reserves enabled a major hike in power without having to make any concessions in terms of stability or durability. Key to this power boost was an increase in the maximum charge pressure of the two mono-scroll turbochargers from 1.7 bar to 2.1 bar and model-specific tweaks to the engine management. The BMW M4 CSL's engine develops peak torque of 650 Nm (479 lb-ft) between 2,750 and 5,950 rpm. Its maximum output of 405 kW/550 hp is produced at 6,250 rpm. The race-derived design of the 3.0-litre engine is focused squarely on high revs and maximum power development. The crankcase's sleeve-free, closed-deck construction helps to make it extremely rigid, while the forged lightweight crankshaft allows it to handle extremely high levels of torque. Another special M-specific feature is the cylinder head core made using 3D printing techniques. Both the cooling and oil supply systems are designed to handle the particular challenges presented by track driving. The twin-tailpipe exhaust system with electrically controlled flaps and weight-minimised titanium rear silencer additionally generates a racing-car-inspired, emotionally engaging engine note created especially for the new BMW M4 CSL.
Optimised body rigidity, model-specific chassis technology
Like the engine in the new BMW M4 CSL, its chassis technology benefits from a wealth of detail upgrades - which have been tailored to the power unit's performance characteristics. These modifications also factor in the substantial reduction in vehicle weight at play here and the model-specific improvements to body rigidity, allowing the blend of handling agility, dynamism and precision for which BMW M cars are renowned to be taken to new heights. In the engine compartment, a composition of front-end strut braces developed entirely from scratch raises the body rigidity of the new BMW M4 CSL up another level. Using numerical models, the geometry of the cast aluminium elements between the spring strut towers and the front end has been adapted precisely to the forces exerted in different driving situations.
M Traction Control optimised for the track
The standard-fitted M Traction Control function with model-specific track tuning lets the driver set individual intervention thresholds for wheel slip limitation. On dry surfaces, stages 1 to 5 of M Traction Control help the driver to execute controlled drifts. Stages 6 to 10 are based on the application developed for touring car racers and make allowance for both surface conditions and tyre temperature to maximise traction and directional stability. Also specified as standard are forged M light-alloy wheels in an exclusive cross-spoke design (19 inches at the front axle and 20 inches at the rear). These are fitted with high-performance tyres specially developed for the special-edition model in size 275/35 ZR19 (front) and 285/30 ZR20 (rear).
Equipment designed to provide a race-car feeling and everyday usability
Model-specific equipment features give the BMW M4 CSL a distinctive balance between sports car purism, unrestricted everyday usability and exclusive premium substance. The M Carbon full bucket seats for the driver and co-driver are marked out by their self-supporting CFRP structure and purposeful rejection of comfort-enhancing features. They have a fixed backrest angle, forward/back adjustments can be made manually, and the seat height can only be adjusted in a workshop using a three-stage screw linkage. The M Carbon full bucket seats also have detachable head restraints and allow the integration of a six-point belt system. The M Alcantara steering wheel, anthracite-coloured headliner, Carbon Fibre interior trim strips, "CSL" badges on the seats, centre console and rear panel, plus M-specific displays also help to create the perfect on-board setting for concentrated driving pleasure. Merino leather trim with extended features and M seat belts are also standard. Two helmet storage units can be found in the rear compartment.
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