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The letter combination CSL (which stands for “Competition, Sport, Lightweight”) refers to the importance of optimized weights for success in motorsports. The BMW 3.0 CSL, developed by BMW Motorsport GmbH on the same principle, won the European Touring Car Championship in its debut year 1973. The new CSL M4 not only follows the ‘tyre footprint’ of this CSL 3.0, but also special editions of previous M3/M4 models. , with major representatives such as the M3 CSL from 2003 and the M4 GTS introduced in 2016.
For BMW M GmbH, the inauguration of the BMW M4 CSL at the Concorso d’Eleganza Villa d’Este (20 – 22 May 2022) is an important moment in celebration of its 50th anniversary. The M4 CSL will be produced in a limited 1000 series from July at the BMW Group Dingolfing production facility.
The talent for innovation and extensive racing car expertise allowed BMW M GmbH to reduce the weight of the M4 CSL (average fuel consumption 9.8 – 10.1 l/100 km, average CO2 emissions 222 – 227 g/km according to WLTP ). ) to 1,625 kg (according to DIN). The resulting excellent power-to-weight ratio of 2.95 kg per hp is the starting point for an incredibly dynamic driving experience.
The M Carbon full bucket seat installation reduces weight by approximately 24 kg compared to the sport seats fitted as standard on the M4 Competition Coupé (average fuel consumption 9.8 l/100 km, average CO2 emissions 223 – 224 g/km according to to WLTP). installed. Removing the rear seat and rear seat belt saves 21 kg. The modified chassis also saves 21 kg, including extra light M Carbon ceramic brakes, as well as special M light alloy wheels, springs and reinforcement. Using fewer and lighter sound insulation materials results in a lighter weight of 15 kg, using 11 kg of carbon fiber reinforced plastic (CFRP). In addition to the roof, the hood, tailgate and center console of the M4 CSL are made of high-tech lightweight CFRP. The titanium exhaust scrapes an additional 4 kg of exhaust system weight. And detailed adjustments to the BMW kidney grille, taillights, floor mats and automatic air conditioning make the M4 CSL 4 kg lighter.
The M4 CSL body is optionally available in the exclusive Frozen Brooklyn Gray metallic color. This body color complements the exposed carbon surface and red accents. Alternatively, you can choose from the exterior colors Alpinweiß uni or Saphirschwarz metallic.
The carbon fiber structure on various parts of the body is visible in a number of places, such as the two notches on the hood. The surface of this notch, which is not body color, is accentuated by a red border. The red accent line draws attention to the two fins on the CFRP roof, the contours of the side sill panels, the black type designation and the model-specific CFRP splitter and Air Curtain inserts on the nM4 CSL’s front bumper.
Optional Laserlight headlamps create an eye-catching accent on the front. Both when unlocking the car, as part of the Welcome Light lighting function, and when the low or high beam lights are turned on, these headlights emit amber-and-white light. They are reminiscent of GT racing car lighting.
LED taillights are standard with the technology that debuted in the series production model: a very fine thread of light is woven into the glass enclosure, which is illuminated with laser technology. As a result, the taillight surface has a very distinctive luminous structure and light signature, which can be recognized from a great distance.
The power unit developed specifically for the M4 CSL is based on the high-speed inline six-cylinder engine with M TwinPower Turbo technology from the racing version of the M4 GT3. Its power reserve allows for a significant increase in power without compromising turning characteristics and life. The main contributors to this power increase are the increase in the maximum charge pressure of the two MonoScroll turbochargers (from 1.7 to 2.1 bar) and improvements to engine management. The M4 CSL engine produces a maximum torque of 650 Nm between 2,750 and 5,950 rpm. Maximum power of 405 kW (550 hp) is ready at 6,250 rpm.
The motorsport-inspired 3.0-liter six-cylinder engine design focuses on high revs and maximum power development. The closed-deck construction of the crankcase makes it extremely strong, while the lightweight forged crankshaft makes it suitable for very high torques. Another M special feature is the cylinder head, which is manufactured using 3D printing technology.
Both oil lubrication and cooling are designed for the challenges of track use. A dual exhaust system with electronically controlled valves and lightweight titanium mufflers deliver immersive motorsport-inspired sound specially tuned for the M4 CSL.
Engine drive torque is transferred to the rear wheels via an 8-speed M Steptronic Sport transmission with Drivelogic. The model-specific engine and transmission mounts claim that engine power is quickly and instantly converted into dynamic driving performance.
Like the CSL 4 engine, the chassis technology also benefits from many detail changes, which are tailored to the performance potential of the power unit. This modification also plays an important role in reducing weight and making the body stiffer.
In the engine compartment, an entirely newly developed combination of reinforcing elements ensures the M4 CSL’s extremely high body rigidity. Based on numerical models, the geometry of the die-cast aluminum elements between the struts and the front of the car is very precisely matched to the applied style in the most diverse driving situations.
Individually tuned axle kinematics and model-specific camber settings, springs, dampers and stabilizers optimize steering precision, control of lateral forces during cornering, suspension and damping response and wheel guidance. Compared to the M4 Competition Coupé, the wheel suspension has been adjusted and the chassis has been lowered by 8 millimeters. Standard equipment for the M4 CSL includes Adaptive M Suspension with electronically controlled dampers, electromechanical Servotronic M control with variable transmission and M Carbon ceramic brakes.
The standard M Traction Control function, adapted for track use, offers the driver a choice of different levels of intervention for traction control. On dry surfaces, stages 1 through 5 of Traction Control M allow controlled drift. Stages 6 through 10 are based on an application developed for touring car drivers. It takes into account road conditions and tire temperature to maximize traction and stability. Also standard are lightweight M wheels forged in an exclusive cross-spoke style (19-inch front and 20-inch rear). It is equipped with tires developed specifically for the M4 CSL in sizes 275/35 ZR 19 (front) and 285/30 ZR 20 (rear).
The M-specific control system includes an M Settings button for direct access to various vehicle settings and two M switches on the steering wheel for saving individual configurations and quickly recalling them while driving. Also standard equipment is the M Drive Professional system including the M Drift Analyzer, M Laptimer and M Mode button to activate ROAD, SPORT and TRACK settings.