Published On Aug 8, 2023
New BMW M4 CSL: Extreme performance with Motorsport DNA
Power boosted by 40 hp to 543, weight reduced by 240 pounds, unique chassis enhancements
Exclusive seating for two, with track-ready M Carbon full bucket seats
Fastest lap around the Nordschleife of any production BMW: 7:20.2
Global production limited to 1,000 units..
Powertrain. Modified six-cylinder inline engine, eight-speed M Steptronic transmission and rear-wheel drive for the ultimate performance experience.
Motorsport DNA, high-revving characteristics, and latest-generation M Twin Power Turbo technology make the inline 6-cylinder power unit from the BMW M4 Competition the perfect starting point for the high-performance engine in the most powerful road-legal M4 variant ever made. Detail modifications for the new BMW M4 CSL produce a maximum output of 543 hp at 6,250 rpm - an increase of 40 hp over the BMW M4 Competition. Peak torque of 479 lb-ft is on tap from just 2,750 rpm and sustained all the way up to 5,950 rpm. As a result, the unmistakable performance attributes of BMW M models – near instantaneous response to every movement of the accelerator, a voracious appetite for revs, and relentless power delivery well into the upper regions of the rev range – are present in even more heightened form. New and updated engine mounts and rigorous application of lightweight design principles ensure the new BMW M4 CSL achieves an even bigger gain in dynamic capability than this extra dose of power would suggest.
A design principle focused on extracting maximum power:
The design principle for the straight-six engine has been adapted from motorsport technology and is focused on high revs and maximum power delivery. The crankcase's sleeve-free, closed-deck construction helps to make it extremely rigid, thus allowing very high combustion pressures that optimize power output. The engine’s free-revving performance is aided by a twin-wire-arc-sprayed iron coating for the cylinder bores. The forged lightweight crankshaft enables the engine's high-revving ability, while its torsional resistance enables it to handle extremely high levels of torque. The M-specific components also include a cylinder head with 3Dprinted core. This additive manufacturing process enables geometric forms to be created that are beyond the capability of conventional metal casting techniques. As a result, the coolant duct routing could be optimized while also reducing its weight.
Two mono-scroll turbochargers supply compressed air to cylinders 1-3 and 4-6 respectively. The turbocharger's power output is further enhanced by the use of an indirect intercooler supplied by a lowtemperature circuit and specially designed compressors. Boost pressure has been increased from 24.7 psi in the M4 Competition to 30.5 psi in the CSL. Engine management has been modified accordingly to guarantee the constant power delivery up to the top end of the rev range that has come to be expected of BMW M.
Operating at a maximum pressure of over 5,000 psi, the High Precision Injection system ensures efficient mixture preparation and clean combustion. VALVETRONIC variable valve timing and Double-VANOS fully variable camshaft timing likewise form part of the M Twin Power Turbo technology.
Power channeled to the rear wheels via an eight-speed M Steptronic transmission with Drivelogic:
The torque produced by the S58 engine is sent to the rear wheels of the new BMW M4 CSL via an eight-speed M Steptronic transmission with Drivelogic. The M-specific version of this automatic transmission features ratios precisely attuned to the engine's characteristics and an extremely sharp shift action matched to the engine’s performance. This enables gear changes to be performed even faster than in the M4 Competition. Each gear change is clearly communicated to the driver, even when the transmission is operating in automatic mode. Manual shifts with sequential gear selection can be performed using either the selector lever or the carbon-fiber shift paddles on the steering wheel.
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