BMW has prepared, in fiftieth anniversary of its M divisiona gift for sports fans and launched the M4 CSLa special limited edition which is also a sort of tribute to the winner of the 1973 European Touring Championship.
The starting point was M4 Competitionpumped some extra vitamins into the 3.0L straight-six engine, took a few steps to shed 100kg of weight, and ended up hitting the desired record in one lap of Nuerburgring: 7min15.677s (in the “classic” configuration of 20.6 km) and 7min20.207s (in the current configuration of 20.832 km which includes the straight line in the T13 section).
Which means that this M4 CSL (Competition, Sport, Light) that we show you here is the new owner of the best time achieved by a production BMW to date in the “green hell”.
“We love the smell of burnt rubber in the morning”
Other impressive records in this fight against time are the 3.7s from 0 to 100 km/h (0.2s less than the M4 Competition), the arrival at 200 km/h in just 10.7s or even the top speed of 307 km/h, which would be even higher if the electronics were not called upon to “gag” the dynamic frenzy that hides under the bonnet of the M4 CSL.
When BMW announces a new CSL, fans of the Bavarian brand begin to dream, because past achievements fully justify it. Many still remember the “Batmobile”, the BMW 3.0 CSL from 1973 or the radical M3 CSL (E46) from 2003 with 360 hp.
How to lose 100 kg
“Here we had to be very creative to be able to throw 100 kg for the CSL version”, guarantees Sebastian Maier, the project manager, not least because the car that served as the starting point – the M4 Competition – is not exactly a heavyweight. But in the end, the objective of the diet has been achieved with the 1625 kg (DIN) that this M4 CSL officially weighs.
We highlight the following measures: rear seats removed and replaced by compartments for storing helmets and there were 21 kg outside the edge; full carbon seats, 25 kg lighter; no carpets or nets, in addition to less soundproofing materials in the passenger compartment (with the added bonus of better hearing the delicious roar of the engine), 15 kg saved.
And then other measures such as the carbon fiber bonnet and trunk lid (on the M4 the roof was already made of this ultra-light and stiff material), standard carbon-ceramic disc brakes, rims special alloy, lighter springs and shock absorbers. , etc. And some equipment has been simplified, such as single-zone climate control (instead of two-zone on the M4), LED lights – including optional Laserlight – and panelless luggage compartment.
Engine with some extra “dust”
The straight-six engine saw turbo pressure increase by 0.4bar to 2.1bar and received new management, resulting in a 40bhp increase over the M4 Competition, to 550bhp, resulting in a sensational power-to-weight ratio. ratio of 2.95 kg/hp.
To ensure that the power can be transmitted to the tarmac once it has been transmitted via the eight-speed M-Steptronic automatic transmission, engineers at BMW’s M division lowered the ground clearance by 8mm , while increasing the camber of the front wheels. , installed larger diameter stabilizer bars, replaced all rubber mounts with ball bearings on the rear axle, reduced the spring rates and adjusted the Software electronic dampers.
In the certainty that CSL enthusiasts would understand that the inclusion of all-wheel drive would be heresy, traction is by the rear wheels only. The M Traction Control feature (standard) has track-specific settings, allowing the rider/driver to set intervention thresholds to limit wheel spin.
On dry asphalt, levels “1” to “5” of the M Traction Control help the driver to drifts controlled, while levels “6” to “10” are based on the app developed for touring cyclists and are suitable for wet and dry conditions (and varying tire temperatures) to maximize traction and directional stability . .
Production of the first units at the Dingolfing plant (Munich) starts in July, but any interested customer will not be able to put aside 165,200 euros (in Germany; with taxes in Portugal it should be around 200,000 euros …) the 1000 copies that will be manufactured. 250 are allocated to the United States, 150 to Germany… and so on, so there will be little left for the “peripheral” markets.
The yellow coloring of the daytime running lights only with the optional Laserlight.