The BMW M factory produces a limited edition of a high performance sports car based on the BMW M3 Berlina. For its construction, it introduces an innovative material based on carbon fiber plastic that minimizes the weight, obtaining a weight/power ratio of 3.5 kilograms per horse.
In the Night M event, prior to the 24 h race of Nürburgring, BMW M GMBH revealed a new and spectacular model of its range. The BMW M3 CRT (Carbon Racing Technology, competition carbon technology) is a concentrated mixture of the best development skills - inspired directly in the competition - in the fields of the chassis propulsion and technology system and the intelligent light design. It also represents the world debut of a new process of production of carbon fiber plastic components (CFRP) in the automobile industry. This process allows CFRP to be widely used in the construction of this high performance sports car created by the BMW M GMBH factory, based on the BMW M3 Berlina. And this helps to achieve a weight/power ratio of 3.5 kg per horse. A V8 engine with exclusive features m of rapid turn and a maximum power of 331 kW/ 450 CV accelerates to the BMW M3 CRT from 0 to 100 km/ h in just 4.4 seconds.
The BMW M3 CRT will be produced in the BMW M GMBH factory in a limited series of 67 units. Following the footprints of the BMW M3 GTS - of which 135 copies were manufactured - this is the second small series, a derivative of the M3 with high performance conceived for the circuits but enrolled. The exclusive character of this Berlina is emphasized by light components made, manufactured with an innovative production process. The BMW M3 CRT hood and the Baquet type seats for the driver and the front passenger are made of carbon with a honeycomb structure, produced in a globally unique process, first used for the manufacture of body components of the BMW I3 and BMW I8 models.
Innovative manufacturing process for light CFRP components
these new models - which will enter production in 2013 and will be equipped with innovative electrical impulse technologies and BMW Activehybrid - will have a body made completely from CFRP in the area of the cabin's cage. With a new development, the production process initiated for this allows the cuts that remain in the construction of the body can be processed again. The basic material (made of carbon fiber thread) can now weave in fabrics of any size before being impregnated with synthetic resin and hardened similar to the material used in the BMW I3 and BMW I8 body. For the BMW M3 CRT this makes possible the manufacture of a hood made of two pieces of CFRP that cover a honeycomb structure made of Aramida. This construction causes the hood to have the same resistance as the conventional steel equivalent, but with approximately a quarter of its weight. The weight savings with respect to the aluminum hood of the standard m3 is around 50 percent.
The material produced with this innovative manufacturing technology is also used in the seats, of Baquet type. In this case, the CFRP layers wrap a recycled paper with a honeycomb structure, to which a carbon layer is added using conventional production technology for visible areas. The CFRP is also used to make both the rear wing of the BMW M3 CRT and an element to channel the air integrated into the frontal deflector.
This innovative manufacturing process offers considerable potential to increase the use of CFRP in cars produced in series as a way of lowering its weight. BMW Group is leading this field of car construction, while BMW M GMBH can use its enormous knowing how to make in competition applying intelligent light design. This tradition dates back to the BMW 3.0 CSL of the 70s and reached another peak with the BMW M3 CSL of 2002. BMW M GmbH also opened new paths with the use of CFRP in vehicles manufactured in series; As in the BMW M6 produced until 2010, the current BMW M3 Coupé has a manufactured roof made of carbon fiber reinforced plastic.
Significant weight reduction despite the generous serial equipment
The light construction of the BMW M3 CRT is improved with acoustic insulation configured especially for this new model, and a sports exhaust system with a titanium silencer, extremely light. The two individual rear seats are also unique to the CRT, which retake contours that improve lateral support.
The serial version of the BMW M3 CRT includes a double clutch transmission M with Driveogic, Professional Navigation System, BMW Audio System High End, a light, outer mirror and boot package, an alarm system and control of the parking distance with sensors both in the front and rear area. Despite this extremely generous selection of equipment, its empty DIN weight, 1,580 kg, reduces the BMW M3 Berlina as standard in about 45 kg. If the equipment included is taken into account, weight savings are around 70 kg. In addition to that, the intelligent reduction of the load in the front of the car has raised the weight proportion on the rear axle to 48.4 percent, which has had an extremely positive effect on agility.
V8 engine quickly with greater power; M DCT Driveogic
Under the CFRP hood of the BMW M3 CRT is a version of the V8 motor developed exclusively for the BMW M3 with the highest displacement, power and maximum motor torque. This high revolution propeller provides the delivery of linear power expected of an M car, and a performance profile with a great response perfected for circuit use. Adjusted for the BMW M3 GTS, this eight -cylinder engine develops 331 kW/450 hp from its cylinder of 4,360 cc. The maximum power is reached at 8,300 rpm, and the driver has a maximum torque of 440 Newton Metro at 3,750 rpm. One of the factors that help the engine to provide its intoxicating benefits is the fact that it is directly derived from the competition, with pieces such as the construction with crankshaft crankcase in a special aluminum and silicon alloy, individual accelerator butterflies, an engine of the engine detonation control system with ionic flow technology and an oil supply with dynamically optimized humid crankcase.
To transfer the force of the engine to the rear wheels there is a double clutch transmission M with drivelogic, developed for the BMW M3. This Seven -S -speed Driveogic unit also works according to a principle developed in the competition, which enables a power flow without interruptions between the marches, which provides an extremely dynamic acceleration. Its gear selection characteristics have been adjusted especially for the engine that drives the BMW M3 CRT. Change controls make it possible for the driver to change manually with optimal ergonomics. The Launch Control function is also available, which provides maximum acceleration in the output line.
Special construction of the chassis with technology born in the competition.
Knowing how to make accumulated in competition is also noticed in the BMW 3 CRT chassis technology. The construction of the front and rear axes of the BMW M3 Berlina has been improved with a rigid subchassis on the rear axle and telescopic columns with spring, whose shock absorbers can be adjusted individually in compression and extension. High performance brakes with fixed tweezers of six BMW M3 CRT pistons are made with low weight materials. The ventilated discs of the brakes measure 378 x 32 millimeters on the front axle, and 380 x 28 in the rear. This new M3 model also uses steel brakes and comfort brake pads, specific to this model.
The DSC system (dynamic stability control) specially adjusted - including the ABS and dynamic mode M (MDM) - responds to the greater dynamic potential of the BMW M3 CRT and is optimized for its weight distribution between the axes. On the other hand, the front tires 245/35 R 19 and rear 265/35 R 19 (mounted on 19 -inch light alloy wheels with radio design in “Y”) guarantee that the acceleration of the engine and the brake force are transmitted to the asphalt with the maximum effectiveness. Electronic BMW M3 CRT motor management limits its maximum speed to 290 km/h.
The exclusive Frozen Polar Silver exterior paint tone, in combination with the Melbourne Metallic Network details and the special treatment in the BMW grid, also move away the BMW M3 CRT from the standard M3. Inside, this Berlina has equally exclusive beautifiers in the doors, doors and moldings with grin aluminum structure. Completing the exclusive atmosphere that is breathed inside this high performance, is the M senior with sewer, which has an M Drive button so that the driver instantly selects his preferred settings, and a special bicolor upholstery Sakhir Orange and Black for the front seats and for individual rear seats.
