*See images of the BMW Concept M4 GTS in the clickable photo gallery below.
A year on from the launch of the BMW M4 Coupe, BMW has presented an initial preview of a high-performance model for use on the road and on the race track: the BMW Concept M4 GTS-the first M3/M4 special production vehicle to be sold in the U.S.
“While the BMW M4 Coupe embodies the ideal combination of motor sport genes and unrestricted everyday usability, the BMW Concept M4 GTS previews an emotionally powerful and exclusive special model conceived with an eye for trailblazing technology and a keen focus on the race track,” said Frank van Meel, chairman of the Board of Management for BMW. “Despite its outstanding track ability, it is still fully road-legal. This is racing technology for the road in the truest sense.”
The BMW Concept M4 GTS new technologies were showcased during the Pebble Beach Concours D’Elegance in Monterey, California on Aug. 13. The vehicle features the water injection system that already provided a significant output and torque boost in the BMW M4 MotoGP Safety Car, according to BMW. In addition, the BMW Concept M4 GTS has rear lights with OLED (organic light-emitting diode) technology for an unmistakable appearance.
The BMW Concept M4 GTS builds on the BMW M4 Coupe’s dynamic and emotional use of forms, according to BMW.
The manually adjustable front splitter and rear wing-both in exposed carbon-ensure aerodynamic balance on the race tracks and on the road, according to BMW. Another example of the engineers’ rigorous adherence to lightweight design is the CFRP (carbon-fiber-reinforced plastic) hood which lowers the car’s weight and center of gravity. A wide front air intake optimizes airflow and minimizes front axle lift.
The BMW Concept M4 GTS exterior paint shade is Frozen Dark Grey metallic, with the Acid Orange accent on the front splitter. The lightweight, forged and polished light-alloy wheels in 666 M styling also feature an Acid Orange accent. The 9.5 J x 19 (front) and 10.5 J x 20 (rear) wheels are fitted with Michelin Sport Cup 2 tires (265/35 R19 at the front, 285/30 R20 at the rear).
The water injection system introduced by BMW sees the engineers using the physical effect of water when vaporizing to draw the required energy from the ambient medium. The water is injected into the plenums of the intake manifold as a fine spray. When water vaporizes and goes through its phase transition absorbs heat, cooling the air intake significantly. As a result, the final compression temperature in the combustion chamber-and therefore the engine’s tendency to “knock”-is reduced, enabling the turbocharged engine to use higher boost pressure and earlier injection timing.
This technology ensures an increase in output and torque, while at the same time reducing the thermal stress on performance-relevant components, according to BMW.
To ensure optimal operating temperatures in all situations, BMW engineers developed a new cooling system. It comprises a main radiator plus additional radiators for the high- and low-temperature circuits, transmission and turbocharger in order to keep temperatures stable. The turbochargers are cooled by means of an indirect intercooler, assisted by an additional electric water pump.
OLED Rear Lights
The BMW Concept M4 GTS is fitted with rear lights featuring OLED (organic light-emitting diodes) technology, a new type of light source producing full-surface and homogenous illumination. The low installation height of just 1.4 millimeters and the ability to actuate individual light modules, which emit light to a single point, provide flexibility and allow for precision, according to BMW.