The engineers at BMW M GmbH tend to pre-empt such desire and have indeed done so by presenting a more track-focused version of the M4 in concept guise. Much like the previous car, this M4 will wear the GTS badge.
Previous ‘hot’ versions of already heavily worked M cars include the BMW M3 Evolution (1988), BMW M3 Sport Evolution (1990), BMW M3 GT (1995), BMW M3 CSL (2003), BMW M3 GTS (2010) and BMW M3 CRT (2011).
It gets a number of goodies such as a manually adjustable carbon front splitter and rear wing as well as a CFRP (carbon-fibre-reinforced plastic) bonnet, while a wider front air intake optimizes airflow and minimizes front axle lift. The concept is painted in frozen dark grey metallic with orange accents on the front splitter. There are also new 20-inch forged alloy wheels with Michelin Sport Cup 2 tyres.
The car will also have increased power and torque; aiding this is a water injection system. The system works as follows: Water is injected into the plenums of the intake manifold as a fine spray. When water vaporizes and goes through its phase transition, it 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 motor to use higher boost pressure and earlier injection timing.
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