Rabu, 15 Januari 2014

NAIAS 2014 Highlights: 2015 BMW M3 & M4

The wait is finally over—and not a moment too soon. BMW ceased production of the E90 and E92 M3 coupe and sedan what seems like ages ago, and after teasing us with an M4 concept and a thorough crash course delivered via a rousing ride-along, we now have final specifications of the 2015 M3 sedan and M4 coupe. (Never mind that we’re still some six months away from the first models arriving on U.S. soil.) 

The new-generation M cars—which get their own chassis codes for the first time, F80 for the M3 and F82 for the M4—drop their predecessors' naturally aspirated 4.0-liter V-8 in favor of a quintessentially BMW straight-six. BMW has affixed the "TwinPower" moniker to the all-new, M-developed engine; the badging is applied to BMW’s gas and diesel turbocharged engines, and can refer to single, twin, or triple turbos, single or multiple dual-scroll turbos, or a turbo with variable inlet geometry. The M3 and M4 each are fitted with a pair of Mitsubishi-sourced turbochargers. 

The M3 and M4’s 3.0-liter unit, code-named S55, can rev to 7600 rpm—a remarkable achievement for a turbocharged mill. The twin-turbo six-cylinder is rated at 425 horsepower from 5500 to 7300 rpm, while torque tops out at 406 lb-ft from 1800 rpm. Those are increases of 11 horses and 111 lb-ft of twist versus the V-8–powered M3. The standard transmission is a six-speed manual, which automatically revs on downshifts. The optional transmission is a seven-speed dual-clutch automatic, which delivers quicker shifts in exchange for additional weight. 

BMW says that the 0-to-60-mph sprint takes 4.1 seconds with the six-speed manual, and the dual-clutch drops that number to 3.9. (For reference, the last M3 we tested came equipped with a stick and we managed a 0–60 time of 4.3 seconds.) Top speed is governed at 155 mph, but we believe that there will be an option to raise that limiter to 174 mph. Despite the impressive gains in output and claimed performance, the Bavarian automaker says that the M3 and the M4 will be 25 percent more efficient than the models they replace. 

Thanks to: Car and Driver

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