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2015 BMW M3, and M4 trade engine cylinders for turbos

The 2015 BMW M3, left, and the M4,

The 2015 BMW M3, left, and the M4, right, are expected to hit dealerships in the summer of 2014. Credit:

Competes with: Mercedes-Benz C63 AMG, Audi RS 5 and several cars in the rumor mill

Looks like: The 3 and 4 Series with some aggressive additional bodywork

Drivetrain: Turbocharged 3.0-liter inline six with 425 hp and a seven-speed dual clutch automatic or six-speed manual transmission; rear-wheel drive

Hits dealerships: Summer 2014

Witness the new M3 sedan and its M4 coupe sibling, which lop off two cylinders but add a whole heap of turbocharging. It had to happen, didn't it? Automakers — particularly the Germans — are swapping cylinders for turbos like displacement is the plague. The latest iterations of the Audi S8 and BMW M5 have dropped V-10s for turbo V-8s; even Mercedes-Benz downsized most of its AMG V-8s and added turbos.

And so it goes with the M3 and M4, which drop the outgoing M3's 4.0-liter V-8 for a turbocharged 3.0-liter inline-six. (The M4 replaces the prior-gen M3 coupe, much as the 4 Series replaces the prior 3 Series coupe.) Overall power climbs, however, with the turbo six making 425 horsepower versus the last M3's 414 hp. The M3 takes on Mercedes-Benz's C63 AMG and, if Lexus' latest teaser is any indication, an IS-F version of the new IS 250/350. Cadillac's rumored ATS-V is another competitor. The M4, meanwhile, takes on the likes of Mercedes' C63 AMG coupe, Audi's RS 5 and perhaps Jaguar's forthcoming F-Type coupe.

We'll see the M3 in person at the 2014 North American International Auto Show next month in Detroit; it goes on sale in summer 2014. There's no word on an M version of the new 4 Series convertible, but given the existence of prior M3 convertibles, one is likely in the works.


Whereas any sports-car maker claims development time at Germany's Nürburgring circuit, BMW says it put in "thousands of laps" on the famed track. (Take that, auto industry!) BMW says the M3 and M4 use extensive carbon fiber-reinforced plastic, which we've seen on the automaker's new i8 sports car. Both the M3 and M4 have carbon-fiber roofs.

Both cars also have reworked bumpers with larger air intakes and frontal air curtains to redirect airflow. The M3 gets a slight trunk lid spoiler, while the M4's deck lid juts up enough to do the job without a dedicated spoiler. Like in past M cars, the side mirrors have twin supports, though the upper one is fake. LED headlights are optional.


The cars' cabins mirror the 4 Series and 3 Series interiors with the addition of M-specific cues like badging, a sportier steering wheel, sport seats, plenty of carbon fiber trim and a unique instrument cluster.

For the controls, a 6.5-inch tabletlike screen is mounted on dashboard; it shows stereo and vehicle information. BMW says the cars use a new generation of the brand’s navigation system with "extra capability," clearer graphics and 3-D map elements.

Under the Hood

Overall power comes to 425 hp from 5,500 to 7,300 rpm and 406 pounds-feet of torque at just 1,850 rpm. That's up from the last M3's 414 hp at a sky-high 8,300 rpm and 295 pounds-feet of torque at 3,900 rpm. BMW says weight drops some 175 pounds versus the M3 coupe, whose 3,704-pound curb weight already outdid its class – 112 and 308 pounds lighter, respectively, than the 2014 Mercedes-Benz C63 AMG and Audi RS 5 coupes. Both competitors employ normally aspirated V-8s, however, and future versions could drop a couple cylinders and their attendant ballast. BMW has a considerable lead, but only for now.

Add it all up, and BMW says the M3 and M4 sprint to 60 mph in 3.9 seconds with a twin-clutch, seven-speed automatic or 4.1 seconds with a six-speed manual, which can now match revs like in the M5. That's expletive-inducing quickness, and it means the new M3 and M4 should leap past its predecessor (4.5 to 4.7 seconds for the 2012 M3 coupe, depending on transmission). It should also outrun the C63 AMG (4.4 seconds) and Audi RS 5 (4.5 seconds). (All times are from each car's respective automaker.)

Thanks to the displacement decrease, the M3 and M4 reduce fuel consumption by 25 percent versus the (pretty inefficient) M3, BMW says.

Safety Features

A head-up display is optional, as is a front-collision warning system and Active Driving Assistant, which warns the driver of an impending collision with a pedestrian. 

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