All 2021 4 series models receive a boost in horsepower and torque over the models they replace. Powering the new 430i xDrive coupe is an updated 2.0-liter 4-cylinder BMW TwinPower turbocharged engine delivering 255 hp @ 5,000 – 6,500 rpm (an increase of 7 hp) and 294 ft-lbs. of torque @ 1,550 – 4,400 rpm (an increase of 36 ft-lbs.). The 430i xDrive coupe accelerates from 0 to 100 km/h in 5.6 seconds and reaches a top speed of 240 km/h (210 km/h when equipped with all-season tires).
Both 4-cylinder and 6-cylinder engines use a single, twin-scroll turbocharger, high precision fuel injection (operating at over 5,000 psi), VALVETRONIC fully variable valve timing and Double-VANOS variable camshaft timing. The 3.0-liter 6-cylinder in the M440i xDrive coupe also benefits from weight-optimized pistons and connecting rods and from an exhaust manifold integrated into the cylinder head allowing for better thermal efficiency from the integrated water cooling passages.
All 4 Series models deliver their power to the pavement through a standard 8-speed sport automatic transmission with launch control. The M440i xDrive coupe includes a standard rear M Sport differential which helps improve traction by equalizing drive torque between the left and right rear wheels under acceleration. It also works in conjunction with the DSC Stability control system to reduce unwanted understeer.
The latest version of BMW’s quick-shifting Sport automatic transmission features a new, optimized hydraulic control system for improved response and efficiency. A new generation of torsion dampers reduce rotational irregularities within the powertrain to help enhance driving comfort and shift smoothness.
Compared to the new 3 series sedan, the 2021 4 series coupe is 66 mm longer, 25 mm wider, 25 mm lower and with a 25 mm wider rear track while sharing the same wheelbase. Compared to the previous generation 4 series coupe, the 2021 4 series coupe is 132 mm longer, 25 mm wider, 10 mm taller and features a 40 mm longer wheelbase and 35 mm wider front and 30 mm wider rear tracks.
The standard M Sport Package includes a uniquely styled front bumper with larger air intake openings and a restyled rear bumper with Shadowline inlays. The rear diffuser panel, front air intake trim, side window moldings and lower exterior mirror housings are all finished in high-gloss black.
The M440i xDrive coupe’s exterior styling is set apart by a rear trunk spoiler and by a Cerium Grey finish to the kidney grille, front air intake trim, exterior mirror caps and rear trapezoidal exhaust tip trim.
The 2021 4 Series coupe interior features newly designed front power sport seats and leather sport steering wheel, which are standard. The upswept center console creates individual space for the front seat passengers. The M Sport Package and M440i xDrive coupe models offer additional soft knee padding on the sides of the center console as well as an M Sport steering wheel and door sill plates with the M logo.
A new 48-volt mild-hybrid system is standard on the 6-cylinder M440i xDrive coupe. The 48-volt starter/generator unit is complemented by a separate 48-volt battery which allows for energy recuperation, storage and use during driving. Energy can be recuperated from deceleration, braking and from excess electricity generated while driving in Sport mode.
The 48-volt starter generator also improves efficiency by allowing the stopped engine to be restarted quickly with little vibration. The Auto Start/Stop function can now turn off the engine while the driver is braking for a stop as soon as the speed drops below 15 km/h.