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Country of origin:Germany
Introduced in:2021
Source:Company press release
Last updated:September 23, 2020
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Click here to download printer friendly versionBoth new M3 and M4 models benefit from body and chassis enhancements over their non-M relatives and from countless hours of intensive testing at BMW Group’s Miramas testing facility in the South of France, at the winter testing center in Arjeplog, Sweden, and from Nurburgring’s Nordschleife.

The standard Adaptive M suspension with electronically controlled shock absorbers offers precise control with comfort and agility. The M integrated braking system offers two driver-selected settings for brake pedal feel. The M Traction Control system, part of the optional M Drive Professional, introduces a new integrated wheel slip limitation function of the Dynamic Stability Control system which can be adjusted through 10 stages based on the driver’s preferences and needs.

An extensive package of bracing enhances vehicle rigidity and agility. At the front of the new M3 and M4, bracing connects the two shock towers together, the shock towers with the bulkhead and with the front end of the vehicle. Vertical bracing connects the engine compartment to the front M aluminum subframe which is also tied to the sills via integrated bracing. The center and rear chassis areas also see added stiffening using crossbar bracing and bracing connecting the rear subframe with the rear cargo area.

The M-specific double-joint spring strut front suspension includes newly developed aluminum wishbones with ball joints, an aluminium torque arm with new mounts, a forged swivel bearing with a unique spring strut clamp and lightweight wheel bearings with very a high camber range. Large castor and kingpin angles as well as a lowered roll center enable the combination of agility and comfort for everyday driving and long journeys. The five-link rear suspension features hubs and wishbone control arms which have been newly developed to ensure precise handling for the most demanding driver.

The front track has been increased by 1.5-inches over the previous models which helps to improve traction and directional stability of the new M3 and M4.

The standard M Servotronic steering combines speed-sensitive assistance with a variable steering ratio allowing this M-tuned system to deliver precise handling and easer maneuvering at low speeds.  The variable ratio adjusts to changes in steering angle and helps deliver superb straight-line composure and sharp turn-in response with excellent directional accuracy.  When the wheels are already sharply turned, the steering rack teeth are positioned more closely together, so smaller steering wheel inputs are required. As a result, the car feels nimble on winding roads and can be maneuvered into and out of parking spaces with far less steering effort. The M Setup menu gives access to two steering settings – COMFORT for an easy steering feel with precise feedback and SPORT which increases both the feedback and the amount of steering effort required.

The electronically controlled shock absorbers of the standard Adaptive M suspension utilize electromagnetically controlled valves which react in milliseconds to generate an infinitely variable damping force for each individual wheel.

The damper characteristics can be adjusted via the M Setup menu. The driver can select from three modes - COMFORT which focuses on everyday driving journeys and long trips by smoothing out road imperfections. SPORT which has been tuned for fast road conditions such as the Nürburgring Nordschleife. And SPORT PLUS which optimizes damper control for maximum dampening on closed tracks.

The standard M Compound brakes have been newly developed for the 2021 BMW M3 and M4 and feature front six-piston fixed-caliper brakes with 380 mm discs and rear single-piston floating-calipers with 370 mm disks. The calipers are painted in blue metallic but may be ordered in black or red; all with the M logo.

The optional M Carbon ceramic brakes deliver even stronger braking power with greater fade resistance, enhanced thermal stability and extremely high resistance to wear. Their gold painted calipers are complemented by front 400 mm discs and rear 380 mm disks.

A shared feature of both brake variants is the integrated braking system. Thanks to this cutting-edge technology, the brake actuation, braking force assistance and braking control functions are brought together within a compact module. The brake pressure required is produced by an electric actuator. As a result, brake pressure is generated more dynamically and ensures significantly quicker and more precise inputs from the driving stability control system. The integrated braking system allows vehicle deceleration to be adjusted more precisely to the driver’s requirements. And feedback from the brake pedal is unimpaired by wet road surfaces, significant lateral acceleration or high brake temperatures, giving the driver superb brake feel in all situations.

The M-specific version of the integrated braking system presents the driver with two pedal feel settings, COMFORT and SPORT. Both modes alter the amount of pressure on the brake pedal required to slow the car. The driver can therefore choose between more comfort-oriented and particularly direct, instantaneous response when braking. Their preferred mode is selected via the M Setup menu.

The new BMW M3 and M4 are equipped with newly designed forged M light-alloy wheels, 18-inches in front and 19-inches in rear. Non-runflat performance tires sized 275/40ZR18 front and 285/35ZR19 rear complete the standard package. The Competition models feature forged M light-alloy 19-inch front and 20-inch rear wheels 275/35ZR19 and 285/30ZR20 non-runflat performance tires.  Polished rim edges accentuate the size of the light-alloy wheels.

The DSC functions in the new BMW M3 and M4 work in tandem with the integrated braking system. Along with the Anti-lock Braking System (ABS) and Cornering Brake Control (CBC), whose M-specific set-up helps to maximize precision, the integrated braking system also assists the stability control function in reducing oversteer or understeer, A full suite of supporting system including Automatic Differential Brake (ADB-X), Brake Assist, Dry Braking and Start-Off Assistant functions bring additional benefits to both performance and more casual driving situations.

The newly designed control systems allow for more precise stabilizing adjustments to the engine’s output. The integrated wheel slip limitation function brings about noticeably more sensitive acceleration control on wet, snow-covered or icy surfaces or on roads with varied levels of traction. The slip control function has been relocated from the DSC control unit to the engine management system. It therefore acts on the engine’s output up to 10 times quicker than before. This proactively avoids power-limiting inputs in response to excessively high revs. The car can therefore accelerate with more torque control on rough surfaces, for example.

The driver can also activate M Dynamic Mode in the new BMW M3 and M4 by using a button on the center console. This mode allows a greater degree of wheel slip, enabling a very dynamic driving while still preserving the functions of DCS if needed.

Selecting the optional M Drive Professional brings the new M Traction Control function. Making its debut in the new BMW M3 and M4, this new traction control allows the driver to set the intervention thresholds for wheel slip. The iDrive menu for this system displays ten stages of defined permitted wheel slip. The new traction control option gives the driver the ability to select the ideal balance of racing-car performance and directional stability for the situation, the road conditions and their personal preferences. This allows them to approach the limits on the track by reducing the extent of control system inputs in stages.

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  Article Image gallery (24) Specifications