BMW M4 DTM Racing Car Debut







Published by Gerald Ferreira Date: March 1, 2014
Categories: BMW, BMW Racing

The new challenger makes its debut: Preparations for the start of the BMW M4 DTM’s first season enter the finishing straight.

BMW_M4_DTM_Racing_Car_Debut

Munich (DE), 1st March 2014. The submission of the necessary papers  for the aerodynamic homologation of the 2014-spec DTM cars to the  Deutsche Motor Sport Bund (DMSB) also marks the end of a busy, and yet  exciting, period for BMW Motorsport. Development work on the BMW M4  DTM, which will compete in the forthcoming DTM season, has been in  full swing in recent weeks and months. As of today, it is no longer  possible to make modifications to fundamental areas of the car,  heralding a new phase of preparations for the start of the season in  Hockenheim (DE) on 4th May. The forthcoming tests will primarily focus  on optimising detailed aspects of the total package and understanding  how to exhaust the full potential of the BMW M4 DTM.

The new car will make public appearances out on the track at the  official ITR tests in Budapest (HU, 31st March – 3rd April) and then  at the final test in Hockenheim (DE, 14th – 17th April). Like last  year, the official presentation of all eight BMW M4 DTMs on 25th April  in Munich’s BMW Welt will provide BMW Motorsport fans with a  mouth-watering taste of what they can look forward to in the new season.

“Even before the BMW M3 DTM completed its final race last season, our  development team was already hard at work on the 2014 car,” said BMW  Motorsport Director Jens Marquardt. “Preparing a new car for the DTM  is a big challenge. In few other series is aerodynamics so important.  Even the slightest detail can make the difference between success and  failure. And this attention to detail shown by our engineers is  apparent at first glance – from the elongated bonnet with its steeply  sloping front and aerodynamically optimised wing mirrors, to the  contoured roofline that is a characteristic feature of the BMW M4.”

Marquardt added: “For me, the BMW M4 DTM is an absolute highlight.  Like its production counterpart, it looks fantastic and it also made a  positive first impression at our tests. Unlike when we were developing  the BMW M3 DTM for our return to the DTM in 2012, this time around we  were able to call upon the wealth of experience gained over the last  two seasons. Despite this, we still have a long road ahead of us – the  opposition have continued to develop their cars in the meantime. It is  important to continue gradually improving the new car and ensure we  can get the very best out of it, in order to be able to compete on a  par with our strong and experienced rivals right from the outset with  the BMW M4 DTM. I am confident we will achieve this. Every DTM fan can  already look forward to the first showdown in Hockenheim on 4th May:  only then will we know exactly how competitive the BMW M4 DTM really is.”

Presenting the BMW M4 DTM for the 2014 season:

BMW-DTM

Development. BMW Motorsport engineers started to  look ahead to 2014 and began working on the development of the new BMW  M4 DTM well before the start of the 2013 DTM season. The first model  made its first appearance in the wind tunnel at the BMW Group’s Aero  Lab on 22nd April – 13 days before the opening race of the 2013 season  in Hockenheim (DE). In the summer of 2013, while continuing with  aerodynamic testing, the experts in Munich (DE) turned their attention  to designing new suspension parts. The new components made their first  on-track outing in December 2013 – but still within the BMW M3 DTM at  that point. The final parts for the chassis of the BMW M4 DTM were in  production by the turn of the year, allowing the BMW teams to assemble  the first models of the new car in January and February. Three hundred  days after the first test in the wind tunnel, the BMW M4 DTM took to  the track for its track debut in Monteblanco (ES) on 11th February 2014.

The production version of the BMW M4 Coupé provided BMW Motorsport  with a perfect basis for developing the DTM racing car. Hardly  surprising, given the fact that the primary goal of the BMW M GmbH  engineers working on the BMW M4 Coupé was to create a robust car  suitable for use on the racetrack. Among those to make valuable  contributions towards achieving this goal were DTM drivers Bruno  Spengler (CA) and Timo Glock (DE), who took part in tuning tests at  the Nürburgring-Nordschleife (DE). “I am proud to have played my part  in the fine-tuning,” said Spengler. “The chassis of the BMW M4 Coupé  is very sporty. The feedback from the front axle is extremely direct,  and the grip on the rear axle is phenomenal. This car is the ideal  basis for our car in the DTM.”

Production. The last BMW M car to roll off the  assembly line at the main BMW Plant in Munich did so back in 1991.  After that, production shifted to BMW Plant Regensburg (DE). Almost 23  years later, the assembly process returned to the main factory – and  just a few metres away BMW Motorsport engineers were hard at work  tinkering with the racing version of the new car. However, the BMW  Plants in Regensburg and Dingolfing (DE) were also involved in the  development of the BMW M4 DTM. Among other things, the kilometre-long  test tracks at the modern production facilities were used for  aerodynamic tests. Throughout the development phase, the 2014 DTM car  was to be seen at what is otherwise the venue for the exhaustive  quality control checks performed on all BMW M cars.

Design. The BMW M4 Coupé and the BMW M4 DTM lie  low and flat on the tarmac. Even when stationary, the design’s  powerful contours underline the performance of the two brothers.  Characteristic design elements, such as the modern take on the twin  headlight arrangement and distinctive twin-bar kidney grille, ensure  that the car clearly stands out as a BMW M vehicle. The power dome on  the bonnet is equally striking. The side of the car extends the  dynamic impression created by the front end. The proportions typical  of the BMW M4 Coupé, such as the long bonnet, long wheel base,  set-back greenhouse and a short front overhang, formed the basis for  the low and aerodynamic silhouette of the BMW M4 DTM.

BMW-M4

Aerodynamics. Aerodynamics plays a vital role in  the DTM. For this reason, the BMW Motorsport engineers devoted a lot  of time to issues such as aerodynamic drag and air flow. As on the  production model, the air curtains at the front of the BMW M4 DTM are  designed to reduce air drag. Narrowing air ducts accelerate the  airstream flowing through the front skirt, guide it systematically  past the wheels, and reduce turbulence around the wheel arches.  Another new feature on the BMW M4 DTM is a plate along the side  channel, which lends the racing car an even more striking outline. The  eye-catching contoured roofline decreases the front surface area of  the BMW M4 DTM and further reduces aerodynamic drag. The flatter rear  window optimises the way the airflow approaches the rear wing. The  striking wing mirrors, with their twin-stalk mounts, are already a  striking feature of the production model, and the mirrors on the BMW  M4 DTM have also been aerodynamically optimised for the racetrack to  ensure they aid efficient airflow towards the rear of the car.

Lightweight construction. The BMW M4 Coupé  itself is a prime example of intelligent, lightweight construction.  The high-performance sports car weighs just 1,497 kilograms when empty   – that is a whole 80 kilograms less than its predecessor. This  reduction of weight has a positive effect on the driving dynamics and  consumption. This has been made possible by the extensive use of  lightweight materials, such as carbon fibre reinforced plastic and  aluminium. The use of carbon is also widespread in motor racing.  Virtually the entire body of the BMW M4 DTM is made of this  ultra-light and durable material. The weight reduction and consequent  lowering of the centre of gravity are key to the car’s performance on  the racetrack. The basic weight of the BMW M4 DTM, with driver, is  1,110 kilograms.

Safety. Like the BMW M4 Coupé, the racing  version also meets the highest safety standards. Over 50 of the 5,000  plus parts that make up the BMW M4 DTM are standard components, which  are used in all DTM cars. One of these is the carbon fibre monocoque,  which sets the benchmark in terms of safety in motorsport. With an  integrated tank, steel roll cage and additional crash elements, it  offers the driver effective protection in case of a crash. Parts like  the gearbox, clutch, dampers and rear wing are identical in all DTM  cars. This also keeps a lid on development costs.

Engine. The BMW P66 engine in the BMW M4 DTM  generates approx. 480 bhp with the air restrictor specified in the  technical regulations. It is made up of 800 different components,  consisting of 3,900 individual parts. When designing the DTM  drivetrain, BMW Motorsport took full advantage of the technological  know-how within the BMW Group. The high-tech foundry connected to BMW  Plant Landshut (DE) accounts for the large cast parts, such as the  cylinder head and crankcase – just as it does in the production of the  six-cylinder in-line engine for the BMW M4 Coupé. The cast parts are  coated and given the necessary heat treatment within the appropriate  departments in Munich. The BMW V8 for the DTM is both a sprinter and a  marathon runner. It allows the BMW M4 DTM to accelerate from 0 to 100  km/ in about three seconds. Only ten engines are permitted for all  eight BMWs over the course of the entire season. Therefore,  reliability is a prerequisite to success.

The engine’s power is transferred via a sequential six-speed sport  gearbox, which is operated pneumatically using shift paddles mounted  on the steering wheel. The gearbox is one of the standard components,  which are used by all the DTM manufacturers. It has 11 final drive  ratios, which allow the engineers and drivers to react to the  respective circuit and engine characteristics when setting the car up.

DTM-Racing-Car

Steering wheel. Additional status displays and a  customised layout of the controls make the steering wheel in the new  BMW M4 DTM even more comfortable for the drivers to use. The  individual buttons can be allocated as the driver desires. As with the  racing car, the gears on the BMW M4 Coupé can also be changed using  shift paddles on the steering wheel, depending upon the configuration.

Lights. Drivers of both the BMW M4 DTM and the  BMW M4 Coupé can rely on the performance of modern LED headlamps.  Light emitting diodes do more than simply save energy. Thanks to the  significantly shorter reaction time compared to conventional filament  lamps, the driver behind is given more notice when a driver in front  of him is braking. And every fraction of a second counts on the  racetrack. The light generated by LEDs is also very similar to  sunlight, making it particularly easy on the eye.

Technical data for the BMW M4 DTM.

Chassis: carbon-fibre monocoque with integrated tank  and steel roll cage; carbon-fibre crash elements on sides; carbon  fibre crash elements on front and rear

Length/width/height:4,775 mm/1,950 mm/approx. 1,200 mm

Tank capacity:120 litres

Engine:90° V8 aspirated engine, four valves per  cylinder, 2 x 28.0 mm air restrictors (in accordance with regulations)

Capacity:4,000 ccm

Output:approx. 480 bhp (with air restrictors, in  accordance with regulations)

Max. torque:approx. 500 Nm

Engine management system:Bosch MS 5.1 engine control  unit, central display

Transmission:Sequential 6-speed sports gearbox,  operated via pneumatic shift paddles mounted on the steering wheel;  4-plate ZF Sachs carbon-fibre clutch; adjustable multi-disc  limited-slip differential

Front axle/rear axle:Double wishbone axle with  pushrods and adjustable shock absorbers with six settings; H&R  coil springs

Brakes:Hydraulic dual-circuit braking system;  monoblock, light-alloy brake callipers; inner-ventilated brake discs  at front and rear; brake-force distribution can be adjusted by driver;  electromagnetic starting valve

Wheels:Forged aluminium rims; 18" x 12"  front, 18" x 13" rear

Tyres:Hankook; front: 300-680-18, rear: 320-710-18