Cars and specifications
The cutaway DTM car.
The DTM is a mass-produced touring car. The championship controls and specifies the chassis/car and engine manufacturers that teams are allowed to use each season. The league's choice of manufacturers are changed every three years. Currently Audi, BMW and Mercedes-Benz provides the cars to all teams, with Audi, BMW and Mercedes-Benz providing the engines respectively. Opel has provided cars and engines in 2000-2005 but left at the end of the 2005 season. The Deutsche Tourenwagen Masters cars closely resemble public road vehicles but heavily modified into a race version.
During the first inaugural resumption season, all DTM car styles were utilized shorter two-door coupé-style cars until 2003 season but in 2004 coupé-style cars were minority due to the transition to four-door sedan saloon-style cars. In 2004 the four-door sedan saloon-style cars were introduced due to touring car's philosophy (several touring car racing tournaments have a de facto 4-door sedan saloon cars) until 2011. For 2012 season onwards the two-door coupé-style cars were returned until to date but the two-door coupé-style cars are much more different than 2000-2003 cars (longer length, longer wheelbase, slightly lower height and aggressive aero package).
The updated new coupé-style cars were introduced in 2017 thanks to new rear wing.
The cars are supposed to be fast and spectacular, while still fairly cheap to build and run. All DTM race cars have RWD and 4.0 L V8 engines which are air-restricted to 460 hp but now into over 500 hp since 2017 season, no matter if similar layouts or engines are available in the road cars. Instead of the road car bodies, unrelated purpose-built chassis are used, which are closer to prototype racing. Many drivers have in fact described the handling of the cars as closer to single seater racing cars than road cars.
Only the roof sections of the road cars are put on top of the roll cages, and lights and other distinctive design features are used in order to provide a resemblance to the road cars. Also, in order to save money and provide close racing, many common parts from third party specialists are used, like transmission (from Hewland), brakes (from AP Racing), wheels (from ATS) and Hankook tyres (see below). The all-important aerodynamic configurations are tested in wind tunnels before the season, brought to an equal level, and kept that way throughout the season.
DTM cars adhere to a front engine rear-wheel-drive design (similar to public legal road car). A roll cage serves as a space frame chassis, covered by CFRP crash elements on the side, front and rear and covered by metallic bodywork. They have a closed cockpit, a bi-plane rear wing, and other aerodynamic parts such as front splitter, side winglets and hood holes (see also on Aerodynamics section for more details).
The price of 1 unit current DTM car is normally €600,000-1,000,000 complete.
All Deutsche Tourenwagen Masters cars aero packages are completely assembled. The car floor underbody is flat. Serratured side front fenders are included along with triple-decker front side winglet flicks, multiple side winglet flicks and multiple rear winglet flicks. The current rear wing of all Deutsche Tourenwagen Masters cars are slightly wider, bi-plane wing and also parallelogram rear wing end plate. DTM cars have included a Drag Reduction System since the 2013 season (similar to Formula One) for helping the driver to overtake the other opponents.
Transmission, gearbox and clutches
For the transmission gearboxes, all DTM cars currently use a semi-automatic transmission with 6-speed gearbox operated by paddle shifters and supplied by Hewland Engineering since the 2012 season. From 2000 to 2011, all DTM cars used sequential manual transmission with a 6-speed gearbox operated by the gear lever. The clutch of all DTM cars are CFRP 4-plate clutch operated by foot-pedal and provided by ZF. Mechanical limited-slip differential are also allowed and constant velocity joint tripod driveshafts are also used. All Deutsche Tourenwagen Masters cars drivetrain are currently front-engine with rear-wheel-drive layout.
AP Racing supplies monobloc brake calipers, carbon brake discs, pads and disc bells, which are exclusive to all Deutsche Tourenwagen Masters cars since 2000. The carbon brake discs are thicker for improving braking power while approaching sharper corners.
The suspension of all Deutsche Tourenwagen Masters cars is upper and lower wishbones, pushrod operated and coupled with adjustable gas pressure dampers.
ATS exclusively supplies wheel rims for all Deutsche Tourenwagen Masters cars since the 2017 season. Previously O.Z. Racing, BBS and AMG were wheel rim suppliers per manufacturer. The wheel rims of all DTM cars are made of magnesium alloy wheels.
Hankook is currently the sole tyre supplier for the series since the 2011 season until at least 2019. Previously Dunlop Tyres was the tyre supplier of DTM from 2000 to 2010. The DTM runs the bespoke compounds and same size as LMP and GT cars since 2000 and re-profiled in 2012. The front tyre sizes are 300/680-R18 and the rear tyre sizes are 320/700-R18. The compounds of Hankook Deutsche Tourenwagen Masters tyres are 3 dry compounds and 1 wet compound.
Interior and other safety components
For the safety equipment, all DTM cars seating uses removable carbon-fibre shell driver's seat with 6-point seat belts. The steering wheel of all DTM cars are free design per one manufacturer with multiple buttons (similar to Formula One). All DTM cars are also equipped with Bosch Motorsport DDU 8 data display units since the 2012 season. The fire extinguisher of all DTM cars are included in the bottom right-hand side underneath.
The cockpit of all DTM cars are fully protected by doors, windshields and roofs (shielded by polycarbonate glass for windscreen, side windows and rear windows including also windshield wipers for rain weather only in the windscreen) because of current coupé-type car.
The fuel tank of all DTM cars are made of kevlar-reinforced rubber safety tank supplied by ATL. Currently the fuel tank capacity of all DTM cars are 120 litres (32 US gallons) since 2012–present. Previously, the fuel tank of all DTM cars were 65–70 litres (17–18 US gallons) in 2000-2011.
All DTM cars carry a Bosch-provided electronic control unit (Motronic MS 5.1 model). Live telemetry is used only for television broadcasts, but the data can be recorded from the ECU to the computer if the car is in the garage and not on the track.
Rear view mirrors for all DTM cars are fully mandated to easily viewing opponents behind.
The cars were powered by naturally-aspirated (no turbocharger and supercharger) indirect-injected stock block V8 engines, with aluminium alloy blocks, 2xDOHC valvetrain actuating four-valves per cylinder and limited to 4.0 L (244 cu in) displacement since the series' rebirth in 2000. DTM car engines are currently producing over 500 hp (373 kW; 507 PS) power output at 8,500 rpm. Audi, BMW and Mercedes-Benz are currently providing DTM engines with the manufacturers respectively. The engines of all DTM cars are close-resemblance to public vehicle road cars but heavily modified to DTM race version.
DTM engines were rev-limited to 9,000 rpm. The valve train is a dual overhead camshaft configuration with four valves per cylinder. The crankshaft is made of alloy steel, with five main bearing caps. The pistons were forged aluminum alloy, while the connecting rods are machined alloy steel. The firing ignition was a CDI ignition system. The engine lubrication was a dry sump type, cooled by a single water pump.
All Deutsche Tourenwagen Masters cars will switch from outgoing 4.0 L (244 cu in) V8 naturally-aspirated indirect electronic injection to an all-new 2.0 L (122 cu in) inline-4 cylinder turbocharged direct injection engine from the 2019 season onwards called the "Class One" while the current coupé-style cars will remain from 2019 beyond. This will mark the return of turbocharger engines in 2019 season for the first time since 1990. The power output of all-new DTM engine will be increased from 500 to 600 hp (373 to 447 kW; 507 to 608 PS). Aston Martin, Audi and BMW will providing DTM new engines with the manufacturers respectively. The engine components are aluminium alloy blocks, DOHC valvetrain actuating four-valves per cylinder and limited to 2.0 L (122 cu in) displacement. The new push-to-pass system will be introduced in 2019 to improve racing spectacle and will produce about 30 hp (22 kW).
All Deutsche Tourenwagen Masters cars carried a spark plugs are made of iridium and supplied exclusively by Bosch since 2000.
The exhaust systems of all DTM cars are silencer type but made of titanium with operation of three-way catalytic converter. Currently Akrapovič (Audi and BMW) and Remus (Mercedes-AMG) are providing the exhaust systems.
At its inception, all the DTM cars currently use ordinary unleaded racing fuel, which has been the de facto standard in German touring car racing since original DTM 1994 and the reborn of DTM in 2000 (previously the original DTM were used leaded fuels in 1984-1993). Since the 2010 season, the fuel of all DTM cars is currently Aral Ultimate 102 RON unleaded racing fuel. In 2005-2010, the Aral Ultimate 100 RON unleaded fuel was used for all DTM cars. From 2000 to 2003, Agip was providing an unleaded fuel for all DTM cars. From 2004, all DTM cars were fueled by Shell until mid-2005, when they switched to Aral Ultimate 100 RON unleaded racing fuel.
Current Aral Ultimate 102 RON unleaded gasoline is resemble the ordinary unleaded public vehicles gasoline which has better mileage, environmental-friendly and safer than other fuels.
The car also features internal cooling upgrades, a new water radiator, radiator duct, oil/water heat exchanger, modified oil degasser, new oil and water pipes and new heat exchanger fixing brackets. PWR is the current DTM cooling component supplier since 2000.
According to research and pre-season stability tests, the current model can go 0 to 100 km/h in approximately 2.6 seconds. The car has a top speed of 270 km/h (168 mph) meaning that it is the second fastest touring car behind the Australian V8 Supercars.
Balance of Performance
In 2015, Deutsche Tourenwagen Masters were introduced the Balance of Performance (BoP) weight to improve racing spectacle. The Balance of Performance (BoP) weight regulations were the car weight allowance range must be 2,436–2,513 lb (1,105–1,140 kg) in 2015-2016 later changed to 2,414–2,513 lb (1,095–1,140 kg) from the mid-2017 season. The Balance of Performance (BoP) weight regulations were scrapped just before the Austrian race due to several protests and criticisms from DTM teams.
Driver aids like ABS, traction control, launch control, active suspension, cockpit-adjustable anti-roll bar and partial car-to-team radio communications are currently prohibited except fuel mapping and Drag Reduction Systems, which can only be used for 12 laps in 2018 when near enough.
The safety is very important for all Deutsche Tourenwagen Masters drivers. Race suit, Nomex underwear, gloves, socks, boots and headsocks are requiredly by driver. Meanwhile, the helmets for all Deutsche Tourenwagen Masters drivers are made of carbon-fibre shell, lined with energy-absorbing foam and Nomex padding. The helmet type must meet or exceed FIA 8860-2010 certification approval as a homologation for all auto racing drivers. HANS device are required by Deutsche Tourenwagen Masters drivers since 2002 season that meets or exceeds FIA 8858-2010 certification approval. Earpieces also required by Deutsche Tourenwagen Masters drivers to improve communication listening.