DTM | Audi A5 DTM

3 Jan 2015 | Author: | Comments Off on DTM | Audi A5 DTM
Audi A5

Audi A5

DTM

The Audi A5 DTM, which was developed under the project name ‘R17’ internally at Audi Sport, complies with the new technical regulations that come into force for the 2012 season. At the same time the responsible parties also targeted three premises: car safety, a cost reduction of up to 40 per cent and a spectacular appearance.

The final aspect is visible at first glance. The Audi A5 DTM appears lower and squatter than its predecessor the A4 DTM with which Audi won five of the last eight DTM titles. A new and innovative chassis in hybrid design hides under the bodywork manufactured entirely from carbon. With its front, rear and lateral crash elements the combination of carbonfiber monocoque and steel roll-cage sets new standards with regard to safety for a racing touring car.

Furthermore, the chassis, which weighs just 160 kilograms, is one of about 50 identical components shared by all DTM cars.

“Thanks to these standard parts it was possible to achieve the targeted cost reduction of up to 40 per cent while still improving the safety and appeal of DTM cars,” says Head of Audi Motorsport Dr. Wolfgang Ullrich under whose supervision the new Audi A5 DTM was developed.

The A5 DTM is 5.01 meters long, 1.95 meters wide and only 1.15 meters high. The wheelbase of every DTM car is a uniform 2.750 millimeters. Like its predecessor, the A5 DTM is powered by a near 340 kW (460 hp) Audi Sport V8 engine. A new development with partner Hewland is the six-speed gearbox now activated pneumatically via shift paddles mounted on the steering wheel.

When compared to a classic manual shift, the more precise gear shift procedure facilitates a significant increase in gearbox service life of up to 24,000 kilometers.

The Bosch MS 5.1 engine electronics, which function without fuses, and the central display already used in the Audi R8 LMS are also state-of-the-art. The exclusive tire partner Hankook supplies larger and wider tires the dimension of which resemble those used on LMP2 sportscars. Integrated into the Audi A5 DTM carbon fiber cell is a 120 liter safety fuel tank with which the current DTM race distance can be completed making a stop for fuel – since refueling during a DTM race is no longer permitted for safety reasons.

“In general new standards are set with the cell,” explains Stefan Aicher, Head of Vehicle Design at Audi Sport. “The monocoque weighs only 126 kilograms, the roll-cage 32.5 kilos. At the same time the safety standards have increased dramatically. The design is extremely stable when subject to not just frontal, longitudinal crashes but also side impacts.

The entire sidewall must withstand a force of 360 kN during the side impact test, this equates to around 36 tones. By way of comparison, this value was 80 kN for the A4 DTM, which demonstrated its high safety standards in several spectacular accidents.”

Only the engine subframe at the front and gearbox at the rear restrict the engineers’ freedom as far as the suspension geometry is concerned. The suspension pick-up points must be mounted to these standard elements. In addition, the material, steel, and tube dimensions are fixed and numerous dimensions defined by the regulations – the wheels for example.

Aerodynamic possibilities were also restricted. Air flow through the bodywork as seen on the A4 DTM and complex additional winglets at the rear are now prohibited.

Visual similarity to the production line model is significantly greater as a result and, at the same time, the new DTM cars should react less sensitively to contact and create a better slipstream – also thanks to the larger rear wing.

“Audi had very innovative solutions in the past in the DTM and especially for the aerodynamics,” says Dr. Martin Mühlmeier, Head of Technology at Audi Sport. “Since these areas were strongly restricted it is now more about detail solutions to acquire an advantage over the competition. Audi was also always a trendsetter in these areas over the years. I think that we’ve found interesting and innovative details solutions once again.”

Project ‘R17’ began in May 2010, a month later the green light was given to use the A5 as base model. Tests in the model wind tunnel have been running since February 2011. The roll-out was completed on 29 July 2011. Afterwards, the intensive test program started at various European race tracks and continued to the Deutscher Motor Sport Bund (DMSB) homologation date on March 1, 2012.

Since then, the most important technical aspects on the new DTM cars were frozen for the rest of the season – including the still all important aerodynamic configuration.

As usual, for this reason, all three manufacturers kept their final aero configuration as secret as possible to the last moment. “In the DTM this year even more value is attached to every tiny detail than ever before,” knows Dr. Wolfgang Ullrich. “And, it goes without saying that we have developed over the last few month we also wish to keep to ourselves for as long as possible.”

TECHNICAL DATA

Chassis:

CFRP monocoque with integrated fuel tank, CFRP crash elements on the sides, CFRP crash elements, front and rear Engine:

V8 normally aspirated engine, 90-degree cylinder angle, 4 valves per cylinder, air intake restricted to 2 x 28.0 mm by regulations Engine control unit:

Bosch MS 5.1 Engine lubrication:

Dry sump Displacement:

4,000 cc Power output:

Approx. 340 kW (460 hp) Torque:

Over 500 Nm Drive system:

Rear-wheel drive Clutch:

4-plate CFRP clutch Transmission:

Audi A5

Sequential 6-speed sport transmission Differential:

Adjustable multi-plate limited slip differential Drive shafts:

Constant-velocity (CV) shafts Steering:

Power-assisted rack and pinion steering Suspension:

Independent front and rear, twin A-arm suspension, push rod system with spring/damper unit, adjustable gas pressure dampers Brakes:

Hydraulic dual-circuit braking system, monoblock light metal brake calipers, ventilated carbon fiber brake discs, front and rear, brake force distribution between front and rear continually adjustable by the driver, electromagnetic starting valve Rims :

Forged aluminum rims, front: 12 x 18 inches; rear: 13 x 18 inches Tires:

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

5,010 mm (incl. rear wing) Width:

1,950 mm Height:

1,150 mm Minimum weight:

1,100 kg (including driver) Fuel tank capacity:

Audi A5
Audi A5
Audi A5
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