It’s not possible to expect it in a car on the road.
DTM Class 1 race cars will be subject to stringent engine requirements starting in 2011. The regulations require modern turbocharged engines that are more efficient and less fuel-intensive. Each car is limited to 25 gallons (95 kg) of fuel per hour. However, Audi engineers are not affected by the new regulations. The team’s turbocharged 2.0-liter engine generates 610 horsepower (454 megawatts). The development of the 2.0-liter race engine required two and a quarter years of testing and over 1,000 hours of dynamometer testing. It is designed to last for a full season, which means it covers 3,720 miles (6,000 km). The engine also features a push-to-pass feature that provides a temporary boost of 30 horsepower (22-kW), allowing drivers to quickly overtake. Audi’s new engine will race debut at Hockenheimring, May 4, 2019, under the Audi RS5 DTM car. The same RS 5 DTM had a naturally aspirated engine twice its size – a 4.0 liter V8 – but produced only 500 hp (372 kW) last year.
“Our drivers were absolutely thrilled right from the start,” Head of Audi Motorsport Dieter Gass said. The turbo engine has a 100 horsepower more power and is therefore important. We are now using a high-efficiency engine that we also use in many Group production vehicles, the DTM.
The new four-cylinder has a key advantage: It is light. The new four-cylinder weighs in at 187 pounds (85 kgs), which is half the weight of its predecessor V8. The Audi RS 5 DTM now weighs in at just over 2,200 pounds (1,099 kilograms). This makes the power-to-weight ratio approximately 3.5 pounds per horsepower (1.6 kg per horsepower) – Bugatti Veyron SS territory. All of you readers will have the same question: Will this engine ever make it to a road vehicle? Unlikely. Audi released a limited edition A5 DTM Edition in 2016. It didn’t feature the same 4.0-liter V8 engine as the race version. A 3.0-liter six-cylinder engine with 270 horsepower (201 kW) was the most powerful offered in that road-going edition.