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Lightweight, efficient, powerful: a new Audi turbo engine for a DTM

Following about dual and a half years of growth and some 1,000 hours of dynamometer testing, a new Audi competition engine is prepared for a initial racing deployment on May 4 during a Hockenheimring. “Our drivers were totally anxious right in a initial test,” says Head of Audi Motorsport Dieter Gass. “However, a pierce from a naturally aspirated V8 to a turbo engine is not usually critical due to a additional outlay of some 100 horsepower. In a DTM, we’re now pulling with a high-efficiency engine of a form we’re also regulating in many prolongation vehicles of a Group.”

The new Class 1 Regulations of a DTM are geared to pinnacle efficiency. Just like in production, a plea is to remove a limit from a accessible fuel by high application and unequivocally good efficiency. In a DTM, a volume of fuel is singular to 95 kilograms per hour. “That might sound like a lot but, in perspective of some-more than 610 horsepower, it unequivocally isn’t,” says Ulrich Baretzky, Head of Engine Development during Audi Motorsport. “The specific expenditure of a DTM engine is intensely low and now within ranges that used to be standard for diesel engines. In terms of weight and lightweight pattern – generally in a context of avoiding CO2 emissions – we’re indicating out a few approaches that will hopefully find their approach into destiny road-going vehicles – like in a box of a initial TFSI for Le Mans and a TDI.”

The compress four-cylinder turbo engine with gasoline approach injection (TFSI) usually weighs 85 kilograms and so usually half as most as a naturally aspirated V8 engine that was formerly used in a DTM. As a result, a dry weight of a Audi RS 5 DTM has forsaken to reduction than 1,000 kilograms. The power-to-weight ratio is now about 1.6 kilograms per horsepower.

Like in a past, a DTM engine has to final for a full season, so it is designed to run for some 6,000 kilometers. “The format of a DTM is a good challenge,” says Stefan Dreyer, Head of Powertrain Development during Audi Motorsport. “The prolonged mileage, distributed to many events with brief runs, is unequivocally tough. Plus, a four-cylinder engine’s quivering function totally differs from that of a V8. That acted a outrageous plea during a growth of a engine and also to a dynamometers.” Additional outlay of some-more than 100 horsepower, as good as aloft torque, put a larger bucket on a whole powertrain.

Due to a supposed “push-to-pass” system, a motorist can use a short-term engine energy boost by pulling a button, for instance in an overtaking maneuver. Via a bypass of a fuel upsurge restrictor (FFR), an additional 5 kg of fuel per hour is provided, that formula in a boost of about 30 horsepower.