Audi stuffs the turbo lag

Malmö, July 25, 2014

This is the most powerful diesel Audi, which is available at the moment: the RS 5 TDI concept. RS 5? Diesel? Yes, RS 5 TDI. Unfortunately, only a test vehicle. The Ingolstadt have in fact taken the RS 5, the 4.2-liter V8 gasoline lifted out and placed into the three-liter V6 diesel from the A6. The house has from 313 hp and 650 Newton meters juicy. The specimen in the RS 5 TDI but modified and demonstrated the latest Power technology in the diesel sector: the electric compressor. As a secret weapon he is the infamous turbo lag, nag number one in turbo engines eliminate. Will this succeed?

Delay when starting

With a normal turbo engine, it 's like this: When starting the car the Steeds solves a bit tough from the ground, only from about 1,000 trips pull mightily. And while driving it means diligently Turn to keep the machine at speed - freak. Blame for this partial weakness is the turbo lag. It arises because a turbo engine gets its momentum from the boost pressure builds up to the turbocharger. The loader is still dependent on the energy of the exhaust gas and is to come! Times until a higher number of revolutions with gusto on the turbine wheel to.

Compressor engages at very low revs

With the electric compressor Audi plans to move the weak point of the turbocharged compression-ignition engine to body. The only handball great part is located after the intercooler. At very low speeds, when the exhaust stream is still powerless, the air via a bypass damper is first passed through the compressor. The compressor wheel will be accelerated by a small electric motor within 250 milliseconds at maximum speed, and so the air can immediately be pressed into the combustion chambers. As a result, the torque is increased tremendously during start-up, even the annoying switching back? for example when overtaking? is reduced.

750 Newton meters from 1250 tours

On a race track in Sweden wants to prove that the RS 5 TDI the fine art of compression already dominates us Audi. The modified engine delivers 385 hp and 750 Newton meters, the maximum torque is already at 1,250 trips. According to Audi, the diesel-RS runs in about four seconds to 100 and creates over 280 km / h. Even the values ​​alone can tingle the right foot. To demonstrate the strength of a racing start on the program. This is not the classic everyday situation of a TDI driver, but when it Mutti does not see? The opponents at the traffic light duel is an RS 6 Avant. And to whom I want to have any chance with my RS-Diesel? 560 hp and 700 Newton meters are strong counter-arguments. My co-driver, an Audi engineer, counts down from three, with " Los " I kick the pedal to the floor plate. The driver next door in the RS 6 also. I can do it actually, the gasoline-powered cars ahead of the Loss gingerbread on the first meters of a nose. Only then will win the much stronger RS 6 country. I find that very impressive, even if I am a similar diesel without compressor would have been better as an opponent to have a better comparison.

Soon in series

The explosive force deployment at the first gas shock and the vehement propulsion when accelerating out of the turns of the track show that the compressor does the job. Practically at any speed depends on the Audi greedy gas, the power is also at low revs immediately. The turbo lag is really crammed. Because of course, the question becomes noisy when many diesel drivers will enjoy the additional Beatmers. From Audi there is already the answer, even if it is vague: in " the near future " to be offered in the TDI sector compressor technology, an application would, however, could also emerge in the gasoline engines.

48-volt power supply

With the compressor another novelty is used: the 48-volt power supply. In the RS 5 TDI concept, it is already installed. The principle is simple: in boost phase is recovered by regenerative braking energy, which saves a compact lithium-ion battery. For this battery, the motor of the compressor is not only fed, but in the future also refer powerful loads as thermoelectric heaters, electro-mechanical rear brakes or oil and water pumps from here their juice. The higher voltage also allows lower currents? by the cable cross-sections smaller and the weight of the car to be lowered. Also, the 48 - volt power is soon to come in several Audi model series. It remains an open question as to when and whether the most powerful Audi diesel drives an RS 5. Ingolstadt is silent on this issue. We remain excited and hope . (HD)