Driven 2012 Audi A6 3 0 BiTDI electric biturbo Prototype Fourtitude com

20 Фев 2014 | Author: | Комментарии к записи Driven 2012 Audi A6 3 0 BiTDI electric biturbo Prototype Fourtitude com отключены
Audi A6 Electric Cars

4T. Reviews Road Tests

George Achorn

16 October

It’s fair to say Audi a lot about turbo lag in the ‘80s. Go and google ‘Walter Rohrl video’ (or watch HERE ) and see why. Back then, a turbo was used to boost a single turbo that had to be spooled up by exhaust gases. The the turbo used, the more However, the bigger the turbo meant the longer the wait for power.

As a result, drivers Rohrl had to keep the revs up in to keep power on tap. For the Cooper of rally car driving, was hardly a problem though lag is less than optimum in driven cars where a of driver experience naturally

By the launch of the B5 S4, Audi found a way to back turbo lag. to a V6 instead of the old I5 allowed engineers to two smaller turbos to each each spooling up power The stock B5 S4 boasted plenty of without all of the fancy footwork. In current engines, Audi has their biturbo designs to a degree that they power delivery much of engines with higher and more cylinders, all while efficiency by a significant margin. 4.0 TFSI in the S6, S7 and S8 is exemplary of this.

So too is the 3.0 Bi-TDI (biturbo TDI) in the SQ5 and A6 sold in Europe.

In particular, the 3.0 is one hell of an intriguing engine. performance diesel mill Audi boasts 313 hp (230 kW) and 479 (650 Nm) of torque between rpm. Even as a diesel, engine is a proud member of the per liter club at 105.5 hp per yet in the A6 it is still capable of 36.75 mpg liters per 100 km).

These are impressive to say the least, and explain why it was chosen to power Audi’s ever diesel S-car.

As an engine like the 3.0 Bi-TDI is, always room for improvement and engineers are experimenting with one intriguing new technology. Recently we had a to drive an A6 Bi-TDI development boasting a very interesting new fitted to this motor – an biturbo.

The idea of an electric biturbo is simple. On an engine like the 3.0 an electrically driven compressor replaces the smaller turbo. it looks much like a turbocharger, this compressor is not upon exhaust pressure in to ‘spool up’ and thus allows the management to choose when and how boost to implement independent of speed.

This electric is configured by integrating a small motor that is capable of its turbine up to very high in the blink of an eye. This is positioned ‘down wind’ of the turbocharger and intercooler in the path of the air. Under most charge air is routed around the turbo via a bypass, however the charge air is low in the larger conventional then the bypass closes and air is to the compressor.

We’re explained all of this as we a white A6 S-line out onto around Munich for a very test drive. Given car is a development mule, it has been with some interesting and switch gear – most one particular switch that one Axel Schwarz, an Audi and our co-pilot, to activate or de-activate the turbo. The setup makes it for the car to run either augmented with the new or deactivated and solely with a turbo.

Steering to an empty of road, the car feels much as expect a normal A6 3.0 TDI to feel. got no lack of power, but it’s not particularly urgent in its acceleration. We off a standing start with the conventional turbo in operation.

The car on at a brisk rate, and the impression of a US-spec 3.0 TDI is reinforced.

We stop and our co-driver flips the switch. time the launch is more and immediate. It’s not like an TDI is a slouch off the line anyway but notably more urgency in case.

Audi A6 Electric Cars

For reference, we have driven the SQ5 and the A6 with the Bi-TDI and this car decidedly more urgent off the

Our passes are kept to low-speed Given this is technically a prototype, Herr Schwarz to keep this test short and sweet. He explains that off-the-line acceleration is not the place the electric turbo this engine.

As TDI owners can the 3.0 TDI is no slouch off the line. Cruising at or Autobahn speeds though, a is optimally running low revs and like Audi’s 7-speed or 8-speed Tiptronic keep the low and efficiency high. Hit the accelerator at speed though and the TDI can feel until it builds up boost.

again, the electric turbo is to make a big difference.

We inquire Axel Schwarz about numbers compared to the 3.0 TDI or 3.0 Bi-TDI A6. He they’ve not yet tested the car in that and while we’re skeptical of statement the translation is likely more like, “those aren’t approved for publishing yet.”

Whatever. The car feels quite off the line. We just wish we test it at high-speed as well. that’s not part of the test

Regarding electric turbos, isn’t the only company with this technology. BMW a patent in 2011 and thus their intent for a similar There’ve been rumors Subaru may also employ a setup with the next WRX For now Audi isn’t divulging for its own production implementation though at current engine configurations it is not to guess. We’d put our money on the 3.0 going first, and this should also do great also for the 4.0 TFSI.

Theoretically engines like the 2.0 TFSI with a larger turbo benefit from such a in order to minimize lag and yet still for a larger turbo that boost the small engine big displacement power numbers.

Back to the situation at hand, our with the A6 quickly comes to an We head back to the restored building near Munich which Audi has staged test drive. Though technology and one born more for you can’t deny the smart gains of an electric biturbo.

Audi A6 Electric Cars
Audi A6 Electric Cars
Audi A6 Electric Cars
Audi A6 Electric Cars


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