Audi S4 and Audi S5, before the compressor, the now turbo: why Audi has redesigned its 3.0 V6 TFSI?

The variants most sporting of the models Audi A4 and Audi A5, known as the Audi S4 and Audi S5, have been presented with an engine 3.0 V6 TFSI completely new that buries forever the previous 3.0 V6 TFSI. But if you share name, how is it that we speak of a complete revolution. This new engine 3.0 V6 TFSI signed by Audi is much more than a new engine, is the abandonment of the compressor volumetric in favor of the turbocharger, in addition to an important change of direction in the Volkswagen Group. Let’s discover the why.

Dynamic photo,  Colour: Misano Red

1 – To improve the efficiency of the V6 TFSI

In order to reduce consumption and emissions, the compressor always delivers a handicap that the turbocharger does not have

The previous 3.0 V6 TFSI was a design of impeller 100% Audi. Was an engine developed by Audi for use in different schemes of propulsion, both on the Audi, as in Volkswagen and Porsche. The choice of a system for the compressor at that time was defended as the most convenient solution to supercharge a gasoline engine that needed a functioning progressive and less technical complexity than a turbocharger. We have to take into account that this engine 3.0 V6 TFSI was used by both models as the previous Audi S4 with 333 HP, as for a Porsche Cayenne S E-Hybrid. Her virtue was no other than that of being a engine wild card, able to adapt to all kinds of uses.

But if the use of compressors has a problem, that is the higher consumption that provides compared to a turbo engine. The principle of operation of the reciprocating displacement compressors is not another feed of the rotation of the crankshaft, subtracting energy to it and being conditioned by its rotation. With the tightening of the laws anti-pollution, reduction of emissions offered by the turbocharger is required use.


2 – To offer better benefits

The new technology of supercharging has been condemned to the compressor traditional to use very small

The compressors have legions of fans, his performance is very good, especially if we look for engine torque from very low laps. The american culture has shown us that there is nothing better than to join a block V8, large-capacity coupled to a compressor volumetric to be the king of the quarter mile, but turbochargers have evolved enough so that its use is almost as nice as a compressor, ensuring a range of services in almost all of the tachometer.

If you talk to a good trainer, especially of those that have touched all kinds of cars, when speaking of overfeeding will ask you what you prefer: what Power or torque? The compressor is characterized by offering a few engine very high, it is the best system to get the engine strong in the low zone and half of the cuentavueltas. By cons, turbochargers work much better in the middle and upper areas of the rev counter because of its dependence on the exhaust gas. The perfect solution would be to merge both systems, or not, then using systems Twin-Scroll as is the case, schemas, Twin-Turbo or turbos electric we get a result equal to, if not better.

As an example, the new Audi S4 reaches 354 HP of maximum power, 21 HP more, having 500 Nm of peak torque, 60 Nm more, available from 1.370 to 4,500 rpm. With all this, the improvement in efficiency is 5% with respect to the Audi S4 above.


3 – To reduce costs and serve to Audi, Volkswagen and Porsche

Modular design made in Porsche. The V6 and V8 gasoline now comes from Stuttgart

And as it could not be otherwise, is also the economic issue. In the Volkswagen Group are very focused on the reduction of costs and in the application of economies of scale to supply mechanical to all of their manufacturers. If the previous 3.0 V6 TFSI (supercharger) was created by Audi for use in all brands of the group that needed it, the new 3.0 V6 TFSI has been developed in collaboration with Porsche and derived from the new V8 engine of 550 HP from Porsche that will be released in the Porsche Panamera.

we Speak of an engine that is based on the idea of a single cylinder, 500cc, and hence may be removed as may be necessary. Both the 3.0 V6 TFSI as the new V8 gasoline share angles between panels with 90ΒΊ. In the 3.0 V6 TFSI will get to see versions Twin-Turbo, although very probably the future Audi RS5 of the leap to a V8 engine supercharged, new development, leaving behind its current 4.2 V8 maximum power of 450 HP and going long of the 4.0 V8 TFSI that used Audi and Bentley, to host a customized version of the new V8 engine developed by Porsche.

Source: Audi | Porsche