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TinmanMS6
04-25-2008, 04:21 PM
When the next generation Audi S4 makes its expected debut sometime in 2009 as a 2010 model, it will lose its snarling V8 for a more fuel-efficient forced induction V6, like the previous-generation, B7-chassis car. While such a move was foreseen, at the Vienna Motor Symposium, Audi revealed some details on the engine. A supercharger will sit under the hood of the European and North American S4, which is due out this fall. Power is rated at 350 horsepower, but fuel economy will be much improved over the outgoing S4's 340hp 4.2-liter V8.

The engine will make its debut in the A6, although in slightly detuned form, producing 290 hp and 310 lb-ft of torque. The A6 is due out this fall, with the S4 not far behind, according to Germany's Auto Motor und Sport.

The new S4 will be lighter as well, as the B9 A4 body is about 100lbs lighter than the outgoing model and the two will share body panels. An active differential sourced from Magna will be able to distribute power on demand between wheels on the same axle is also expected to be part of the package to help the all-wheel driver handle like a rear-wheel drive vehicle. The same differential will make its way into the company's Q5 SUV and S5 GT coupe as well.

Audi's move back to forced induction is in tune with a recent prediction turbocharged gasoline engines will double by 2013 on account of the gas savings they offer.

nealric
04-25-2008, 04:26 PM
Hmm I heard rumors that they were just refreshing the v8.

lasermp5
04-25-2008, 04:36 PM
So how on earth will the next generation S4 ever hope to compete with the new M3 with only 350hp??? Guess they're leaving the task to the RS4?

TinmanMS6
04-25-2008, 04:41 PM
The RS4 and M3 have always been more direct competitors. Those are the two that get put head-to-head in magazine comparisons. The S4 is a little closer to the 335i.

jred321
04-25-2008, 04:42 PM
forced induction > more cylinders

TinmanMS6
04-25-2008, 04:48 PM
forced induction > more cylinders

I've always preferred the reliability of less moving parts, but I'm starting to come around lately.

jred321
04-25-2008, 04:57 PM
which one has less moving parts?

mikeyb
04-25-2008, 05:07 PM
S4 = 335i and G37c.

TinmanMS6
04-25-2008, 05:09 PM
which one has less moving parts?

Not the turbo.

Rogue
04-26-2008, 08:57 PM
on the contrary, adding a turbo to a V6 only adds 2 moving parts: turbine and waste gate. Adding 2 more cylinders adds 2 pistons, 2 rods, 2 sets of bearings, 4 valves, 4 valve springs, so on and so forth.

TinmanMS6
04-26-2008, 09:08 PM
on the contrary, adding a turbo to a V6 only adds 2 moving parts: turbine and waste gate. Adding 2 more cylinders adds 2 pistons, 2 rods, 2 sets of bearings, 4 valves, 4 valve springs, so on and so forth.

I'm guessing this turbo's going to be a bit more complicated than your setup. I would be surprised if it weren't a variable geometry turbo or something along those lines.