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Twin turbo for the next Audi S4?
By Yoann Besnard on 8 November 2007 | 
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The future Audi S4 might not get the detuned V8 4.2 FSI used by the Audi S5 (as previously thought?). According to insiders, the S4 is set to inherit an all-new 3.0 litre V6 FSI. Audi engineers are also likely to add a couple of turbochargers, just like BMW has done with the BMW 335.
While the twin turbo chargers seem an obvious choice, some insiders have revealed that Audi is also considering a supercharger. If true, it would mark Audi's first supercharger in recent years.
No information is available regarding the power but expect at least 300 bhp and probably greater power than the BMW 335 in order to compensate for the weight added by the all-wheel drive system. The future S4 might also get the new Sport Differential Quattro system unveiled last September. The new system distributes torque from the engine independently between the rear wheels, improving the traction. All-wheel drive cars always suffer from understeering. Aware of the problem, Audi engineers have worked on reducing understeering to almost nil. In its normal mode, the Quattro system delivers 40% of torque to the front wheels and 60% to the rears. The user is able to select from three modes: 'comfort mode' focusing on stability, 'auto mode' offering a balance between stability and handling and 'dynamic mode' focusing on the best handling to the detriment of comfort.
The Audi will be unveiled at either the next Geneva Motor Show or the next Paris Motor Show.
Source: Fourtitude
