North American VAG performance house STaSIS Engineering launches the Signature series of Audi enhancement packages in the United Kingdom with the Signature Series S4. STaSIS’ combination of cohesive powertrain, dynamic suspension and braking upgrades lifts the supercharged Audi S4 to the top of its performance class.
STaSIS engineers have developed the 2010 onwards Audi S4’s supercharged V6, 3.0-liter TFSI engine, boosting performance from a measured standard 333 bhp / 344 lb. ft of torque to a stimulating 410 bhp / 370 lb. ft. The STaSIS Signature S4 is now available from APS of Brackley in two versions.
The Touring Edition combines the significant power and torque increase with aggressive suspension and bespoke wheels to Audi's signature sports saloon to deliver more poise and grace. The Challenge Edition refines the Touring package with more racing technology for the road.
All that the STaSIS’ engineers have learned at the racetrack has been integrated into an S4 upgrade package that’s also been specified to be civilized for town driving. From concept to production, each new STaSIS component is meticulously tested to ensure maximum performance and factory levels of reliability.
The STaSIS Signature S4 packages are available with prices starting at GBP12,500 including 20 percent VAT and installation. Customers can also buy individual Audi S4 STaSIS Signature series components from APS of Brackley on a piecemeal basis. Prices are available upon request.
These packages feature a motorsport-derived STaSIS braking system that employs lightweight, two-piece 370-mm rotors and calipers. The rotors – which could also be availed in optional 390 mm – have large air gaps, a custom iron alloy and directional aerofoils -- all helping to remove heat generated during braking as fast as possible. These rotors -- bolted to an aluminum hat through a floating pin design – could endure a series of stops without succumbing to overheating or warping.
In lieu of the factory two-piece sliding calipers are six-piston monobloc aluminum calipers, which are around half as light. The pistons feature high-resilience seals for quick activation and retraction, allowing for a more linear response every time the driver presses the pedal.
The race-derived STaSIS braking system also features high-performance brake pads and stainless steel lines. Interestingly, any increase in the brake temperature would not affect the initial bite delivered when the brake pedal is stepped on – cutting off any worries of a driver when turning. Since each front wheel is now nearly 13 pounds lighter, it is now easier to steer the vehicle without further burdening the suspension.
Meanwhile, the suspension system for the Signature Series S4 and S5 Cabriolet features lightweight motorsports-derived dampers as well as high rate springs with an uprated anti-roll bar kit. These dampers come with STaSIS double-digressive valving that allows racecar-like controls with superb ride comfort. With the latest Signature Series, STaSIS is able to prove that it is able to successfully blend aggressive stance, enhanced ride comfort and improved handling.