'Missile in the war on mediocrity'

'Missile in the war on mediocrity'

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Photos by -Autonet.ca
Joe Duarte
Published: 31 07 2006

There is a little company in Neckarsulm, Germany (near Stuttgart) that takes perfectly good Audi cars and makes them super.

quattro GmbH, Audi's performance affiliate, only builds one model at a time, and for 2007 it worked over the A4 to create the RS 4. It comes in sedan, wagon and convertible versions, but we only get the sedan.

The RS 4 takes its rightful place as the flagship of the A4 line, but Audi Canada's Product Planning Manager, Karsten Ruwoldt, points out that RS 4 is more than just a premium A4.

"It's really a SuperSport in an A4 body," he points out. "It has the same roof and front doors as the A4, and that's about it."

Many of the RS 4's technical achievements come from Audi's motorsports experience. Most notable is 420-hp high-revving 4.2-litre multi-valve V8 featuring Audi's direct gasoline injection (FSI) technology. The latest generation of Audi's quattro all-wheel drive system, now asymmetric with dynamic torque distribution and a self-locking Torsen (for TORque-SENsing) centre differential, insures all that power is put to the road as efficiently as possible. The system is set up with a bias toward the rear (40 percent of torque goes to the front, 60 to the rear) for a sporting flavour.

The result is Audi-reported acceleration to 100 km/h in just 4.8 seconds and 16.6 seconds to 200 km/h. Top speed is electronically set at 250 km/h.

We wonder if those times could be improved upon were the car to be offered with the latest version of Porsche's Tiptronic (sequentially-shiftable) automatic. Although the standard, and only, 6-speed manual is light to the touch and crisp in its precision, a computer program controlled through steering wheel paddles in the hand of a competent driver would do the trick much more easily. And it would probably make the car more accepted as an everyday commuter.

The RS-exclusive Dynamic Ride Control (DRC) significantly reduces both body roll and pitch by linking the shock dampers at diagonal wheels mechanically. As forces are applied to one of the wheels, fluid is displaced to the diagonally-linked wheel via a centrally located reservoir. For example, in a turn, the weight initially loads to the outside front wheel causing that damper to compress. The fluid is displaced to the inside rear wheel to keep it on the road and provide power. As the car powers out of the turn, weight is transferred to the outside rear loading up the damper at that corner. Fluid is then displaced to the inside front wheel in order to better maintain steering control. As with most Audi quattro systems, it performs seamlessly.

Further, Audi's Electronic Stability Program (ESP) has been tailored to intervene later and act for a shorter period of time in order to provide an added measure of safety while not detracting from the car's sporting intentions.

And because launch and performance are enhanced, Audi also wanted to insure braking could keep up. Large disc brakes at all four corners bring the RS 4 to a standstill controllably and quickly. Underfloor ducts help cool them off to greatly reduce fade.

It all combined to make a wonderful day for us at the wheel. And although it performed flawlessly on the sweeping country roads north of Toronto, we'll reserve judgement on the RS 4's everyday practicality when we've had a chance to try it on our established test route.

The dash is instantly recognizable as Audi, and there is the traditional row of buttons to control traction, suspension and comfort features. A sports button just above the radio (simply marked S) maps out a different program for throttle and fuel flow, giving the engine a sharper response and providing a throatier rumble during acceleration.

And since it is a premium sedan, the 2007 RS 4 comes standard with power sunroof, climate control, central locking via remote, parking assist and an in-dash CD changer. It starts at $94,200, with a $5,790 option package adding rain-sense wipers, Bose sound system, navigation system and Bluetooth connectivity, among others.

In addition to traction aids, safety items include dynamic adaptive headlights that follow the bends in the road via steering input, and front, front side-impact and full side-curtain airbags.

Awesome in its combination of performance and comfort, the RS 4 epitomizes Audi's unofficial philosophy that "if something can be made by man, it can be improved by man."

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