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Erik
May 14th, 2003, 19:14
Interesting information about the RS6 Competition below.
The next race is 05/18 Mosport (CDN) then:
05/26 Lime Rock (USA)
06/29 Road Atlanta (USA)
07/27 Sears Point (USA)
08/24 Road America (USA)
09/07 Laguna Seca (USA)
10/17 Road Atlanta (USA)
10/26 San Juan (PR)


With the Audi RS6, as successor to the successful S4 Competition, Champion Racing did not only break new technical ground: For the first time Dave Maraj’s team, with its headquarters in Pompano Beach (Florida), was also responsible for the development and construction of a completely new racecar.

“We started with an empty RS6 shell and made it into a race car – and that in no time at all. The first meetings with Audi concerning the RS6 project were held in May 2002,” remembers team owner Dave Maraj. Ten months later during the race debut of the production car based Audi RS6 at Sebring Randy Pobst managed to finish on the podium at the first attempt. “Champion Racing did a fantastic job,” praised Rod Bymaster, Audi North America’s Motorsport Manager. “On its debut, the RS6 was immediately competitive. We will solve the teething problems, normally associated with a new racecar, during the course of the season.”

The first two Audi RS6 Competition cars were built in Pompano Beach in less than 15 weeks. Champion Racing received project support from Audi Sport’s Customer Sport Department, the quattro GmbH and the Audi subsidiary Cosworth Technologies, who was responsible for the engine development.

Only a few operations were necessary to make the V8-biturbo engine, already with 460 hp in production trim, fit for racing. First of all the cooling was improved and the engine management correspondingly adapted. The RS6 4.2 litre V8 engine produces approximately 475 hp in race trim.

As the SPEED World Challenge is one of the few race series that admits four-wheel drive cars, the Audi drivers have no difficulties, despite the relatively narrow tyres specified in the regulations, to transfer the power to the road. “Thanks to the quattro transmission, traction and acceleration are a dream”, enthuses Randy Pobst. “We have things a little easier than our competitors, particularly at the start,” added defending champion Michael Galati.

The SCCA rule makers attempt to guarantee equipment and driver parity among the various car models, and compensate for the Audi S6 four wheel drive advantage with additional weight.

Almost 1400 kilograms must be accelerated and, more importantly, decelerated again. The Audi RS6 brakes are subjected to enormous loads. In order to cool them, 30 litres of water :eye: are carried on board that is sprayed on the brakes during competition.

Erik
May 14th, 2003, 19:14
Technical Data Audi RS6 Competition

Name: Audi RS6 Competition
Vehicle type: SPEED World Challenge GT car
Bodywork: Audi RS6 standard body shell, full seam welded and reinforced, alloy roll cage with integrated supension pickup reinforcements, carbon fibre doors and rear deck lid, Lexan front and rear windscreens
Aerodynamics: Carbon fibre front splitter, rear wing, flat undertray
Engine: V8 engine with alloy cylinder block, turbo charged, 90 degree cylinder angle, 5 valves per cylinder, 4 OHC, 2 turbo chargers, to comply with rules boost pressure limited to 2.0 bars
Engine management: Pectel T10S
Engine lubrication: Standard, Castrol lubricants
Displacement: 4172 ccm
Output: 475 hp (349 kW)
Torque: about 510 Nm at 6000 rpm
Transmission: permanent four-wheel drive quattro, torque split 40:60 front to rear
Clutch: 3 plate Tilton clutch
Gearbox: longitudinal 6-speed Audi transaxle gearbox
Differentials: Torsen differential front, viscous differential center, mechanical differential rear
Steering: Power steering
Suspension: Double-wishbone suspension front and rear, adjustable anti-rollbars front and rear, 5-way adjustable Öhlins dampers, Eibach competition coil springs
Brakes: eight-piston alloy brake calipers front, four-piston brake calipers (Brembo) rear, ventilated brake discs, full floating cast iron rotors front
Rims: Champion forged alloy wheels, Front and Rear: 9.5 x 18 inches
Tyres: Toyo, Front: 275/35/18, Rear: 275/35/18 (SCCA standard tyre)
Length: 4858 mm
Width: 1850 mm
Hight: 1425 mm
Wheel base: 2759 mm
Track: Front: 2750 mm, Rear: 2750 mm
Minimum weight: 1383 kgs (3050 lbs) :bigeyes:
Fuel tank capacity: 100 litres

JP4
May 15th, 2003, 05:12
Thanks for the posts Erik. There's a lot of info there that I and others have been waiting to see.

A 30 litre tank to spray the brakes with water!!!...Very interesting indeed. They obviously REALLY do have a cooling problem with those brakes.

Do you know if spraying the brakes with water is a commonly used method in that series?

Mr Balsen
May 18th, 2003, 18:15
I know this is heavily used in truck races in Europe. But I also understood that spraying water on hot discs brakes make the metal like crystal.

What is the real explanation ?

Mr Balsen

JP4
May 18th, 2003, 18:33
Originally posted by Mr Balsen
I know this is heavily used in truck races in Europe. But I also understood that spraying water on hot discs brakes make the metal like crystal.

What is the real explanation ?

Mr Balsen

Thanks for the response Mr. Balsen. I guess that since the rotors and pads are highly consumable items, especially in the track environment and will most likely be replaced between races, keeping them cool is more important in the short term.

Mr Balsen
May 18th, 2003, 18:51
But the discs don't break in pieces when the water is spray on them ?
Temperature difference is huge. No consequences during the whole race ?

or do they start to spray when they start to break ?

Mr Balsen

JP4
May 19th, 2003, 02:41
Originally posted by Mr Balsen
But the discs don't break in pieces when the water is spray on them ?
Temperature difference is huge. No consequences during the whole race ?

or do they start to spray when they start to break ?

Mr Balsen

Good questions...I don't have a clue! :confused: