EU3: Porsche to debut '07 911 GT3 RSR at Spa

2007 PORSCHE 911 GT3 RSR TO DEBUT AT 24 HOURS OF SPA IN BELGIUM ATLANTA - July 25 - Rounding out the development program more than 18 months in the making, Porsche Motorsport will hand two brand new 2007 Porsche 911 GT3 RSR race cars - based on...

2007 PORSCHE 911 GT3 RSR TO DEBUT AT 24 HOURS OF SPA IN BELGIUM

ATLANTA - July 25 - Rounding out the development program more than 18 months in the making, Porsche Motorsport will hand two brand new 2007 Porsche 911 GT3 RSR race cars - based on the 911 GT3 RS street car - to the Manthay Racing team from Germany to run the 24 Hours of Spa this weekend in Belgium.

The cars, to be driven by factory drivers Timo Bernhard and Marc Lieb from Germany, with Pedro Lamy from Portugal in one (car #111), and factory pilots Lucas Luhr (Monaco) and Sascha Maassen (Belgium) with Marcel Tiemann (Monaco) in the other car (#197), will run in a special class on Saturday, July 29, as a final test before being offered for sale to Porsche racing customers around the world.

More than 250 of GT3-R family of 911 race cars have been sold around the world since the introduction of the 911 GT3 R in 1999, and the car has won hundreds of professional races and championships including the 24 Hours of Le Mans, FIA GT, the 24 Hours at Daytona, the 12 Hours of Sebring, and 53 class wins in the American Le Mans Series. In ALMS, the Porsche teams using the GT3 R/RS/RSR have won the championship six of the series' seven-year existence.

Porsche customers in the American Le Mans Series are expected to switch to this new model for the 2007 season, replacing the present GT3 RSR which has been raced since 2004.

For Porsche and Manthey Racing ,the race is regarded as an important test under race conditions and at the same time serves as an assessment of the vehicle's development position. For 2006, this race is the only event that is currently planned. For Spa, the car is entered in the Group 2 class where vehicles from the Belcar national championships are eligible to compete. In 2007, the 911 GT3 RSR will be available for customer racing and aims to continue the success streak of its predecessors. Porsche customer teams have earned class wins in Spa every year since the GT3 first competed there in 2001 - with an overall victory in 2003.

Based on the 911 GT3 RS, a particularly light and sporty derivative of the 911 GT3, the current GT3 RSR is designed to comply with the A.C.O (Automobile Club de l'Ouest), the FIA-GT and IMSA (International Motorsports Association) as well as VLN (Veedol Langstrecke Nurburgring) regulations. Porsche decided to build the new GT3 RSR after analyzing the relevant A.C.O. and FIA

regulations in a specification which allows a minimum weight of 1,225 kilograms (predecessor: 1,125 kgs) and permits the tire width to be increased by two inches to now 14 inches. Thirty-five kilograms of the required additional weight may be placed as ballast in the vehicle, resulting in a lower centre of gravity.

For the normally-aspirated Porsche engine, this specification allows a capacity of 3.8-litres with two 30.3 millimetre air restrictors (predecessor: 3.6-litres, 29 mm diameter). The increase in displacement was achieved through the enlargement of the bore to 102.7 millimetres with the unchanged stroke of 76.4 mm. With the mandatory air restrictors, the unit delivers 359 kW/485 hp at 8,500 revs per minute. Maximum torque increased to 435 Nm. Top engine speed is reached at 9,000 rpm. Thanks to the increase in capacity and the corresponding reprogramming of the electronics, the top performance as well as the response and driveability have further improved. The new positioning of the mid-front radiator and the use of side radiators - taken from the high performance Carrera GT sports car - contribute to the thermal health of the engine.

For the 24 hour race in Spa, the GT3 RSR features the proven sequential six-speed gearbox of its forerunner. The customer vehicles for 2007 will be delivered with a new sequential six-speed transmission featuring the gears of the RS Spyder which competes in the American Le Mans Series.

The body shell of the GT3 RSR with the welded-in safety cage is ten percent stiffer than its predecessor. Distinctive wheel arches widen the body by 50 millimetres on each side. The track is enlarged correspondingly; wheels and tyres of the maximum allowable dimension can be fitted.

The relocation of the supplementary oil tank (option), the power steering and the battery to the front improve the weight distribution. The front and rear lids, the front mudguards, the wider rear, the doors as well as the front and rear panelling and wing consist of carbon-fibre composite material. The rear and side windows are manufactured from light polycarbonate.

The newly-developed aerodynamic package improves the aerodynamic efficiency compared to the forerunner (type 996 GT3 RSR) by a total of around seven percent. Airflow to and from the radiators, the brakes and the engine were further optimized. In compliance with the FIA and A.C.O. regulations the new GT3 RSR features a flat underbody.

The suspension with Porsche-optimized struts at the front and the Porsche multi-link axle at the rear corresponds to the configuration of the standard car. The modified kinematics is set-up for the wider tyre footprint and for the lowest possible camber change in rebound and compression. The new ZF-Sachs shock absorbers feature the Through-Rod-System with considerably lower chamber pressure and hence less friction than conventional dampers. As a result they offer a significantly improved response characteristic. The position of the rear axle was optimised. The axle features a new anti-rollbar, an adjustable upper link and an optimized lower link.

The brake system features six-piston aluminium callipers and 35 millimetre thick brake discs measuring 380 mm in diameter at the front and 30 millimetre four-piston aluminium callipers with 355 mm diameter discs at the rear.

Over the 2006-07 winter, 35 units of the new racing sports car will initially be built.

-porsche-

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Series Blancpain Sprint
Drivers Marcel Tiemann , Lucas Luhr , Timo Bernhard , Marc Lieb