hp @ 8500 rpm
lbs per hp
127.6 hp per liter
(from Porsche Press
Release) Porsche 911 GT3 RSR (997 type)
Based on the current 911 GT3 RS, a particularly light and sporty
derivative of the 911 GT3, the new GT3 RSR is designed to comply
with the A.C.O (Automobile Club de lOuest), the FIA-GT and IMSA
(International Motorsports Association) as well as VLN (Veedol
Langstrecke Nuerburgring) regulations. Porsche decided to build the
new GT3 RSR after analysing the 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 tyre width to be increased
by two inches to now 14 inches. 35 kilograms of the required
additional weight may be placed as ballast in the vehicle,
contributing to 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, two restrictors with 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 efficiency of the mid-front radiator was
increased while the radiators flanking the centre unit on each side
are the same as in the high performance Carrera GT.
The latest GT3 RSR features the proven sequential six-speed gearbox
with ignition cut of its forerunner.
The bodyshell 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 around
seven percent. Airflow to and from the radiators, the brakes and the
engine were further optimised. In compliance with the FIA and A.C.O.
regulations the new GT3 RSR features a flat underbody.
The suspension with Porsche-optimised struts at the front and the
Porsche multi-link axle at the rear corresponds to the configuration
of the standard car. The modified kinematics are set-up for the
wider tyre footprint and for the lowest possible camber change in
rebound and compression. The new ZFSachs 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 optimised 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 sportscar will
initially be built.