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1999 GT3 R specifications
Porsche 911 GT3 R prototype
not much is known about the specifics of what was inside the engine but the two prototype cars had one-off motors, made up of 962 based engine parts, the early GT3 R cars had a 964 engine case, some of which just had freeze plugs in the oil return tube holes. The parts in the production GT3 R 3.6 engines were sand cast, unlike these, and continued to use the 996 GT3 engine as its base.
3.2 liter based on Porsche 956/959/962/GT1
maximum torque ?
maximum rpm ?
water cooled with oil heat exchanger
intake system with six throttle valves
Bosch (?) fuel injection with detonation control
exhaust manifold open, without catalytic converter
six speed manual transmission type
? (think it was 993 GT2) cable controlled gear shift mechanism ?
rear wheel drive
single mass flywheel with racing clutch
limited slip differential -- 40/65%
gear ratios (as delivered)
ring and pinion ?
- unsure of exact ratios
revised 996 chassis with front and
rear composite fender flares
composite front nose, front fenders, front and rear hood, doors, rear tail and rear lid
aerodynamically optimized front nose and rear tail
welded-in safety roll cage
racing bucket seat (driver only)
six-point seat belt/harness
MOMO steering wheel
100 liter FT 3 safety fuel cell
plastic door, side and rear windows
electrically actuated power steering
McPherson front suspension with ball joints
multilink rear axle with ball joints
coil spring with adjustable ride height and rate
Bilstein adjustable shock absorbers
front - ?
rear - ?
center lock hubs/wheels
front roll bar adjustable in five positions
rear roll bar adjustable in three positions
drive shafts with CV joints
twin pedal system with two master
cylinders and balance bar
internally vented brake discs
front - ? diameter
rear - ? diameter
Bosch (?) engine management
Stack display with integrated data recording (data recording device: optional)
lap trigger over Stack display
12V 50 Ah battery
alternator 110 amp
Approximately 1,100 kg (2442 lb.) per Le Mans Regulations
Color Exterior and interior
1999 Production Figure - 2 cars, prototypes