FUEL TANK VENT LINE
TYPE:
911 GT3 Cup (996 Cup) Car
Under
extreme high temperature racing conditions, the fuel tank vent line can soften
and, possibly, kink. The resultant restriction could cause elevated pressure in
the tank, which could lead to damage to the fuel system or risk of personal
injury as a result of contact with fuel.
To
ensure proper ventilation of the fuel tank, the following modification is
necessary:
CENTER LOCKING HUB
TYPE: 911 GT3 Cup (996 Cup) Car
When
installing a new wheel center locking hub (central screw), it is necessary to
follow the recommended procedure:
1.
Carefully clean all parts
2.
Lubricate all contact areas and threads with copper grease
3.
Tighten retaining nut to 470 Nm
4.
Install locking collar – if necessary, tighten
retaining nut additionally to allow engagement of the next
locking tab
5.
Install retaining snap ring
1999 Daytona 24 Hrs Preparation
Porsche
Motorsport suggests the following recommendations or modifications:
TYPE:
911 GT2
-
Engine (Double Ignition)
Check
that the waste gate actuators (mounted on the compressor housing) have two
green dots painted on the cover of the pressure chamber. If your actuators
don’t have these markings, replace them with the proper parts from the PMNA
truck.
-
TAG 3.8 Motronic Unit
Install
a water separator in the hose between the engine pressure chamber and the motronic
unit, so that NO moisture can enter the pressure sensor in the unit. Make sure
that the separator is rated for 50 lb. and higher. Water separators are
available from Porsche Motorsport (part # PMN 618 900 FS). Replacement elements
are also available (part # PMN 618 901 FS)
-Transmission
Replace
the differential housing with the current one from the GT1 transmission (part #
996 332 080 80). This housing is machined from billet, is a special material
and receives different heat treatment. The normal GT2 housing is a cast production part and,
in the past, there have been instances of cracking. The internal parts from the
GT2 housing can be installed in the new housing.
Install
differential shim package, part # 950 332 981 81 (moly coated) and pressure ramp,
part # 950 332 983 58, which provides 50/80% limited slip value.
We
recommend the following transmission oil:
Castrol XJ
Veedol SAF 44
Mobilube 1 SHC
Half Shafts
If you use the larger rear tires
(14"), the load on the outer joints increases dramatically. To alleviate
this situation, install cooling hoses directed at the joint, from the fan
outlet or from the bottom of the vehicle.
Do not lower the vehicle
excessively, since this will increase the axle angle and the load.
After every session and during
each pit stop, check that NO grease is leaking from the joint boot. If you find
grease, change the half shaft, or watch for potential problems later in the
race.
Rocker Arm Modification
Porsche Motorsport
suggest the following recommendations or modifications:
TYPE: 911 3.8 RSR & GT2
- Engine
1. When installing new
Rocker Arms into the eingine it is imperative that the
(3) GOLD left arms go int the 1, 2, & 3 exhaust positions.
2. The SILVER
left Rocker Arms are for all of the other positions.
3. DO
NOT, under any circumstances, install the SILVER
Rocker Arms in the 1, 2, & 3 positions.
Transmission G50
TYPE: 911 3.8 RSR & GT2
Porsche Motorsport
suggests the following recommendations or modifications:
If you overhaul the
transmission, make sure that you replace the shift rod only with the racing and
not the street version!
1 * 950 303 134 05 Shaft
1 * 900 302 028 01 Pin
BBS Pressure Shim
TYPE: 911
3.8 RSR & GT2
Several rupture damages
have occurred on the central wheel locking pressure discs of BBS Wheels. After
examining the damaged parts we found them to be NOT
original Porsche Motorsport Parts.
Porsche Motorsport suggests
the following recommendations or modifications:
Porsche Motorsport
definitely advises against the use of these reproduction parts. The differing
characteristics can be clearly recognized in the following drawings.
Rear Lower Control Arm Ball Joint
Assembly
TYPE: 911 3.8 RSR & GT2
There have been isolated
instances of failure of rear lower control arm ball joint assemblies under
racing conditions. Upon examination it has been determined that the failures
were the result of improperly assembled/tightened ball joints and retaining
nuts.
Porsche Motorsport
suggests the following procedure for assembly:
1. Careful visual inspection of ball joint tapered
surface for signs of wear. Surface must be smooth and free of signs of movement
within the wheel carrier.
2. Careful visual inspection of tapered ball joint socket in
wheel carrier.
3. Ball joints and wheel carriers showing signs
of wear must be replaced.
4. Mating surfaces in the wheel carrier and on the
ball joint taper must be grease free before assembly.
5. Assemble ball joint to control arm and torque nut
to 81 Nm (60 ft.lb.) while holding ball joint stud with T-40 Torx tool.
OIL TANK OVERFLOW
TYPE: 911 3.8 RSR
Some 3.8 RSR teams have
experienced excessive oil overflow from the engine oil tank under racing
conditions due to faulty breather line check valves.
Porsche Motorsport
suggests the following recommendations or modifications:
1. Remove the faulty check valve from the oil tank
vent line #39.
2. Install new vent line.
3. Connect the new line to the catch cannister.
4. Cannister must vent to atmosphere.