Porsche 911 GT3 Cup MR Gen. II User manual

Porsche 911 GT3 Cup MR Gen. II (Type 991.2)
Technical Manual
Version V2, 08/2020

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Contact
Manthey-Racing GmbH
Technical Support
Rudolf-Diesel-Str. 11-13
53520 Meuspath
Deutschland
Phone: [phone]
E-Mail: [e-mail]
Preface
This document should give you the ability to look up data, settings and operating regula-
tions and also to facilitate the maintenance of the car.
It should be clearly pointed, that this manual should only make the operation of your 911
GT3 Cup MR Gen.II (991.2) easier. It does not replace the separate installation guide and
the technical documents of the Porsche AG for the 911 GT3 Cup Gen.II (991.2)
We wish you much success with your 911 GT3 Cup MR Gen.II (991.2)
Your technical support of Manthey-Racing GmbH

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Proper use
This execution of the car is specially designed for the participation in competitions on circuits.
Repair work, maintenance work or adjustment tasks on a racecar need special skills and great
accuracy. The persons who work on a 911 GT3 Cup MR Gen.II (991.2) should be sensitized to
the special requirements of motorsports.
Illustrations, descriptions and schematics only serve as an example of the text.
We take no responsibility for the completeness and the conformity of our content with the
respectively applicable sporting codes and the valid legal regulations. Manthey-Racing GmbH
assumes no responsibility for the conformity with regulations.
Improper use
This car cannot be registered for the use on public roads and does not comply with the German
road trac regulation. (StVZO)
Further information
Caused by the constant optimization of our products, there are regular updates for this
technical manual. Please note that only the latest version of the technical manual is valid.
This can always be found in the download area of the Manthey-Racing GmbH homepage
under:
https://www.manthey-racing.de/en/motorsport/downloads
and there be viewed and downloaded.
This technical manual contains information specic to the 911 GT3 Cup MR Gen.II (991.2).
In addition to this technical manual, further information such as detailed installation and
operating instructions are available on the above-mentioned website.
Please always use this technical manual in conjunction with the technical documentation
for the Porsche 911 GT3 Cup Gen.II (991.2) from Porsche AG. Manuals, parts catalogs and
technical information (TI) for the basic vehicle can be viewed and downloaded at
https://motorsport.porsche.com.
Further information, such as detailed repair manuals are available in the Porsche Integrated
Workshop Information System (PIWIS). For that please contact your Porsche Partner. Alter-
natively, you can call up this information for a fee at the following Internet address:
https://techinfo2.porsche.com/PAGInfosystem/VFModuleManager?
Type=GVOLangSelection

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Warning and safety instructions
The classication of the warning or safety information is carried out by the respective signal
word (danger, warning, caution) next to the warning symbol.
To avoid personal injury and damage to the vehicle's operating or road safety or damage to
the vehicle as a result of improper work, these warnings and safety instructions must be
read carefully and followed without restriction.
For Manthey-Racing GmbH it is not possible to rate all dangerous situations in nal conse-
quence for the executing person. Repair, maintenance or adjustment work should only be
done by professional, trained mechanics . Attempting to perform repair or maintenance or
adjustment work without proper training, tools and equipment may result in death or injury
to yourself or others. In addition, there may be vehicle damage or malfunction of the correct
vehicle function.
It is therefore expressly pointed out that all work of the described work processes is only to
be carried out in compliance with the applicable directives and regulations of the locally
competent authorities, health, accident and environmental protection or in consideration of
the applicable legal provisions.
WARNING
ATTENTION
NOTE
DANGER
WARNING OF DEATH OR SERIOUS BODILY INJURY WHICH
CAN OCCUR THROUGH NON-COMPLIANCE
WARNING AGAINST DEATH OR SERIOUS BODILY INJURIES
WHICH WILL OCCUR IN CASE OF NON-COMPLIANCE.
WARNING OF MINOR BODILY INJURY POSSIBLE IF NOT OBSER-
VED.
WARNING OF PROPERTY DAMAGE IF NON-OBSERVANCE.
Includes action-supporting information to facilitate the
work process.
Required tightening torque specifaction [Nm]. Specied
tightening torques must be adhered to.

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1 Engine........................................................................ 7
1.1 Service Intervals................................................................................. 8
1.2 Engine Oil Quick Filler ....................................................................... 9
1.3 Central Radiator.................................................................................. 10
2 Gearbox..................................................................... 12
2.1 Service Intervals................................................................................. 13
2.2 Clutch Bleeding Line ......................................................................... 14
3 Exhaust System & Fuel System ........................... 15
3.1 Service Intervals................................................................................. 16
3.2 Exhaust Manifolds.............................................................................. 17
3.3 Porsche Motorsports Silencers....................................................... 18
3.4 Fuel System - Refuelling.................................................................. 19
3.5 Fuel System - Capacity Increase.................................................... 20
4 Suspension & Brakes.............................................. 21
4.1 Service Intervals................................................................................. 22
4.2 Suspension Struts/Shock Absorbers............................................ 24
4.3 Brake Cooling - Front Axle............................................................... 27
4.4 ABS M4................................................................................................. 28
4.5 Brake Lines - Rear Axle..................................................................... 31
4.6 Brake Lines - Quick Couplings........................................................ 32
4.7 Rear Axle - Suspensions Struts...................................................... 33
4.8 Rear Axle - Side Subframes............................................................. 35
4.9 Drive Sha Spacers ........................................................................... 36
4.10 Power Steering ................................................................................... 37
4.11 Rims....................................................................................................... 39
5 Body Exterior ........................................................... 41
5.1 Service Intervals ................................................................................. 42
5.2 Air Jack System .................................................................................. 44
5.3 Front Bumper ...................................................................................... 47
5.4 Front Impact Bar................................................................................. 48
5.5 Polycarbonate Windscreen.............................................................. 49
5.6 Fender ................................................................................................... 50
5.7 Trunk Lid............................................................................................... 51
5.8 Underbody Panelling ......................................................................... 52
5.9 Rear Bumper........................................................................................ 57
5.10 Engine Cover....................................................................................... 58
5.11 Rear Wing............................................................................................ 59
6 Electrics .................................................................... 61
6.1 Service Intervals ................................................................................. 62
6.2 Endurance Wiring Loom................................................................... 63
6.3 Xenon Headlights............................................................................... 75
6.4 Intelligent Colour Display (ICD) ...................................................... 76
6.5 Traction Control (TC) ........................................................................ 111
6.6 24H Lights........................................................................................... 112
7 Setups and Ride Height Measurement .............. 113
7.1 Delivery Setup - “GP track“.............................................................. 114
7.2 Delivery Setup - “Nordschleife“...................................................... 115
7.3 Ride Height Reference Points ......................................................... 116
Table of Contents

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1.1 Service Intervals ...................................................................... 8
1.2 Engine Oil Quick Filler ............................................................ 9
1.3 Central Radiator....................................................................... 10
1 Engine

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ENGINE | Service Intervals
1.1 Service Intervals
Part Service interval Max. runtime Service advice
Engine oil quick ller Before every session -
Check the lling hose in the engine com-
partment for rm seating and chafe
marks. Check the quick disconnect coup-
ling for cleanliness and damage.
Central radiator Before every session -
Check the central radiator for contamina-
tion. Check connections and fastening
points for damage and tight t. Check
water hoses including ventilation line for
chafe marks.

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ENGINE | Engine Oil Quick Filler
1.2 Engine Oil Quick Filler
NOTE
► The engine oil quick ller allows the engine oil to be relled while the engine cover is closed. Up to
1.0 litre of oil can be relled. The oil is pressed into the oil circuit with max. 2 bar in the lling bottle.
Drip-free lling is ensured via the quick disconnect coupling.
► Both the mounting bracket and the engine cover are equipped with a corresponding opening for
mounting.
The specied tightening torques must be observed. The vehicle opera-
tor must conrm with the organizer whether the opening in the engine
cover is permitted. Under certain circumstances, this can be inter-
preted as an irregular aerodynamic change.
Only ll with the quick disconnect coupling when the valve is clean.
Dirt ingress into the system must be avoided.
35 Nm
23 Nm
35 Nm
ATTENTION Never apply a higher pressure than specied to the system compo-
nents! The ller bottle, the lling line or engine components could be
damaged.
A corresponding ller bottle (oil stick) can be obtained from Manthey-
Racing GmbH.
NOTE In some racing series, closing the opening in the engine cover is not
permitted (aerodynamic masking). The vehicle operator / team is
responsible for compliance with the relevant regulations.

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ENGINE | Central Radiator
1.3 Central Radiator
NOTE
► A central water radiator is used on the 911 GT3 Cup MR Gen.II. The series- moderate water cooler
(3 pieces) are no longer installed. This means that the vehicle is better protected against radiator
damage when touched, even in close proximity battles on the race track.
► Like in the 911 GT3 Cup Gen.II, the cooling system is thermostat controlled. The blanking of the
The connectors and the ventilation line must be checked for correct
tting and chang points before each session.
Only coolant antifreeze approved by Porsche AG may be used. The
specied mixing ratio for the 911 GT3 Cup Gen.II has to be used.
10 Nm
10 Nm
10 Nm
10 Nm
NOTE The hose clamps for the connectors may only be used once. Never
retighten them! The specied tightening torque of 3 Nm must be ob-
served.
3 Nm
3 Nm
NOTE The four rubber brackets on the radiator holders must be checked for
damage before each event and replaced if necessary.
ATTENTION In the event of loss of coolant, all components of the cooling system
must be checked for damage. Checking tools (see technical manual
from Porsche AG) may have to be used. Failure to do so can damage
the engine due to overheating.
High water temperatures and high water pressure!
Risk of injury from burning.
Allow the system to cool down before starting work !
WARNING

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ENGINE| Central Radiator
Cooling System Schematic
GB_WT
Bank 1
Bank 2
Central radiator
KMAB
MO_WT
Water system short cut
Ventilation line
GB_WT ► Gearbox_heat exchanger
MO_WT ► Engine oil_heat exchanger
KMAB ► Water reservoir

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2.1 Service Intervals ...................................................................... 13
2.2 Clutch Bleeding Line ............................................................. 14
2 Gearbox

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ENGINE | Service Intervals
2.1 Service Intervals
Part Service interval Max. runtime Service advice
Bleeding the clutch Before each session -
Bleed the clutch before each session.
Check the line for rm seating and chafe
marks.

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ENGINE | Clutch Bleeding Line
2.2 Clutch Bleeding Line
NOTE
► With the optionally available upward vent coupling, the hydraulic clutch mechanism can be bled
without disassembly of the underbody.
► To allow fast removal of the gearbox, the ventilation line has a drip-proof quick disconnect coup-
The specied tightening torques for the quick disconnect coupling and
the bleeder must be observed.
The ventilation line can only be installed in the vehicle when the drive
train is removed.
14 Nm
14 Nm
14 Nm
NOTE The abrasion protection included in the scope of delivery must be in-
stalled in the area of the water pipe around the ventilation line. Failure
to observe this may cause damage to the ventilation line. A failure of
the clutch system is possible!
NOTE The components of the clutch ventilation must be checked for rm
seating and chang before each use. In the event of leaks, the relevant
components must be replaced.
NOTE If the quick disconnect coupling is unlocked, the two coupling parts
must be checked for dirt and damage before reconnecting
(connecting) the coupling. The proper latching of the coupling must be
ensured.
ATTENTION Never disconnect the clutch bleeding line under load (clutch depres-
sed). This may damage the quick disconnect coupling.
ATTENTION Personal protective equipment must be worn when bleeding the coup-
ling. Dispose of used hydraulic uid in accordance with regulations.
14 Nm

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3.1 Service Intervals ...................................................................... 16
3.2 Exhaust Manifolds .................................................................. 17
3.3 Porsche Motorsports Silencers .......................................... 18
3.4 Fuel System - Refuelling....................................................... 19
3.5 Fuel system - Capacity increase ....................................... 20
3 Exhaust System & Fuel System

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EXHAUST SYSTEM & FUEL SYSTEM | Service Intervals
3.1 Service Intervals
Part Service intervals Max. runtime Service advice
Exhaust manifolds Before every session 50 hours
Check the exhaust manifold and heat
protection for damage before each sessi-
on. If the side silencers available from
Porsche Motorsport are driven, they must
be checked for damage and full functio-
nality. No pickup may accumulate on
parts of the exhaust system.

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EXHAUST SYSTEM & FUEL SYTEM | Exhaust Manifolds
3.2 Exhaust Manifolds
NOTE
► The exhaust manifolds of the 911 GT3 Cup MR Gen.II correspond to the standard exhaust ma-
nifolds. Due to the closed underbody on the 911 GT3 Cup MR Gen.II, cool air can no longer ow
around the exhaust manifold. In order to protect surrounding components from excessive heat ra-
diation / heat transfer, the exhaust manifolds have been equipped with a special heat protection
insulation.
Only exhaust manifolds with heat protection insulation may be driven
with. Failure to observe this may damage surrounding components
due to the eects of heat. Risk of re!
Only new exhaust manifolds can be provided with the heat protection
insulation. New exhaust manifolds with heat protection must be obtai-
ned from Manthey-Racing GmbH.
35 Nm
WARNING
The heat protection insulation must be checked for damage before
each session. Rubber parts (pickup) must not accumulate on the ex-
haust manifolds. Risk of re!
WARNING
The brackets including clamps of the 911 GT3 Cup MY 2016 must
NOT be installed. This could damage the heat protection insulation.
NOTE The specied tightening torque for the M8 fastening nuts for connec-
ting the manifold to the engine block must be observed. The metal
seals between the manifold and the engine block must be replaced
aer each disassembly.
NOTE The maximum runtime of the exhaust manifold described in the 911
GT3 Cup Gen.II manual remains unchanged.

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EXHAUST SYSTEM & FUEL SYSTEM | Silencers
3.3 Porsche Motorsport Silencers
NOTE
► For events with strict noise requirements, the side silencers available from Porsche Motorsport can
be installed.
All components of the optionally available side silencers must be in-
stalled. Failure to observe can lead to heat build-up in sensitive areas.
Risk of re!
Detailed installation instructions can be downloaded from the down-
load area of the Manthey Racing website.
WARNING
The components of the side silencers must be checked for damage
before each session. Rubber parts (pickup) must not accumulate on
the components. Risk of re!
WARNING
The side brackets 9F0813651B and 9F0813652B must be cut on the
line shown opposite.
The side brackets are not part of the "front silencer" scope of delivery.
NOTE Please note that all parts described in the technical manual of the 911
GT3 Cup Gen.II must be installed for the assembly of the side
silencers.

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EXHAUST SYSTEM & FUEL SYSTEM | Fuel System
3.4 Fuel System - Refuelling
► The 911 GT3 Cup MR Gen.II is refuelled with the front cover closed. The standard top plate is ex-
panded with a tank tower and a three-ap safety lock. An additional rollover valve with increased air
ow is installed in the top plate in order to ensure quick and complete refuelling in all conditions. As
a result, the tank is vented quickly even during extreme conditions.
► The three-ap safety lock is self-sealing and does not require an additional fuel cap.
► Refuelling can be carried out using a fuel nozzle or suitable tank cans with a hose attachment.
3,5 Nm
20 Nm
NOTE
Fireproof clothing is strongly recommended for all work on the fuel
system (including refueling and defueling). Failure to observe can
result in serious injuries! Suitable re extinguishers must be provided
for all work on the fuel system!
Please respect the information and technical information for the fuel
system in the manual for the 911GT3 Cup Gen.II provided by Porsche
Motorsport.
The fuel system, including the tank tower and its components, must
be checked for damage and leaks as part of vehicle maintenance.
Failure to do so can result in serious injury.
WARNING
ATTENTION
DANGER
Modications to the three-ap safety lock are not permitted.
WARNING
Never refuel the vehicle with the engine running!
Always insert the nozzle into the three-ap safety lock as deep as
possible!
WARNING

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EXHAUST SYSTEM & FUEL SYSTEM | Fuel System
3.5 Fuel system - Capacity Increase
► The refuelling system (page 19) can be increased with the optionally available capacity enlarge-
ment ring by approx. 2.5 liters. With this volume increase, an approx. 5 cm high intermediate ring
with longer fastening screws is installed between the standard fuel tank and the top plate. The me-
thod of refuelling using a three-ap safety valve is retained.
3,5 Nm
NOTE
Fireproof clothing is strongly recommended for all work on the fuel
system (including refueling and defueling). Failure to observe can
lead to serious injuries! Suitable re extinguishers must be provided
for all work on the fuel system!
The fuel system, including the tank tower and its components, must
be checked for damage and leaks as part of vehicle maintenance. Fai-
lure to do so can result in serious injury.
WARNING
ATTENTION
DANGER
Modications to the three-ap safety lock are not permitted.
WARNING
Never refuel the vehicle with the engine running!
Always insert the nozzle into the three-ap safety lock as deep as
possible!
WARNING
ATTENTION The additional at gasket may only be used once. If the top plate is
removed, this gasket must be replaced!
Please respect the information and technical information for the fuel
system in the manual for the 911GT3 Cup Gen.II provided by Porsche
Motorsport.