Porsche 718 Cayman GT4 Clubsport MR 2019 User manual

Porsche 718 Cayman GT4 Clubsport MR & Trophy (2019)
Technical manual
Version V1, 08/2019

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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 possibility to look up data, settings and operating regu-
lations and also to facilitate the maintenance of the car.
It should be clearly pointed, that this manual should only make the operation of your Cay-
man GT4 Clubsport MR SRO-GT4) easier. It does not replace the separate installation guide
and the technical documents of the Porsche AG for the 718 Cayman GT4 Clubsport.
We wish you much success with your 718 Cayman GT4 Clubsport MR.
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 718 Cayman GT4 Clubsport should be sensitized for 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.
No proper 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/de/motorsport/downloads
and there be viewed and downloaded.
This technical manual contains information specic to the 718 Cayman GT4 Clubsport MR.
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 718 Cayman GT4 Clubsport 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 CAUSED
BY FAILURE TO FOLLOW.
WARNING AGAINST DEATH OR SERIOUS BODILY INJURIES
WHICH WILL OCCUR IN CASE OF NON-COMPLIANCE.
WARNING SLIGHT BODILY INJURY POSSIBLE IF NOT OBSER-
VED.
WARNING OF PROPERTY DAMAGE IF NON-OBSERVANCE.
Includes action-supporting information to facilitate the
work process.
Species a tightening torque default [Nm]. Specied
tightening torques must be adhered to.

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Content
1ENGINE 7
1.1 Maintenance interval 8
1.2 Air intake grid 9
1.3 Connection of the pressure sensor SRO-GT4 10
2CHASSIS 11
2.1 Maintenance interval 12
2.3 Spring assemblies SRO-GT4 13
2.4 Decommissioning low-speed adjuster SRO-GT4 14
2.5 Spring assemblies Trophy 15
2.6 Wheels and mounting (BBS rim) SRO-GT4 16
3BODY EXTERIOR 18
3.1 Maintenance interval 19
3.2 Air Jack System 20
3.3 Attachment parts (Bodywork) 26
3.4 Refueling SRO-GT4 39
3.5 Refueling Trophy 42
3.6 Polycarbonate windscreen 45
3.7 Holder rear wing SRO-GT4 46
3.8 Reference point height measurement SRO-GT4 47
4BODY INTERIOR 48
4.1 Maintenance interval 49
4.3 Safety foam driver's door 50
4.4 Safety net 51
5ELECTRICS 53
5.1 Maintenance interval 54
5.2 Xenon Headlight 55
6CONTACTS 56

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1 Engine
1.1 Maintenance interval 8
1.2 Air intake grid 9
1.3 Connection pressure sensor 10

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ENGINE | Maintenance interval
1.1 Maintenance interval
Component Maintenance interval Maximum term Service instructions
Protective grid air inlets Before every session - Check for damage, free from foreign ob-
jects
Connection of vacuum sensor (SRO) Before every race event - Check for tightness and chang

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ENGINE | Air intake grid
1.2 Air intake grid
Pos. Bezeichnung / Description MA. Teile Nr. / Part no.
1Z-SCHWELLER LINKS
AS DOOR SILL LEFT 1MTH541663
1Z-SCHWELLER RECHTS
AS DOOR SILL RIGHT 1MTH541664
2GITTER LUFTANSAUGUNG LI.
GRID AIR INTAKE LEFT 1MTH541561
2GITTER LUFTANSAUGUNG RE.
GRID AIR INTAKE RIGHT 1MTH541562
NOTE
► Manthey-Racing has developed grids for the side air intakes in the sill covers to protect the engine
bay air inlets and to protect them from excessive contamination of the air lters by pickup.
► To attach the grid, the two sill covers must be dismantled. The mesh is fastened with two cable ties
each.
NOTE
NOTE
Air intakes blocked by pickup can cause a damage. Blocked air intakes
cause increased engine bay temperatures. This can lead to perfor-
mance losses.
Excessive dirty air lters can lead to performance losses.
The grids must be checked for contamination at each pit stop, and if
necessary, be cleaned.
NOTE The grids described here have a ow-optimized orientation of the
meshes.
For mounting the protective grids, please observe the installation in-
structions of Manthey-Racing GmbH.

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ENGINE | Connection pressure sensor SRO-GT4
Pos. Bezeichnung / Description MA. Teile Nr. / Part no.
1
ADAPTER UNTERDRUCKSENSOR
CONNECTION INTAKE AIR PRESSURE SENSOR 1MTH618535
1
For installation of the adapter, follow the installation instructions of
Manthey-Racing GmbH.
► In some racing series (e.g. SRO-GT4), the connection of an additional sensor is required to detect
the intake depression. Manthey-Racing provides such a connection to all vehicles delivered accord-
ing to SRO-GT4 regulations. The competitor is responsible for the installation compliant with the
regulations.
► It is expressly stated that the reference and the correct installation of the sensor must be made by
the competitor.
► For assembly, the intake manifold of the engine must be dismantled. Information on disassembly/
assembly of the intake manifold can be found in the corresponding repair manuals of Porsche AG.
NOTE
NOTE
The measuring outlet is equipped with an internal thread M10X1.
On delivery, this connection is provided with dummy plug M10X1 and
sealing ring.
For the correct functioning of the vehicle, the measuring outlet must
either be equipped with a sensor or be closed with the standard dum-
my plug and sealing ring. Non-observance leads to malfunction of the
vehicle.
NOTE Check the adapter for damage and tightness during regular mainte-
nance.
1.3 Connection pressure sensor

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2 CHASSIS
2.1 Maintenance interval 12
2.2 Spring assemblies SRO-GT4 13
2.3 Decommissioning low-speed adjuster SRO-GT4 14
2.4 Spring assemblies Trophy 15
2.5 Wheels and mounting (BBS rim) 16

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CHASSIS | Maintenance interval
Component Maintenance interval Maximum term Service instructions
Springs and intermediate rings Before every session - Check for damage, free from foreign ob-
jects
Decommissioning low-speed adjuster - - -
Wheel nut Before every session - Check for damage to the hexagon, ball
seat and thread, replace if necessary
BBS rim front/rear axle Before every session - Check for damage and deformation, re-
place if necessary
2.1Maintenance interval

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CHASSIS | Spring assemblies SRO-GT4
►The following spring packages are available for use in the SRO regulated racing series. Further spring
variants are not released.
2.2 Spring assemblies SRO-GT4
Front axle Rear axle
The following spring packages are available:
Spring combination standard: Spring FA 130N/mm (l=140mm) Part no. 9F2411105
Spring RA 150N/mm (l=170mm) Part no. 9F2511121
FA/RA in combination with Part no. 9813435378A
auxiliary spring(10/60/80)
Spring combination option: Spring FA 130N/mm (l=140mm) Part no. 9F2411105
(Identical part to spring combination standard)
combination auxiliary spring (10/60/80) Part no. MTH343538
Spring RA 130N/mm; (l-=170mm) Part no. MTH343561
combination auxiliary spring (10/60/80) Part no. MTH343538
NOTE If the optional RA springs are installed, the corresponding intermedi-
ate rings MTH343562 must also be used.
Further information about the suspension components can be found in
the technical manual of Porsche AG.
NOTE Term revisions and accident repairs can be handled by Manthey-
Racing GmbH.

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CHASSIS| Decommissioning low-speed adjuster SRO-GT4
► In SRO regulated racing series shock absorbers may have only a two-way adjustment (compression
and rebound phases). A cost-eective and re-installable version is available for the three-way adjust-
able competition damper. With the help of a sealable cap, the low-speed adjuster on the pressure box
is shut down and thus the regulation conformity for the SRO-GT4 series is realized.
►The advantage of this method is that the shock absorber can be retrotted again without much tech-
nical and nancial eort to a triple-adjustable damper.
2.3 Decommissioning low-speed adjuster SRO-GT4
NOTE The caps can be purchased from Manthey-Racing GmbH and can be-
self-attached. But the sealing required by the SRO only takes place at
Manthey-Racing or by an employee of the company Manthey-Racing
GmbH.
Pos. Bezeichnung / Description MA. Teile Nr. / Part no.
1STILLEGUNG 3FACH AUF 2FACH
DUMMY SUSPENSION 2MTH022990
Detailed assembly instructions can be downloaded from the download
area of the Manthey-Racing website.

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CHASSIS |Spring assemblies Trophy
► The following spring packages are available for use with the damper variant "Trackday" (xed damp-
er) . These are for the VLN Class Cup 3 and the Creventic 24h Series. Further spring variants are not
released.
► Optionally the shock absorbers of the variant "Trackday" can be replaced by the shock absorbers of
the variant "Trophy Spec".
2.4 Spring assemblies Trophy
Front axle Rear axle
NOTE Spring combinations may only be completely installed as stated
above.
Standard spring combination (130 / 150N / mm) must not be com-
bined with spring combination option (110 / 120N / mm).
The following spring packages are available:
Spring combination standard: Spring FA 130N/mm (l=140mm) Part no. 9F2411105
Spring RA 150N/mm (l=170mm) Part no. 9F2511121
FA/RA in combination with Part no. 9813435378A
auxiliary spring(10/60/80)
Spring combination option: Spring FA 110N/mm (l=140mm) Part no. MTH343533
combination auxiliary spring (10/60/80) Part no. MTH343538
Spring RA 120N/mm; (l-=170mm) Part no. MTH333533A
combination auxiliary spring (3/60/80) Part no. MTH343537A
Further information about the suspension components can be found in
the technical manual of Porsche AG.
NOTE Term revisions and accident repairs can be handled by Manthey-
Racing GmbH.

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CHASSIS | BBS Wheel & mounting SRO-GT4
Pos. Bezeichnung / Description MA. Teile Nr. / Part no.
1BBS FELGE VA 9x18 ET41 SCHWARZ
BBS WHEEL FA 9x18 ET41 BLACK
2MTH601810
1BBS FELGE HA 10,35x18 ET47,5 SCHWARZ
BBS WHEEL RA 10.35x18 ET47,5 BLACK
2MTH601820
3RADMUTTER
WHEEL NUT
20 MTH601800H
4BBS NABENDECKEL Ø 76,5
HUB COVER BBS Ø 76,5
4MTH601816
5VENTIL
VALVE
49F2601361
6RDK SENSOR
TPM SENSOR
49F0907275A
7HALTER RDK SENSOR
BRACKET TPM SENSOR
49F0907455A
► For the 718 Cayman GT4 Clubsport MR the specied BBS wheel MTH 601810 (FA) and
MTH601820 (RA) is mandatory when participating in a SRO regulated racing series. Other wheels
are not homologated or released.
► Compared to the standard rim of the 718 Cayman GT4 Clubsport, the weight per rim was reduced
by about 1.5 kilograms.
Never tighten the wheel nuts with a higher tightening torque than
described here. Wheel bolts and rims can be damaged. A failure of the
components during driving can be the result.
WARNING
DANGER To attach the MTH601810 and MTH601820 rims, only use the speci-
ed wheel nuts with part number MTH601800H.
Always keep the ball collar of the wheel nut and the ball seat on the
rim free of dirt. There must be no lubricants or other friction-aecting
substances at these contact surfaces. Falsied tightening torque! The
screw connection could dissolve.
WARNING
WARNING The wheels must be checked at regular intervals in the course of vehi-
cle maintenance for damage. If damage is detected (deformation,
crack or circumferential notch in the rim bed, for example due to a
jammed stone between the brake caliper and the rim), the rim must be
replaced.
A repair is not allowed!
140 Nm
2.5 Wheels and mounting (BBS rim)

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NOTE
CHASSIS | BBS wheel & mounting SRO-GT4
Pos. Bezeichnung / Description MA. Teile Nr. / Part no.
1BBS FELGE VA 9x18 ET41 SCHWARZ
BBS WHEEL FA 9x18 ET41 BLACK
2MTH601810
1BBS FELGE HA 10,35x18 ET47,5 SCHWARZ
BBS WHEEL RA 10.35x18 ET47,5 BLACK
2MTH601820
3RADMUTTER
WHEEL NUT
20 MTH601800H
4BBS NABENDECKEL Ø 76,5
HUB COVER BBS Ø 76,5
4MTH601816
5VENTIL
VALVE
49F2601361
6RDK SENSOR
TPM SENSOR
49F0907275A
7HALTER RDK SENSOR
BRACKET TPM SENSOR
49F0907455A
► The wheels are suitable for mounting the standard RDK sensors of the 718 Cayman GT4 Clubsport.
Only RDK sensors approved by Porsche AG, including heat protection,
may be installed. For aermarket products, there is a risk that they
will not be recognized by the RDK-Systems or that they will deliver
falsied air pressure values.
Only use the valves approved according to the parts catalog and tech-
nical manual of Porsche AG.
To clean the rims, only use mild detergents (acid-free).
Ignoring could damage the coat.
ATTENTION
NOTE

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3 BODY EXTERIOR
3.1 Maintenance interval 19
3.2 Air Jack System 20
3.3 Attachment parts (bodywork) 26
3.4 Refueling SRO-GT4 39
3.5 Refueling Trophy 42
3.6 Polycarbonate windscreen 45
3.7 Bracket rear wing SRO-GT4 46
3.8 Reference point height measurement SRO-GT4 47

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BODY EXTERIOR |Maintenance interval
3.1 Maintenance interval
Component Maintenance interval Maximum term Service instructions
Air Jack System Before every race event -
Check for leaks and damage to lines and
liing plugs.
Check that the liing stamps are rmly
seated in the body receptacles.
Liing cylinder 2.000 strokes / 2 years -
Revision of the liing cylinder by the
manufacturer.
For every vehicle maintenance, check the
stamp for damage and maintain with sili-
cone spray
Air intake grid front covering Before every session - Check for dirt.
Replace damaged air intake grid
Air-Curtain openings front covering Before every session - Check for contamination and eliminate if
necessary
Lock pins Before every session - Check for tightness and damage and re-
place if necessary
Heat protection foil rear cover and dius-
er Before the event or aer accident - Check for damage and repair if necessary
Aerocatch closures and retaining tabs of
the engine cover Before every session - Check for damage and/or wear and re- place if necessary
Complete fuel system incl. fuel tower Before every session -
Check for tightness and wear incl. fuel
can. Check the three-ap valve for proper
function
Rear wing bracket Before every session - Check for tightness and damage (e.g.
cracks, replace if necessary)

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BODY EXTERIOR | Air Jack System
3.2 Air Jack System
High risk of injury! The rear air liing plugs are located directly on the
edge of the vehicle. The li operator must perform an environment
check before operating the system. There must not be any persons in
the danger zone. All persons entrusted with work on the vehicle must
receive a safety instruction on how to use the air liing system.
WARNING
Never work under the vehicle lied by the air liing system without
securing it against unintentional release. The securing must always
be done with the airli supports included in the delivery.
WARNING
To prevent damage to the end stops of the li stamps, never extend
the air li with full working pressure (without vehicle load).
ATTENTION
► The vehicle variant "Competition" is delivered as standard with an air jack system. The correspond-
ing aerial li supports and the air lance are enclosed with the vehicle. A suitable compressed air cyl-
inder including trolley is available as an option.
The vehicle variant "Trackday" can be equipped with an air jack system on request.
ATTENTION Never open the air liing plugs! Because of the system, the liing
plugs are under pressure even when retracted. If a liing plug is
opened, a revision by the manufacturer is necessary.
ATTENTION Never exceed the maximum permitted system pressure of 35 bar.
Lines, connections and liing plug can be damaged.