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Section C
Suspension
ATTENTION
HSV vehicles are equipped with a Supplemental Restraint System (SRS). An SRS consists of seat belt pre-
tensioners (fitted to all front seats), a driver’s-side air bag , a passenger’s-side air bag and left and right hand
side air bags. Refer to CAUTIONS, Section 12M Occupant Protection System in the MY 2005 VZ Coupe Series
Service Information before performing any service operation on or around SRS components, the steering
mechanism or wiring. Failure to follow the CAUTIONS could result in personal injury or unnecessary SRS
system repairs.
1 Purpose...................................................................................................................................................2
2 Front Suspension...................................................................................................................................3
2.1 General Information............................................................................................................................................... 3
2.2 Front Suspension Components............................................................................................................................ 4
Sports Suspension................................................................................................................................................ 4
Adjustable Performance Suspension................................................................................................................... 4
2.3 Service Operations ................................................................................................................................................ 5
2.4 Service Intervals..................................................................................................................................................... 6
3 Independent Rear Suspension .............................................................................................................7
3.1 General Information............................................................................................................................................... 7
3.2 Rear Suspension Components............................................................................................................................. 8
Sport Suspension.................................................................................................................................................. 8
Adjustable Performance Suspension................................................................................................................... 8
Rear Suspension Geometry.................................................................................................................................. 8
4 Rear Axle.................................................................................................................................................9
4.1 General Information............................................................................................................................................... 9
VZ GTO Coupe ....................................................................................................................................................... 9
4.2 Service Operations .............................................................................................................................................. 10
5 Limited Slip Differential.......................................................................................................................11
5.1 Precautions .......................................................................................................................................................... 11
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1 Purpose
The purpose of this section is to provide information on the front and rear suspension assemblies fitted to HSV VZ Coupe
models. The information is designed to supplement the information contained in the Holden VZ Coupe Service Manuals,
and details are given where differences occur between the HSV models and standard Holden models. A series of
instruction drawings describe the design changes and indicate specific part numbers, fitting instructions and relevant
notes for vehicle servicing.
NOTE
If specific technical data on a HSV model is not
contained in this supplement, obtain data for that
model from the relevant Holden VZ Coupe
Service Information Supplement. References are
made throughout this section to Holden Service
Manuals, to assist in providing information for
specific service operations.
When hoisting (or jacking) HSV models,
ensure that the liftin g head of the hoist lifts on
the chassis before the arm of the hoist
contacts the side-skirt
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2 Front Suspension
2.1 General Information
The front suspension assembly fitted to HSV VZ Coupe models is based on the Holden ‘MacPherson Strut’ design. T his
basic assembly (front and rear) is then modified by HSV to provide a suspension system more suited to the requirements
of the HSV vehicle. All GTO struts have Monroe Sensatrac with the exception of the optional Adjustable Performance
Suspension which uses an Ohlns based system.
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2.2 Front Suspension Components
The following components are fitted to front suspension assemblies as indicated:
Sports Suspension
03C-020601 Spring - Front Suspension
03F-030701 Strut Asm Frt - LH
03F-030702 Strut Asm Frt - RH
Adjustable Performance Suspension
03C-020601 Spring – Front Suspension
03F-030705 Strut Asm. Front – LH – Adjustable
03F-030706 Strut Asm. Front – RH – Adjustable
03A-040703 Top Plate – Outer
03A-040704 Ring - Retaining
11A-030701 Brace – Front Strut
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2.3 Service Operations
Service front suspension assemblies fitted to HSV models in accordance with the relevant Holden VZ Series Service
Information. Additional service requirements for specific HSV suspension assemblies are detailed in succeeding
paragraphs.
SAFETY AND CAUTIONARY NOTE FOR
VEHICLES EQUIPPED WITH ABS:
Whenever any component that forms a part of the ABS is disturbed, it is vital that the complete ABS system is checked.
Refer to Section 5B5 – ABS & ETC of the Holden VZ Series Service Information.
The tyre life of high performance low-profile tyres fitted to HSV VZ Coupe vehicles is very sensitive to the toe-in setting of
the front suspension. It is crucial therefore, that care is taken to set the toe-in accurately to the correct specification.
The front wheel alignment specification for HSV VZ Coupe Series vehicles is:
TOE-IN
Degrees Total 0°10' ± 0°10'
Degrees Per Wheel 0°05' ± 0°5'
Camber -0°30' ± 0°10'
Caster 7°45' ± 1°15'
The toe-in specification is deliberately quoted as an angle because wherever possible toe-in should be measured in
degrees.
A
REAR SUSPENSION HEIGHT
SIDE PANEL OUTER
SECT B
SECT A
FRONT SUSPENSION HEIGHT
SUSPENSION HEIGHT MEASUREMENTS IN mm
KERB WEIGHT = BASE WEIGHT + FULL TANK OF FUEL
MEASURE SUSPENSION HEIGHT FROM
UNDERSIDE OF WHEEL ARCH TO
LOWER POINT OF WHEEL RIM.
A
B
B
C
L
C
L
VEHICLE SUSPENSION HEIGHT AT KERB WEIGHT
MODEL
WHEEL SIZE
FRONT
REAR
VZ GTO COUPE
19’’ X 8’’
622 +/- 5
617 +/- 5
NOTE:
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3.2 Rear Suspension Components
The following components are fitted to rear suspension:
Sport Suspension
04E-030601 Shock Absorber – Rear
04F-010503 Bar – Rear Stabiliser (14 mm)
Adjustable Performance Suspension
04E-030704 Shock Absorber – Rear
04B-970702 Spring-Rear
Rear Suspension Geometry
Rear suspension geometry should be set within the limits specified:
TOE-IN
Degrees Total 0o20’ ± 0o5’
Degrees Per Wheel 0o10’ ± 0o5’
Camber -1o41’ to -0o25’ (0 o35’
Maximum)
Variation side-to-side 0o10’ maximum.
Positive degrees indicates toe in
Conditions for vehicle set-up are as specified for Holden VZ Coupe models. For HSV height information for the VZ Coupe
Series refer diagram in 2.3 Service Operations.
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4 Rear Axle
4.1 General Information
The HSV VZ Coupe model is equipped with a Limited Slip Differential.
VZ GTO Coupe
• Automatic transmission LS2 vehicles’ final drive ratio is 3.46:1
• Manual transmission LS2 vehicles’ final drive ration is 3.46:1
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4.2 Service Operations
Service rear axle assemblies fitted to HSV models in accordance with the relevant Holden VZ Series Service Information.
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5 Limited Slip Differential
5.1 Precautions
When servicing a vehicle fitted with a Limited
Slip Differential never run the engine with the
transmission in gear and one wheel raised.
The driving force to the wheel on the ground
may cause the vehicle to move.
NOTE
'On Car' type wheel balancers are not
recommended for use on the rear wheels of cars
equipped with a Limited Slip Differential. One
rear wheel will drive if in contact with the ground
when the opposite wheel is raised. This type of
balancer may be used by removing the wheel
opposite to the one being balanced with the
vehicle raised and supported on safety stands.
(Refit wheel nuts, reversed, to retain brake disc).