Specifications

GROUP N GUIDELINES
A Group N car is fundamentally a standard
production car fitted with obligatory additional
safety items such as a roll cage, safety harnesses
and plumbed-in fire extinguishers, to comply
with specific FIA Regulations for Touring Cars -
Group N. In addition you will have to carry out
some further permitted modifications to make
the car more competitive.
Starting with the engine, not a great deal can
be done to a normally aspirated engine under
Group N regulations apart from blueprinting,
which is not cost effective.The basic engine
design and component finish is to such a high
standard that the need for excessive individual
component preparation is minimal. However,
there is some scope for a power increase as a
result of re-programming the ignition and fuel
electronic control units, and these modified
components are now generally available on the
aftermarket.
Suspension modifications are permitted, in
that the springs and shock absorbers may be
replaced with uprated units, but their working
principle and attachment points must remain
unchanged. The ride height of the vehicle must
conform to the homologated dimensions.
Flexible bushes at the suspension pivot points
may be changed for mechanically similar bushes,
but made from a harder compound.
The dimensions of the brakes must remain as
normal production specification for the model
but the pad/lining material can be changed. The
handbrake may be converted to 'fly-off' action
and aviation type brake lines are permitted, but
no form of brake balance adjustment is allowed.
The exhaust system can be modified from the
first silencer box to the exit, provided that the
pipe size does not exceed that forward of the first
silencer box.
BODYSHELL
The reinforcement procedures and the body
strengthening components featured in the Group
A Kit, outlined earlier in this manual for the
Group A car can be followed, as seam welding
and strengthening of the suspended part is
allowed under Group N regulations. Please note
that the carpet and gearlever gaiter supports
referred to in that section CANNOT be
removed. The seat mounting system can be
modified to accept seats from a different source,
but the alternative seats must have at least the
same MINIMUM weight as the original seats.
This can be achieved by ballasting if necessary.
Ballast must be securely attached to the
replacement seats for both safety and eligibility
reasons. All the interior trim must be fitted to the
car, including the rear seats, although they may
not necessarily function as a seat once the roll
cage is installed!
ROLL CAGE
The Group A Clubman Kit safety roll cage can
be fitted, and holes through the trim panels can
be made if necessary to enable this component to
be attached. The section in this manual
specifically outline the fitting procedure for the
Group A car, but applies equally for a Group N
installation.
A front suspension brace is permitted
between the suspension mounting points on
condition that it is fixed exclusively by bolts on
to the suspension mounting points.
ELECTRICAL
This section of the manual applies equally to
Group N preparation. Brakes, transmission,
exhaust, suspension and engine preparation
chapters are exclusively for the Group A car and
have no compatibility with the requirements of
Group N.
GM Eurosport do not have any specific
components for the Group N car, although
certain components from the Group A Clubmans
Kit can be used. These are restricted to the
following parts:
Body Strengthening Kit
Fuel tank Guard
Strut brace (tube), Strutbrace brackets LH/RH
Roll cage assembly
Rear beam bushes
Rear road springs
Rear shock absorbers
Engine mounting rubbers (set of 3)