Hiermal für alle die Definition der Gruppe A und Gruppe N Abgasnalagen nach dem gültigen Reglement der FIA:
Gruppe N:
- Exhaust :
It will be possible either to remove the inside of the original silencer, or to modify the exhaust from the first silencer to the exit, the maximum external diameter of the duct being that of the pipe situated upstream of the first silencer (see Drawing 254-3 and Article 328p of the Group N Homologation Form).
If the original pipe upstream of the first silencer is a twin pipe, the maximum external diameter of the new duct must correspond to a section identical to that of the two pipes.
For cars fitted with a turbocharger, it will be possible to modify the exhaust from the turbocharger outlet mounting plate, the maximum section of the duct being the diameter of the inlet into the first standard silencer. The interface between the turbocharger outlet mounting plate and the exhaust duct may be conical.
Should two inlets exist in the first silencer, the section of the modified duct must be less than or equal to the total of the two original sections.
Only one pipe may be present at the exit, unless the original part is used.
The exit should be situated in the same position as that of the series production exhaust system.
These liberties must not entail any bodywork modifications and must respect the laws of the country in which the event is run with regard to noise levels.
Additional parts for the mounting of the exhaust are authorised.
A muffler is a section of the exhaust system that must reduce the exhaust noise level of the vehicle.
The cross section of the muffler must be at least 170% of that of the inlet pipe and contain sound deadening material.
The sound deadening material may take the form of a 45% perforated tube or synthetic packing.
The length of the muffler must be between 3 and 8 times the inlet diameter.
The muffler may be supplied as a series part welded to a pipe but the pipe is not considered as part of the muffler.
The catalytic converter is considered as a silencer and may be moved.
If it is fixed directly onto the manifold, the catalyst may be replaced with a conical part of the same length and with the same inlet and outlet diameters.
After this part, the exhaust will be free with a tube diameter no greater than that of the outlet from the catalyst.
If the catalytic converter is an integral part of the exhaust manifold, it is possible to remove only the internal part of the catalytic converter.
A Lambda probe may be removed only if it forms part of the free part of the exhaust pipe.
Gruppe A:
5.1.16) Exhaust:
Drawings III and IV on the Group A/B homologation form must be respected.
Downstream the exhaust manifold exit the exhaust is free provided that the maximum sound levels permitted in the country(ies) crossed are not exceeded if it is an event on open roads.
The exhaust exit must be inside the car's perimeter (see General Prescriptions, article 252-3.6).
For the WRC, an efficient heat shield must be put in place around the exhaust in order to avoid excessive exhaust heat and to channel possible leaks towards cooler areas of the car.
For cars with turbocharged engines the exhaust can only be modified after the turbocharger.
In the case of rotary engines, and on condition that the original dimensions of the inlet ports of the exhaust manifold are respected, the dimensions of the ducts in the manifold are free.
Thermal screens may be fitted on the exhaust manifold, the turbocharger and on the exhaust device, with, however, the sole function of thermal protection.
- Normally aspirated engines :
The gas flow must never be modified by means of electronic or mechanical controls.
- Supercharged engines :
The gas flow may only be modified through the operation of the waste-gate and/or the control for injecting fresh air into the exhaust manifold.
Für beide Gruppen gilt auch folgendes:
3.6 Exhaust system and silencer
Even when the specific provisions for a group allow the replacement of the original silencer, the cars competing in an open-road event shall always be equipped with an exhaust silencer complying with the traffic regulations of the country(ies) through which the event is run.
For all cars used in Rallies and unless the limits imposed by the local authorities are lower, the noise level on the open road mustnot exceed 103 dB(A) for an engine rotation speed of 3500 rpm for petrol engines and 2500 rpm for diesel engines.
The orifices of the exhaust pipes shall be placed at a maximum of 45 cm and a minimum of 10 cm from the ground.
The exit of the exhaust pipe must be situated within the perimeter of the car and less than 10 cm from this perimeter, and aft of the vertical plane passing through the centre of the wheelbase.
Moreover, adequate protection must be provided in order to prevent heated pipes from causing burns.
The exhaust system must not be provisional. Exhaust gas may only exit at the end of the system. Parts of the chassis must not be used to evacuate exhaust
gasses.
Catalytic exhausts: Should two possible versions of one car model be homologated (catalytic and other exhaust), the cars must comply with one or other version, any combination of the two versions being prohibited.
All cars equipped with a kit (VK) must be fitted with a homologated catalytic exhaust.
For all groups, all cars must be fitted with an original or homologated catalytic exhaust if this is obligatory in the country in which they are registered, unless the catalytic exhaust is not obligatory in the organising country, in which case it may be removed.
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Zitat von passi93
