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LIST OF HOMOLOGATION
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List of FIA Homologation
About FIA Homologation form
Regulations, Definitions and Homologations of Group N
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About
FIA Homologation form
  
Appendix J to the FIA International Sporting Code
Art. 251- Classification and definitions, Excerpt from the Art. 2.1.8 (Jan. 2005)

All cars recognised by the FIA will be the subject of a descriptive form called homologation form
On which shall be entered all data enabling identification of the said model.
This homologation form defines the series as indicated by the manufacturer.
According to the group in which the competitors race, the modification limits allowed in international competition for the series are stated in Appendix J.
The presentation of the forms at scrutineering and/or at the start may be required by the organisers who will be entitled to refuse the participation of the entrant in the event in case of non-presentation.
With regard to Production Cars (Group N), apart from the specific form for this group, the Touring Cars (Group A) form must also be submitted.

On the homologation form which is defined as above there are every kinds of figures, and the real competition cars must exactly conform to these figures. For example, a bumper which differs according to the grade of the cars and is not homologated is not permitted to use even if it is a genuine part. In addition, an oversize piston for the engine may not be used as it does not conform to the figures on the form. The figures on the form are absolute. The conformity with the figures is the proof that the competition car is identical to the homologated car and the same can be said for its parts. This also provides the standard for the opinion of scrutineers. It must be duly noted that when the car enters in a competition as a Group N car it must also be homologated as a Group A car.
Classification of
FIA Homologation form  
Appendix J to the FIA International Sporting Code
Art. 251- Classification and definitions, Excerpt from the Art. 2.1.8 (Jan. 2005)

1. A basic form giving a description of the basic model.
2. A certain number of additional sheets describing "homologation extensions", which can be "variants", or "errata" or "evolutions".
Variants (VF, VP, VO, VK)
Supply variants (VF) (two suppliers providing the same part for the manufacturer and the client does not have the possibility of choice)
Production variants (VP) (supplied on request and available from dealers)
Option variants (VO) (supplied on specific request)
"kits" (VK) (supplied on specific request)
The competitor may use any variant or any part of a variant as he wishes, only on condition that all the technical data of the vehicle, so designed, conforms to that described on the homologation form applicable to the car, or expressly allowed by Appendix J. The combination of several VOs on the following parts is prohibited: Turbocharger, brakes and gearbox. For example, the fitting of a brake caliper as defined on a variant form is only possible if the dimensions of the brake linings, etc. obtained in this way, are indicated on a form applicable to the car in question. As far as kit-variants (VK) are concerned, they may not be used only under the conditions indicated by the manufacturer on the homologation form. This concerns in particular those groups of parts which must be considered as a whole by the competitor, and the specifications which are to be respected, if applicable.
Erratum (ER)
Replaces and cancels an incorrect piece of information previously supplied by the constructor on a form.
   
Evolution (ET, ES)
Characterises modifications made on a permanent basis to the basic model (complete cessation of the production of the car in its original form in the case of the evolution of the type (ET), or sporting evolution (ES) intended to render a model more competitive.
Evolution of the type (ET) - The car must comply with a given stage of evolution (independent of the date when it left the factory), and thus an evolution must be wholly applied or not at all. Besides, from the moment a competitor has chosen a particular evolution, all the previous evolutions should be applied, except where they are incompatible: for example, if two brake evolutions happen one after another, only that corresponding to the date of the stage of evolution of the car will be used.
Sporting evolution (ES) - Since the ES form refers to a previous extension, or to the basic form, the car must correspond to the stage of evolution corresponding to this reference ; moreover, the Sporting Evolution must be applied in full.

As there are several kinds of homologation forms issued and needed for one car, you are recommended to consult with "Group N Information" on this site beforehand as regards the forms you should obtain. Special attention should be paid that some forms have to be used in combination and that the homologation forms of Group A are required to be carried with a Group N car.