Editing Group B (section)

=== Specific regulations ===
Group B followed Article 252 and 253, which covered such things as [[Roll cage|safety cages]] or parts defining a car, like [[Windshield|windshields]] or [[Side-view mirror|side-view mirrors]].<ref name=":2" /> Article 256 covered regulations specific to Group B, with 5 paragraphs over half a page, and included most of the 7 pages of Article 255 for Group A. The first two paragraphs of 256 covered the definition of "(Sports) Grand Touring Cars" with a minimum of two seats, and their homologation requirements.

The section, "3) Fittings and Modifications Allowed" states, "All those allowed for Group A..." referring to the base rule set of what is allowed to be modified, how it can be modified, and what can be removed from the homologation road cars.
{| class="wikitable"
|+Group B engine capacity, weight, and tyre width limits, 1982<ref name=":5" />
!Maximum engine capacity (cc)
!Minimum weight (kg)
!Maximum tyre width (in)
|-
|1,000
|580
|8
|-
|1,300
|675
|8.5
|-
|1,600
|750
|9
|-
|2,000
|820
|10
|-
|2,500
|890
|11{{Efn|Maximum tyre width was not specified for 2,500 cc, with the 3,000 cc limit being applied instead.}}
|-
|3,000
|960
|11
|-
|4,000
|1,100
|12
|-
|5,000
|1,235
|13
|-
|>5,000
|1,300
|14
|}
If [[forced induction]] is present, restrictions apply as though the engine capacity is 1.4 times its actual value. If the engine is a [[Wankel engine|Wankel rotary]] or similar, then the capacity is considered to be "twice the volume determined between the maximum and minimum capacity of the combustion chamber." The equivalent capacity, <math display="inline">C</math>, for a [[Gas turbine|turbine engine]] is much more complicated, derived with the formula <math display="inline">C = \frac{S(( 3.10 \times T ) - 7.63) }{0.09625}</math> (1982) or <math display="inline">C = \frac{S( 3.10 \times R ) - 7.63}{0.09625}</math> (1986), where <math display="inline">S</math> is the "high pressure nozzle area" (cm<sup>2</sup>), and <math display="inline">T</math>/<math display="inline">R</math> is the "pressure ratio" of the compressor.<ref name=":2" /><ref name=":5" />