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Group 4 (racing) : ウィキペディア英語版
Group 4 (racing)

The Group 4 racing class referred to regulations for cars in sportscar racing, GT racing and rallying, as regulated by the FIA. The Group 4 class was replaced by Group B for the 1983 season.
==Production requirements==
Prior to 1966, the FIA’s Group 4 classification applied to Sports Cars which were in compliance with FIA Appendix C regulations. It also included recognised Series Touring Cars, Improved Touring Cars and Grand Touring Cars which had been modified beyond the respective Group 1, Group 2 or Group 3 regulations under which they had been homologated.〔(Article 252 of the FIA’s Appendix J regulations, 1962 ) Retrieved from www.fia.com on 11 February 2009〕〔(Article 252 of the FIA’s Appendix J regulations, 1965 ) Retrieved from www.fia.com on 11 February 2009〕 In 1966, an overhaul of FIA categories saw Group 4 Sports Cars redefined such that they were now subject to a minimum production requirement of 50 units in 12 consecutive months and had to be fitted with all equipment necessary for use on public roads. A 5000cc engine capacity limit was applied for 1968 and the minimum production requirement was reduced to 25 units for the 1969 season.〔M.L. Twite, The World's Racing Cars, 1971, page 109〕
For 1969, Appendix J of the FIA International Sporting Code defined groups for Touring cars, Grand Touring cars and Sports cars as follows: (numbers between brackets are required minimum production in 12 consecutive months).〔(Appendix J 1969, Art. 251, Art. 252 ) on (www.fia.com )〕
* Group 1: series-production touring cars (5,000)
* Group 2: special touring cars (1,000)
* Group 3: grand touring cars (500)
* Group 4: sports cars (25)
* Group 5: special touring cars
* Group 6: prototype-sports cars
For 1970, the limited production sports car category was renamed from Group 4 to Group 5 〔János L Wimpffen, Time and Two Seats, 1999, page 710〕 and, in the same year,〔M.L. Twite, The World's Racing Cars, 1971, page 99〕 Group 4 became the class for special grand touring cars with minimum production of 500 in 12 consecutive months 〔( Appendix J 1971, Art. 251, Art. 252 ) on (www.fia.com )〕
For 1971, the relevant FIA classifications were as follows:〔
* Group 1: series-production touring cars (5,000)
* Group 2: touring cars (1,000)
* Group 3: series-production grand touring cars (1,000)
* Group 4: special grand touring cars (500)
* Group 5: sports cars (25)
* Group 6: prototype-sports cars
In 1976, the Group 4 production requirement was reduced to 400 in 24 months.〔(Appendix J 1976, Art. 251, Art. 252 ) on (www.fia.com )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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