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A very valid question was raised during the Group 5 class last night: how are BMW M1s eligible, when to be homologated no fewer than 5,000 examples had to be built?
The answer is: the FIA changed the rule.
Group 5 looked like it was going to be the success story that the authorities had hoped for, with plenty of manufacturers happy to run cars that looked somewhat like their showroom product. However, the front-engined cars - in particular the BMWs - couldn't hope to compete with the Porsches and so they asked for dispensation to modify the platform. They were permitted to lower the car in front of the firewall by 10cm. The problem was that the rule had to be applied to all Group 5 cars including the Porsche 935, and everything in front of the engine firewall was... the whole car. So we arrived at the Porsche 935/78 Moby Dick.
BMW was somewhat aggrieved by this, and saw in the M1 an opportunity to settle some scores. So a Group 5 version was developed to kill Moby Dick using newly-written FIA provision for 'special production' cars with no minimum production volume.
So, yes, the M1 is a Group 5 car by the rules that existed in 1981.
The answer is: the FIA changed the rule.
Group 5 looked like it was going to be the success story that the authorities had hoped for, with plenty of manufacturers happy to run cars that looked somewhat like their showroom product. However, the front-engined cars - in particular the BMWs - couldn't hope to compete with the Porsches and so they asked for dispensation to modify the platform. They were permitted to lower the car in front of the firewall by 10cm. The problem was that the rule had to be applied to all Group 5 cars including the Porsche 935, and everything in front of the engine firewall was... the whole car. So we arrived at the Porsche 935/78 Moby Dick.
BMW was somewhat aggrieved by this, and saw in the M1 an opportunity to settle some scores. So a Group 5 version was developed to kill Moby Dick using newly-written FIA provision for 'special production' cars with no minimum production volume.
So, yes, the M1 is a Group 5 car by the rules that existed in 1981.