The rear diffuser design rules have been rewritten

The FIA has clarified the rules governing the the dimensions of the rear diffuser design, following allegations that McLaren and Mercedes GP – plus two other teams – had incorporated much larger slot gaps than necessary in the rear of their cars to accommodate for their starter motors.

About time!

Such a slot gap in the diffuser creates another hole for air to pass through, which produces more downforce and ensure that the downforce is more consistent over the lap.

The FIA has now issued a written directive to all teams, outlining the strict dimensions for the maximum diameter of these slot gaps, but also the maximum projected area allowed for the design.

In addition to McLaren and Mercedes GP, two other teams – believed to by Force India and Renault – will have to modify their diffuser designs prior to the Australian GP next weekend.

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Richard Bailey

Founder & Chief Editor at MotorsportM8
Hasn't missed a Grand Prix since 1989. Has a soft spot for Minardi. Tattooed with 35+ Grand Prix circuits.