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Differential
All four-wheel drive rally cars have three separate differentials (or diffs for short). Purpose of an diff is to distribute engine power to the wheels, center diff distributing power between front and rear axles. Front and rear diffs distribute power between left and right wheels. Diffs can be active or passive, mechanical or electrical.
DNF
Acronym for 'Did not finish'.
DNS
Acronym for 'Did not start'.
Downforce
The downward force generated as air flows around a moving object, like car. More important in track racing but rally cars also use this effect to gain extra grip. During the Group B era some cars were held on the ground only with help of huge spoilers and wings.
Drag
Resistance to a movement generated by air to any object passing through it. Is relative to speed and coefficient of aerodynamic resistance of the object, known as cw.
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Differential from Subaru Impreza WRC2004. Power comes in from the front (black ring) and gets distributed to wheels from the sides (silvery rings).
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Rear-wing of Skoda Fabia WRC which generates considerable downforce
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