2009 - A New Era in F1
In its initial form, this component required a very specific driving technique to maximise the time on open throttle - which increased the downforce boost from the exhaust plume - and Webber was superb at it, consistently squeezing just that little bit more from it than his team-mate.
Vettel continued to be better at living with a little bit of entry oversteer, and that ability to adapt to the car moving around him was maybe partly why he was not as insistent on adapting his technique to a feature that calmed the rear end as soon as you got on the throttle.
From Valencia onwards however, the Renault engine was running software that retarded the ignition off-throttle, using the extra heat created to maintain exhaust flow to the diffuser even off-throttle.
While the stewards do not accept all the arguments of the team, they however conclude that as the regulation is written, the map presented does not breach the text of Art. 5.5.3 of the Formula One Technical Regulations and therefore decided to take no action.”