gridwalker wrote:Hi there, welcome to the forum!
If you look up the thread for the MP4/24, you will see that there are plenty of photos of the McLaren 2009 car running a 2008 spec wing.
Official test sessions do not require the car to be running the same aerodynamic formula as is specified for the season; many teams run apparatus for checking their car's aerodynamic performance that would be deemed illegal during a race session, so prohibiting teams from running items that could be deemed illegal would have a negative effect upon their ability to tune the cars.
I hope this answers your question!
I've been lurking on this forum for a while I'm ashamed to admit...Been using it as my source of info for the car launches since 2010, but only just got around to signing up...
Anyhoo, yup that does answer my question, thanks! I saw the pics this time last year of the teams, Mclaren in particular, running around with bits of what looked like a combine harvester plastered to their car. In that case I didn't know if that bit counted as part of the car, or whether it counted as something akin to the TV cameras - an attachment. I'd also seen the 2008-9 interim cars, with all the weird aero mixes, but I'd presumed that might've been special dispensation for the teams given the scope of the rule changes between those 2 seasons. They did run a lot of tests that winter if I remember correctly...