With the championship at a critical stage and far-reaching rule changes - affecting engines and chassis - dominating the teams' preparations for next year, this is a hectic time of the year for the engineering departments across the paddock.
With just four rounds remaining in the 2006 championship, the Turkish Grand Prix set the scene for the upcoming races, particularly at Suzuka and Interlagos.
And, with the points' battle tight throughout the standings, many teams introduced new parts in Istanbul, despite the recent test ban.
Istanbul Park provides stern test for car and driver alike. Running anticlockwise, the Tilke-designed circuit has a classic layout, with a fast straight capped by slow sequences, some faster sequences with several changes of direction, as well as the infamous Turn 8. This punishes the right front tyre and the driver's neck, as both the main straight and the back straight lead into heaving braking areas.