Formula One champions Renault reported good progress with their 2007 car on Friday and expected the first chassis to be ready by Christmas.
McLaren rookie Lewis Hamilton topped the test timesheets for the first time in his Formula One career on Thursday while Kimi Raikkonen made a surprise appearance with Ferrari at the Jerez circuit.
Sometimes a chance remark can change the course of history.
Briton Jenson Button will miss Formula One testing in Jerez this week to allow him more time to recover from a rib injury.
This time last year, the fledgling Super Aguri team did not know whether they had a place in Formula One.
Former world champion Mika Hakkinen was the slowest man on the track on Thursday in his first Formula One test for McLaren in more than five years.
Formula One tail-enders Super Aguri want teams to be forced to sideline one of their two race drivers in Friday practice at grand prix weekends next season.
The Toyota Formula One team have brought in another senior management figure in a push to win an elusive first grand prix.
Ford's Marcus Gronholm took charge of the season-ending British rally on Saturday after Norwegian rival Petter Solberg skidded into a ditch at the start of the second leg.