Red Bull's route to preparing for 2016 was fraught with indecision over its power unit.
It is invariably a team that leaves a new car's completion until the last minute anyway, so expect the RB12 to change a great deal over the two weeks of testing.
The car has shown some of its secrets so far, but there is also evidence that Red Bull is holding its final specification back to maximise development time and exploit all possible gains in the windtunnel.
The perfect Formula 1 car from 2016 Mercedes swept all before it again in 2016, but it was not the perfect car - take some bits from rival teams and you'd have quite the potent racer... F1
F1's new development war has already begun The last grand prix weekend before the winter offered teams a great opportunity to get a headstart on work for 2017 F1
F1 teams still pushing with an eye on 2017 The F1 development race hasn't slowed down as much as expected in the final races of the current rules cycle, with teams still pushing to maximise running before the winter break and Mexico-specific solutions on show this weekend too F1
A glimpse at McLaren's 2017 work at Austin? McLaren struggled at Suzuka, but on Friday at Austin it introduced developments to its MP4-31 that could well have next season in mind F1
How Tandy joined an exclusive club of endurance legends Victory at last year's Spa 24 Hours meant Nick Tandy had completed the unofficial sextuple crown of the world's six biggest endurance races, becoming the first Briton to do so. Ahead of his fresh start with Corvette Racing, he explains how he did it GT
The reluctant Lotus ace who was dropped for Clark A firm believer that motor racing was a sport for gentlemen, Innes Ireland lived a spirited life. NIGEL ROEBUCK recalls a character whose outlook ceased to fit with modern Formula 1 F1
The ground-up refresh behind Toyota's new Le Mans challenger Toyota's new GR010 contender for the World Endurance Championship's Hypercar era has little in common with the LMP1 TS050 that preceded it. But within the confines of the scaled back new rules, its latest challenger will be no less formidable a prospect WEC
What to look out for in the 2021 WRC As the 2021 World Rally Championship prepares to launch amid tight COVID-19 restrictions in Monte Carlo, here are the eight things unrelated to the pandemic that you should keep an eye on this year WRC
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