The full inside story of Senna's Indycar test This week marks the 25th anniversary of Ayrton Senna's 1992 Penske test in Arizona. To mark the occasion, here's an Autosport feature from earlier this year - the full story of the "amazing" occasion, told by the men who were there 1494979200 F1

The Indy 500 engine they had to outlaw Undefeated and never to be repeated. The story of how Penske's Ilmor-Mercedes engine for the 1994 Indy 500 went from top-secret evening project to dominating the Brickyard to banned 1483315200 IndyCar

The top 10 IndyCar drivers of 2016 Simon Pagenaud and Team Penske dominated the 2016 IndyCar season, but they were not the only drivers to impress over the course of a tough campaign 1474934400 IndyCar

Why is IndyCar shelving its manufacturer war? Competing IndyCar manufacturers Honda and Chevrolet will revert to only being engine suppliers in 2018, and aero kit development has been halted for next season. Why has the series removed an area of competition that was only recently adopted? 1474416000 IndyCar

Why Ogier's Citroen return is not a homecoming Sebastien Ogier is entering what he has already called the final act of his World Rally Championship career in familiar surroundings at Citroen. But things are set to be different this time around. 1547683200 WRC

The storylines that will dominate F1 in 2019 With the launch season for Formula 1 2019 just around the corner, the first controversies of the new year have already broken. But in many cases, the seeds of the stories that will dominate the series' news this year have already been sown 1547683200 F1

Why Raikkonen is more likeable at Sauber Kimi Raikkonen was the wrong man for a seat at title-chasing Ferrari, but that doesn't mean he's wrong for Sauber - in fact his contribution to Formula 1 is about to get a lot more positive 1547596800 F1

How F1's quick-fix 2019 rules were born Formula 1's 2019 aerodynamic rule changes have been divisive - pushed through too quickly and unlikely to do anything to help overtaking, according to the sceptics. The architects of the revamp explain their logic, and the accelerated process 1547596800 F1