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

When a WRC title contender went racing - and won Thierry Neuville's day job is trying to claim the World Rally Championship for Hyundai, but he also found time to go circuit racing and claim a touring car earlier this year - with a bit of tutoring from a tin-top legend 1571443200 Performance

Did the right driver win the BTCC crown? Accusations about BMW's "DTM" machinery and some particular twists in the three-way battle for the BTCC title might raise questions over Colin Turkington's 2019 achievements. But playing 'what if' shows his merit 1571356800 BTCC

The growing 'GP1' fear over F1's future As Formula 1 heads to its next era, fears of a GP1 'spec series' are surfacing among team bosses and designers. Will F1's push for better racing close down creativity and create cars that all look the same? 1571356800 F1

The Button insight that explains Vettel's inconsistency Sebastian Vettel's form has no doubt improved, but it's clear Ferrari's 2019 Formula 1 car doesn't suit his style. One fellow world champion can relate to that - an example that proves just one characteristic is the difference between the great and the good 1571270400 F1