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

What we've learned from the first F1 test Mercedes proved F1 innovation is alive and well, Williams banished the demons of 2019, while Racing Point's gamble appears to be paying off. Our experts on the ground weigh up all the major talking points from the first week of F1 testing 1582329600 F1

The urgent decisions Supercars must make after Holden's demise General Motors' decision to kill off an Australian motorsport icon isn't just a huge blow for sentimentalists, it's cranked up the urgency in deciding a way forward in Supercars' existential debate 1582243200 SUP

What "unique" Marquez deal says about his and Honda's ambition A four-year contract extension is unheard of in MotoGP - but that's exactly what Marc Marquez has in his back pocket from Honda. Even if the deal doesn't appease his detractors, it's still the option most likely to guarantee Marquez what he craves most 1582243200 MotoGP

The testing failure Ferrari didn't need An engine failure for Sebastian Vettel that robbed Ferrari of hours of running on day three of testing was a setback the team could really have done without - especially given the long-run averages don't match up favourably in comparison to Mercedes 1582243200 F1