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

How to make F1 strategies interesting The FIA has asked tyre companies to submit a tender application to supply Formula 1 rubber from the 2020 season, with 18" coming in 2021. PAT SYMONDS asks if alongside the new tyres, steps need to be brought in to make sure future race strategies are varied and interesting 1537574400 F1

How a WRC rebel is becoming a title favourite Ott Tanak has gone from being repeatedly dropped and swearing at M-Sport to leading Toyota's World Rally Championship charge. It's already a remarkable story, and it could have a spectacular ending 1537488000 WRC

The F1 outcast who became a surprise star in 2018 One of the stars of the 2018 Formula 1 season is a man not even on the grid anymore, but who has revelled in a surprise new role after being abruptly jettisoned by his team last year 1537488000 F1

Lola's 10 greatest cars Choosing highlights from six decades of Lola success was a tricky task, but here are Autosport's pick of the marque's finest cars - including test drives of the top three 1537401600 Other