Given this scenario, Senna secured an IndyCar testing session with the support of compatriot and Penske driver, Emerson Fittipaldi. In December 1992, in fact, Senna visited Firebird International Raceway in Chandler, Arizona near Phoenix in the United States to test a 1992 Penske PC-21 CART Indianapolis car. Unlike the more advanced F1 cars, this IndyCar was powered by a turbo Chevrolet-Ilmor V8, had a traditional transmission with clutch pedal and iron brakes, and was markedly heavier due to its bigger physical size in comparison to a smaller Formula One car; IndyCar teams were run with significantly smaller budgets than F1 teams and did not have to make their own cars. To familiarise himself, Senna initially ran 14 relatively slow laps before completing a further 10 laps on the same tyres and setting a best time of 49.09 seconds. By comparison, Fittipaldi had set a best time of 49.70 seconds, which he later improved to 48.5 seconds, only by using the new 1993 Penske PC-22 at his disposal during this test session. In a 2018 interview, Fittipaldi revealed that Penske boss Roger Penske was ready to enter a third car for Senna to drive at the 1993 Indianapolis 500- one of the most prestigious and important races in the world and a race that defending champion Mansell was competing at (who had left F1 for CART), but McLaren boss Ron Dennis found out it was a very serious deal and banned Senna from competing at Indianapolis.