Strong run in Detroit Foster tied his career-best finish of seventh in the NTT IndyCar Series Chevrolet Detroit Grand Prix on Sunday. Impact This makes two Top-10 finishes in the past two races for Foster as the Rahal Letterman Lanigan Racing driver appears to be figuring out IndyCar. Foster was aggressive on Sunday, using contact to his advantage at multiple points. Up next for the IndyCar Series is a visit to Gateway, where Foster crashed last season and finished 26th.