Problems with Porsche 911 High Speed Chase; Cannot Finish 1st, but I did Finish 2nd!

I have the Avatar at the lowest setting! The Porsche 911 is NOT fast enough to overtake the other car in front! I tried many times; I finished in 2nd place at best! I cannot achieve 1st place to move on in completing The Forza’s Driver’s Cup! I have the Xbox 1 X! I cannot go ahead…Any help or suggestions I would appreciate!