Note: This strategy can be used for any sprint achievement or trophy. Use the Dallara Indy car (Open Wheel Class A) and tune it as follows.

Brake Bias: +30-+50 (to reduce understeer)
Differential: 0
Downforce: +50 (for cornering, specially at Okutama and Hong Kong)
Ride Height: -30 (for cornering)
Gear ratios: -50
Suspension (front and rear): +30 (for stability)

Then, select a custom cup, choose a track, and set flashbacks on unlimited and the AI difficulty to medium.