Lap comparison between my Saturday and Sunday runs with National Auto Sport Association (Nasa) running at Homestead Miami Speedway Club Course configuration (Double Infield) in TT4 class. 

Top lap is Sunday fast lap and current Track Record (1:39.585). Bottom is Saturday fast lap (1:39.724). 

Both laps were set with the same tires, the Hoosier R7. If you notice on Sunday the car has a misfire up top, which you can tell by when the shift light starts acting erratic and showing premature redline.