Sarah Fisher Hartman Racing head engineer Nathan O'Rourke explains -- in layman's terms (thank you) -- how ambient and track temperature impact drivers, the IZOD IndyCar Series cars and Firestone tires.

Read about it HERE in the blog.

Remember that the IZOD IndyCar Series season kicks off in less than two months with the Honda Grand Prix of St. Petersburg. Catch the action at noon (ET) on NBC Sports Network. Better yet, make the weekend event part of your spring break. GET TICKETS HERE