Draft another car and bumpdraft them. When on straights, press to pull ahead. Keep steady when using the boost; otherwise the car in front of you will spin. To win you must boost around the car in front of you out of turn 4. You will win the race easily.
Upgrade you car to it's max performance. Every time you go down the backstretch, hit the boost until it is gone. Do this in every lap and you will pull away from the pack.
Max out your car's performance. While going down the backstrectch, press [Boost] until you are either out of boost or are just before the turn. Slow down going into the turn since the tires will not grip unless they are new just off of pitroad. Continue this for the entire race and the pack will never be able to catch you.
During offline races there is a thing called "Focus". When online, the "Focus" becomes a "Rolling Pitstop" and will not slow you down. Its purpose is to keep everybody on the track and not on pitroad, making repairs. Note: The "Rolling Pitstop" can only be used when the wrench it lights up on the farthest left-hand side of the power-up meter.