Up arrow or W to throttle, left and right arrow keys or A and D to turn, down arrow, S, or space to brake. If you tap the break while turning at high speed your car will start to drift. If you can control it then you can get round tighter bends at higher speed. Doing this for multiple laps will make the map lag behind on your position, so don't rely on it if you're planning on staying above 140 MPH. Ignore the other cars. They're just there to make you less lonely. My record is 1:44.96 seconds