Hm. Going to be a little tough to give you as full a feedback, particularly on color and typography.
Also, I only see one design.
Looks like you're on the right track (oooh, racing pun) with this one design though. I think the choice to use the checkered flag as a dominant design element in the top left is a good one. It helps draw the eye and set up the viewing experience for the rest of the website.
The navigation seems large and easy to use.
I like the image placement, though I think it could use more. Maybe in the top bar?
I'm also not sold on colors. I'd ditch the blue and use red, orange, yellow and metallic gray.
Maybe green, but use it very, very sparingly.
Maybe use the tachometers in the lower left as call to cation buttons as well?
That's about all I can offer at this point. I think you're going in the right direction and can't wait to see the finished product!