Not bad. Kinda reminds me of the indy 500 logo. Maybe play off of that and try to mimic the indy 500 logo a little closer. i.e. wings on either side of the Garff "G" incorporate the lettering into the wings.
I like #63. Can you put the "G" in the center like you did with #50. I want the lettering all solid red, and "motorsports" needs to be bigger (make sure to add the "s" to motorsports). If you can integrate the G into some form of a wheel or Tire, that would be awesome. Thanks!