The 2007 EDC competition used the DCM-104 Motor from All Electronics. That motor was manufactured by Mabuchi as a RS-550PF. The Mabuchi web site has some fantastic animations of motor operations. There you will also find a description of motor specifications. Notice the diagram which gives the equations for power in both electical and mechanical terms.
The closest part number to the RS-550PF is the RS-550PC/VC.