Well I know those calculations and I have done it with almost all my cars. Well this is not my first brushless project, this is my third brushless project with big LiPo packs. I have done one Traxxas E-Revo project and Ofna Jammin CRT Pro project conversations with brushless motors, brushless controllers and LiPos. Im just thinking about that what would be best setup for mugen. Thanks very much for helping me ! I will look some batteries and motors, and I will buy them soon if I find everything what I need.