I had the traxxas titan 550 motors in my terminator cold with the evx2 speed controller. For some reason the rear motor just stopped working - completely dead. I put battery power directly to its terminals and nothing. I was wondering if there are any other brushed motors you would recommend that would provide more speed but still have some nice torque that will work with this speed controller. I am running a 4s lipo 5000 bat. thanks.