My experience has been that when I spend more time making my car's setup better, my lap times improve more than when I worry about a better battery or motor.

While I like to challenge for the podium every time I race, over the years I've learned that I'm really racing against the clock and myself. Even if I'm running an "inferior" motor, "old" battery, or "obsolete" chassis, I can still try to get the most out of the equipment I've got. On those rare days that I do get everything right, it is one of the most rewarding feelings I can get racing.