wow thank you very much you were so much help. but i think a starter box is more useful then because it will help my engine last longer. by the way is the engine fast. i have hpi rs4 3. i took it apart and replaced all the old plastic parts with new ones and cleaned it. the engine was 35$ new. also i picked up a hpi tornado RTR for 130 (hot bodies) it has carbon fiber upper deck and front rear shock towers are carbon also. on to of that it has a .18 engine the car is very clean and has only been ran on 30%.
my next question what fuel should i use for the .12 is 30% good or should i use 20%