I am going to build a GTP chassis kit. I will be using a RCM motor mount and mmm 2200kv. I plan on using 2 2s lipo packs @14.8v with a mah of 4000 each. What kind of run times am I looking at? I will be modifying drift type tires not too much topend speed runs here just want a 1/8 scale drifting beast. Thanks