i have no problems tuning nitro cars or trucks... i have a t-maxx a rs4 ss this ofna mbx comp buggy.. i also have to tunnel hulls one 3.5 one 7.5..i used to own a ek-4 with the .70 i sold it though....so i ve been down the road of tuning once or twice....its only on it 5 tank of fuel...but my t-maxx takens off alot quicker and runs top end better than my buggy..and im think it shouldnt be that way...right or wrong