So, could the fact that im running 18% oil, and 15% nitro fuel in my tower hobbies nitro st-15 be why it has no low end? It seemed to have good top end, but it took it a minute to get there. Also after i shut it off, and fill up with fuel, it will just barely take off without dying, it seems so rich, and i have to use about 1/4 of the tank to get it warmed up, and running right again. I have never tried nitro with lower oil content, so maybe its the problem? Quadzila99- What kind of low end performance gain did you see? Does it run a lot better? Thanks

Eric