Just some help for anyone having erratic turbo boost or the car feeling flat. I changed laods of settings, motors etc because mine was doing this (xtreme stock 518 stock 10.5 nosram motor) And it turned out that the battery was no longer any good, it was a 3200 20c EC power lipo and was nearly 2 years old, i then put my newest 4200mah 30c lipo in and everything was fine again. So if u have this problem make sure ur battery is still good