if you lower the frame rate setting to 5.5ms you'll notice the speed difference... you need to have digital servos howerver... i'm running ace 1015 servos in my losi 8's... also i'm using lipo rx pack without a regulator... at 6v they're rated at .10, at 8.4, silly fast... with the 5.5ms setting you can't even see the wheel... lol