540 size sensorless brushless for cars The 4600Kv motor is great for short tight tracks where accelleration and torque rule the scene. On 6 cell NiMH or 2s Lipo packs, the 4600Kv motor has been clocked at 30mph in standard 10th scale buggies and trucks with standard gearing. With 3s lipo packs, you can expect 45mph for larger tracks. The 4600Kv motor is roughly equivalent in top speed to a very good 12t brushed motor on 6 cells.