The first 4-pole motor with a built-in chip which helps esc identify it's a hobbywing motor (only when pairing it with the xerun xr8 series of escs) and the xr8 esc create a power system which is able to work in the ""sensored"" mode (at all times) and provide users with the better performance and smoother control. Note: this motor is compatible with other escs but unable to work in the ""sensored"" mode at all times. The turbo timing which is widely used (by 2-pole motors) in 1/10 scale on-road racing can be enabled to unleash the utmost power of the motor when pairing the xerun 3652/3660 g2 with the xerun xr8 series of escs. The hobbywing-patented ""error-free"" hall sensing system adopted by the motor guarantees users the steady operation in the “sensored” mode. A separate high-speed high precision encoder always outputs the clean signals (indicate the position of the rotor) and protects the hall sensing system from other signal interference. The hobbywing-patented 4-pole-8-magnet ""staggered pole"" rotor with the extremely low cogging effect and torque pulsation greatly improves the driving feel around corners. The use of double insulated windings (200? R-leveled), japanese nmb bearings, super thin silicon steel sheets and the high-intensity adhesive (300?) guarantees users the outstanding performance and great durability. (with the strength of the motor is guaranteed,) the wheel hub design adopted by front & rear end bells effectively reduces the motor weight. Hobbywing xerun 3660 sd g2 features: full-sensored mode turbo timing technology bi-directional adjustable timing advanced hall sensing system low cogging torque quality materials & excellent design turbine design compatible with the xerun xr8 sct esc spec check: scale: 1/10th brushed/brushless: brushless sensored/sensorless: sensored pole count: 4 kv rating: 4300 lipo cells: 2s no-load current(a): 4. 7 resistance(m?): 3. 8 o. D. (mm): 36mm (1. 417in) length(mm): 62 (2. 44in) shaft diameter(mm): 5 (0. 197in) weight(g): 218 shaft length(mm): 17 (0. 669in) timing: 20-40 degrees (adjustable) (hw30401152)