Today, i had a chance to try my 1900kv on my xt8 truggy. i mate motor with sct pro esc and gear ratio was 18/44. i am using 50k silicone oil on center diff. i drove it on little rough grass surface. Car performed very well but power delivery was much smoother. i was using 1515 2200kv castle motor with rx8 esc and16t pinion and vf8 gives me same punch. very impressed. however, motor temperature was 185 degree fahreneit which is 24 degree more then the castle motor. Overall, i am happy with that. i will probably buy another xt8 and put this setup to use it with my brother. i will upload a video of first use as soon as possible.