Excuse from my disturb and curiosity!
Could anybody tell me if have tried to compare with 17.5/21.5 stock spec BL with the conventional 540J on the same track, really the BL has enormous advantage?
In the case i have heard(not sure, due my uncapability in chinese)in HK and somewhere in China, which has allowance to racing in silvercan class the BL motor within 3000KV.