right....my top speed is lower with my 1515 1y vs the 6xl but wowothe max temp that i reach is 114f(compared to my death feigao 6xl 290f) for 20 min of street bashing....
you have a 1515/1 and a MMM I would go up to a 5s pack and if that is not enough you could go to 6s...you can wire a 3s pack that is idenical to one of your 2s packs in series to form a 5s pack..."You need more power"...when you go higher kv the motor becomes more amp hungry and that will cause heat
this is what i tinkingbut now i have a 1515 1,5d to come...can i run this motor on 5cell ??? or keep 4 cell...i would 45mph im geared 20/68...
I think 4s will be plenty for a 1.5d but it will eat more amps causing more heat, be sure your timing for the ESC is at the lowest setting, and I went back looking at your first post and it looks like the truck you have is an E Revo if it is the biggest 8000 size you could fit in the compartment would be a 2s