brushless 1/5 4wd conversion about to begin! couple questions.

[MetalMan]

Just to throw it out there: my XLB (1/7 4wd 15lb center diff buggy) now runs a 1521 2Y on 10s 3700mah Lipo through a HV-110. It's geared for mid to low 40s but it pushes out over 5hp on peaks (loads of power). The HV-110 heats up to about 120-130deg. after maybe 10mins. I'm sure things would cool down a bit if I played with the ESC settings but this might give you an idea of what to expect from an ESC.