i've ordered a new e-max (3905) that i'm going to put my mm-esc/8xl motor in spo i wonder what kind of preformance i will get on a 5s2p A123 pack ? coud i get like 20min's runtimes ?
With 4600 mah worth of batts you will probably get at east 20mins, maybe more. With a 7xl in a tower terror (10th scale mt like the emaxx) geared for 45mph, running a mm esc and 5000 mah 4s lipo I got around 30 - 35mins of runtime. That is a hotter setup than the 8xl, which should post better runtimes than the 7xl. And run cooler, although i did not have heat problems with my 7xl.