what is the best way to hook up 2 3 cell lipos for the most speed?
mike

in a series....it will keep the same capacity, but have the voltage of two 3 cell lipos.. (22.2v)...if you want the same voltage as a 3 cell lipo, but double the capacity (twice the mAh, twice the C rating) you can wire them up in parallel....

make sure your esc can handle the voltage

...and make sure the entire system (LiPos, ESC, and motor) can handle the increased current at the higher voltage...

also, does your esc have LVC?

IM NOT SURE, JUST BOUGHT NEW 4700 LIPOS, BRUSHLESS MOTOR WITH ESC, AND 1:24 GEARS FOR THE TRANS.
GOD THIS THING BETTER BE FAST