I'm running 6S1P for racing, on my mayhem.. 12XL, 20/46 gearing, and it's enough for a 5 minute race.. just barely enough...

Here's an old 5s2p A123 ET from my revo on 8XL on a single speed run with normal gearing:
During this I just did a hard launch and let it get up to speed and wind out. 120A@ 14 volts. That lasted for nearly 1 second, and I was over 50A for a second and a half. To sustain the speed I only used ~450W, but acceleration takes a helluva lot of power. Why I don't like 1p for so much power is that driving around you are constantly accelerating and hitting power spikes. Doing too much of this stresses the cells IMO. The cells don't get a good cool down period in-between spikes. If you are hammering it like that for the whole pack.. I just think its too much and you can tell it by the way the pack heats up so much. Depends on your driving and needs, but I'd just be careful w/ it
http://i7.photobucket.com/albums/y25...4/e978f2b9.jpg