Thanks for the comments, guys!
Serum - I decided to try something a little different with the tires. Both wheels are 17mm hexes :005:.
AAngel - I have yet to see a spike over 120amps. Sometimes the voltage will be at a lower point, like 11.5v (down from 12.5v) at a 120amp spike, even when the battery still has a lot left in it. So, it appears it isn't capable of going over 120amps.
Dafni - It was fine without the body :). Besides, both of my bodies for it have large cracks in them :(.
luvsrc - 5s A123 is 16.5v, 5s Lipo is 18.5v. There's a bit of a difference, but 16.5v is fine with me. I have yet to see my 540C 7XL get above about 150 deg. F, in the street or on the track. I do punish it pretty hard on the street (as you can somewhat see). With the Maxx mashers the 7XL got to about 140, and with the 1/8 buggy Road Rages it got to about 125. The Feigao 540C 7XL is pretty much the same power as the Hacker 7XL, but the Hacker 7XL should be slightly more efficient (I don't think it's enough to justify the almost doubled price).
elegal - The gearing was the same for the MT tires and for the buggy tires. I was surprised that it was going so fast even with the smaller tires.
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Originally Posted by Serum
nice thing about lipo's you can have more runtime (capacity) at the same weight.
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Yeah, that's one reason why I'm going Lipo in my Hyper 8.
The A123s do have one major advantage, though. They aren't sensitive to overvoltage like Lipos are. Because of this, I haven't felt the need to balance either of my 5s2p A123 packs in a while. I've gone through about 5 cycles each since I last balanced them.