my friends have 1/8th hong nor electric truggys he uses a1300kw electric motor this is about as powerfull as you can get.on a drag race{100 meters plus}the nitro wont get past till{that my mugen and a nice 5 port rb engine}top of the revs,it the way you gear electric you gear down to get more revs {less strain on the engine}you need to get good lippos these aint cheap but over a 100 recharges,cheaper lipos are avaible,for instance if you use a 2000kw motor you can get away with 14 volts,{less money}some 1/8th use 2700kw or 2400kw,it depends on power and speed.heres a link for lipo batterys,
http://www.bigsquidrc.com/lipo-battery-shoot-out/,it gives you speed and times for lipos