What about the weight of the car too Edward. We have a guy from Japan racing here and his car was about 100 grams less than ours, running 2s and 25.5. We were using our 1s 13.5 and the pull that thing had coming out of the corners was insane compared to ours. We run ROAR rules @ 730grams. His 2s battery was lighter than our 7000mah 1S and his car was all milled out to get it even lighter. He now is on a ROAR legal RSD chassis, battery and motor. But I was really surprised at the pull that 2S adds coming out of the turns. It wasn't noticeably faster down the straight but that's the shortest part of the track, its the turns that make the times drop.