My brother had the 7800kv ezrun. On a 1800mah 25c 2s lipo it was ballistic. His was geared to run at about 40+mph and it would do rolling wheelies for fun.
For racing i would go with the lower Kv motor on 2 cell lipo. If you really wanted high speeds you can always put a 3 cell lipo in it but i think you will find the 5400kv plenty on a good 2 cell lipo.
We tried a 3 cell lipo in his car but took it out after about 1 minutes use because it was undrivable. his car flipped over backwards at about 50mph because he thought the car was close to top speed so he squeezed the trigger to the stop. It still had plenty to go hence the huge crash.
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