The fine design hits 60 mph on 4s, mine will be geared for 50-60 mph any faster and the car starts comming off the ground because air goes under the body and lifts it up. He said that to do 80 mph you would need a very low profile body like a wedge. He said I will still have a blast only going 60 plus my electronics will run super cool and I will get great run times I trust his judgment and told him to do everything his way.