Okay, so a micro can cover 30meters (300ft.) to reach 80 mph.
We have the distance thing covered.
Now, All you have to do AJG is to measure out 300 ft. Have your cameraman take your car out to a little over 300 ft. and check to see if your car can respond without any major glitching. If you can do that, you will cover your range problems.
By the way, find someone to document it on video. That way, you will have no problems when you post that you accomplished that. After that, we can work on the car itself.