I assume it is a pancar? looking at your name?
As said before, we need also track length, spur teeth, pinion teeth and tire diameter to determine what to do.
It is a pancar and runs on foam.
So every heat you have tire wear and the rollout will change and there fore the top speed will change also.
Give us motor type, spur,pinion,tire diameter and track length.
The we can calculated what to do.
Change spur/pinion or change settings on ESC.
Also check your sensor cable because if this is faulty, all your setting won't mean a thing as you drive sensorless and there fore no timing or turbo.

Regards Roy