Kv ratings are like BHP on real cars they are tested at perfect conditions not actually at the wheel. I looked at a Traxxas slash 4x4 Rtr and in their statements with a 3 cell 20c battery the car could hit 70mph using a 3500kv motor, I fitted a 4500kv motor and 50c Lipo it was very hard to keep the wheels on the ground but clocked over distance was just short of 60mph but rpm of my motor was tested at 36500rpm unloaded (theoretically capable) but without torque it's not a useable figure. People use the TP motor because it has the torque and RPM needed, I use an old SP motor in mine an it is cooking at the end of 5 minutes but not far off the pace of others
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