Turnigy 1/16 Beatle RC car speed Control using Servo library


I have been working on this RC car Turnigy 1/16 Brushless 4WD Monster Beatle w/ 25Amp System V2 (ARR). My project is to make a self navigating car using GPS. The trouble I am having is controlling the speed of the car. I am using the servo library to control the esc. The esc activates at servo.write(90). The car starts moving at servo.write(95). But the car speed is very high and it is just impossible to control the car at that speed. Is there a more precise way to control the esc? Can it be slowed down through software?

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