This is a general misconception as the speed governors merely operate to control the speed of a vehicle to the set speed of the governor. they either work on the fuel line or on the accelerator. Either of the speed governors never impact the engine or the pick up. The pick up of a vehicle would depend on a variety of factors which include horse power of the vehicle, contracted load, torque of the engine, condition of the vehicle and the engine, no. of kilometers run, condition of the roads etc.
Government of Andhra Pradesh have notified the fitment of speed governors on all transport vehicles vide G.O.Ms. No .... Dated. 14.7. 2009 The same has been published int he gazette on the 16th of July, 2009. Vide the said notification the following are the speeds notified:
Before purchasing a speed governor you must check if the speed governor being purchased has a valid approval from the testing agency as prescribed by the government of India. the certificate of approval should be specific and be applicable for
Make of the Vehicle
Class of the Vehicle
Speed as notified by the Government namely 50 KMPH or 65 KMPH.
As a matter of caution please check if the vendor selling the speed governors has got a good service back up.