function vhandling ( )
   for _,v in pairs(getElementsByType("vehicle")) do
      if getElementModel(v) == 559 then -------------- vehicle Id
        setVehicleHandling(v, "maxVelocity", 500.0)
      end
   end
end
addEventHandler ( "onPlayerVehicleEnter", getRootElement(), vhandling )

addEventHandler("onVehicleEnter",root,function(plr,seat)
if getElementModel(source) == 559 then
    setVehicleHandling(v, "maxVelocity", 500.0)
    end
end)

addEventHandler("onVehicleEnter",root,function(plr,seat)
if getElementModel(source) == 559 then
    setVehicleHandling(source, "maxVelocity", 500.0)
    end
end)