2011 Ranger Z118 with Mercury 150 Optimax, 8 " jackplate, 23p Tempest plus. If anyone has this setup or can help me out, please reply. I am trying to figure out the best height to move my motor to to get the fastest speed possible. I know this is not a rocket but I want the most that I can get without burning the motor up. What top speed, rpm, water pressure should I be looking for. So far I can not get it to turn the motor over 5450 rpm.