I need the same help have been playing with it the last couple days and today I turned it up and wow. Seems to have crazy power but the main question is top speed I got 72-73 mph today. I have 08 grizzly w/950 miles got from an old man who got it from the state police here in Michigan. They used it for a man hunt, then they sold it at auction 2 years later. Since I have acquired it I have added hmf swamp xxl and optimizer, itp 14" 212 27" mega mayhems wheel spacers 1 1/2 in front and 2" rears, wild boar front bumper and radiator relocator I have epi severe duty belt and clutch kit have not installed yet. Anyone give there setting for optimizer and top speeds it runs great just wonder am I over revving or not and any more you guys would suggest thank in advance.