I just took a 1979 Southwind tunnel on loan from my parents! I had previously owned a 25 ft. deep V I/O. So I have some questions about the jet drive as it has been a few years since boating on one. We use to go boating in the jetboat growing up and I loved it. The first is it takes a good 20-30 seconds of the engine running in the water before the pump spools up with water. Is this normal? Second the engine has an estimated 550HP with an A impeller. The boat ran 76.1mph at 5400rpms on my Iphone GPS app. Does this sound about right? The boat is a ton of fun. Thanks for any insight in advance.