This is my first jet boat and I am completely clueless on pump setup. I have searched the forums and read until I am cross-eyed on tips for improving my boats performance.

I have a 79 Hallett 19' with a 454 making about 450 HP. I am only able to turn up to about 4800 RPM with a plain old Berkley pump (no droop, diverter, grate, nothing...).

What is a good general approach to get more performance? Do I start with the impeller? Droop? Diverter? Or is it some magical mix of many variables. There are not a lot of expert sources in my area.

How do I identify which Berkley pump I have? Click image for larger version.  Name: Hallet 02..jpg  Views: 168  Size: 42.3 KB  ID: 14Click image for larger version.  Name: Hallet 03..jpg  Views: 163  Size: 48.4 KB  ID: 15

I appreciate any help or direction.

Thanks,
Dale