[Frank1541]

I got a ten year old Generac One PW recently. It works OK. It does not have the same power as my neighbors Generac One. I got a pressure gauge to test it out. I am still a novice when it comes to these things.
Using a Tiny Tach and the gauge I got following with a 15degree 3.5 nozzle.
3500 rpm, 2900psi with trigger off.
3300 rpm and 2400psi with trigger on. Should the rpm drop that much?
I am also puzzled by the claimed specs for this unit. Generac says it puts out 3100psi and is rated at 2.8gpm. The pump is an Annovi RMV2.5G30. This is rated by Annovi to put out 2.5gmp and either 2500psi or 3000psi at 3400rpm. (they are not clear why there are two pressure ratings).
So how does Generac come up with their 2.8gpm and 3100psi rating. Is it plain old marketing BS or are they running the pump above the 3400rpm rating.
I will probably adjust the governor to get 3400rpm under load and see what happens. Maybe one of the those cheap pumps on Amazon are in my future.