New to pressure washers
 

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.

I have an old AR pump that was tired. I got parts for it from these guys
https://www.pwoutlet.com/
I talked to a guy by the name of Jody Doyle 858-277-4430 very helpful.

Sam Mac
Thanks, I looked at their site and the parts are pretty expensive. I think I will try one of the $100 Amazon pumps.

I bought one of these inexpensive Sun Joe SPX1500 for less than $100 new in 2019. I've used the heck out of it from power washing the house to retaining walls to decks to walkways to fencing and even to farm tractors and it's still going strong. A little less GPM than yours but I'm on a well so gotta be careful. They do make bigger units. For less than $100 and 5 years of good use it's a heckuvalot cheaper than buying parts to try and keep an older one working IMHO. I got mine at Lowes.

https://www.amazon.com/Sun-Joe-SPX15...01IJ2SCF0?th=1