I put together this toy after my wife told me I couldn't have one. "But honey, I'm putting a pressure washer in it, it's a work truck" Fast as hell, back in, hook up water and go.
Hey Paul, I thought about you today. I went to look at a used machine and used your formula gpm x psi / 1100. And told the guy he was full of sh#t. He advertised it as 6 gpm @4500 psi with a 16 hp vanguard. Thanks