Mi T Wash 14 Report post Posted April 5, 2006 I have a 5000 PSI, 4 GPM, 20 hp Honda, belt drive cold water unit. The Mi-T-M CWC-5004-1MGH. I am interested in upgrading the pump to 6-8 gpm. Can anyone tell me where I can go to get the best pump and technical help replacing it. Is there a chart that can tell me for each gpm I increase, what is the decrease in PSI? Share this post Link to post Share on other sites
Larry B 55 Report post Posted April 5, 2006 The formula is gpm X psi / 1100= hp required. Approximately 6.0 gpm@3500psi = 19.1 hp required. Share this post Link to post Share on other sites
Russ Johnson 141 Report post Posted April 5, 2006 What model pump is currently on it? Might be able to get a pump with the same footprint to save drilling new holes. Share this post Link to post Share on other sites
