8gpm pump for gx630?

I’m not in the market right now to replace my 5.5, but if I was looking to put an 8gpm on my 630, what PSI would I get out of it?

If someone has first hand experience vs a formula I would appreciate it.

A formula is first hand. Laws of math and physics don’t change.

Too many variables to apply a simple formula.

@Anthony28 did it I believe, I can’t remember the psi,ask him @dcbrock ,or it was a gx390. My rememberer is broken

Maybe 3000 psi or so and 7 gallons?

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That is an incorrect statement.

Mine is a 390

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You are going to push motor to hard you would be better off to sell it and buy a whole unit. Although I dont know why you would want a 8gpm machine anyway

There is no pushing the engine to hard. It will run within it’s specs regardless of what pump is on it.

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Really just more efficient surface cleaning. The 5.5 is fine for housewashing.

5.5 is plenty to clean concrete. If you’re washing concrete all the time then yes…8gpm is king. I xjet 3% pre and post treat and almost run behind my WW Eagle Wash. But I don’t do driveways much because I don’t enjoy it as much as house washing. I would think a 8gpm pump would get around 2600psi…ish with a gx630 with 200ft of hose (guesstimate)

If I had to just throw out a number I think you could get. I would say approx 8,575 psi.

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Lol…

Revisiting my thread…

Anyone have a pump brand/model number I could look at for a bit more GPM? Did a house wash today and the breeze wouldn’t let me get the 2nd story peaks very well with the LP shooter tip.

The 630 is only using about 17hp so I have another 3hp or so to play with.