I will jump to the 03. Just everyone is saying 25025 at 4gpm is 2500 psi but not by my gage which is accurate. Im getting 3300 psi. Saw a bunch of etching but after closer inspection i think it was done years ago with someone using a wand.
Pretty sure you have to account for the multiple nozzles somewhere in there…your gauge at the pump is giving you the pressure of the entire system, not what’s hitting each tip, if I’m following. I wouldn’t read too much into the guage either, it’s more of a check (and if it ever gave you more than the dealer’s stated rating without juicing anything up, i’d wager it’s definitely not accurate). Use the chart to get where you want to be, divide the # by the # of nozzles you have and round up/down to the nearest half depending on where you want to be from there.
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But how do you even know the gauge is accurate?? I think you may be overcomplicating this whole thing. Just go make dirty stuff clean & it’ll all work out. Driveways aren’t rocket science.
Without pics we’re all just shooting in the dark.
You might’ve used too much pressure or not enough. Hard to know without knowing you’re full setup.
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Don’t feel bad, I still get dirt stripes even with an 8gpm and four nozzle Whisper Wash. Etching is a whole different matter though, try the 2503’s or even 40025’s.
Also you don’t have to get a full blown 12v system, I built a portable unit in an ammo box that works well.
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At this time, I’d say forget the gauge and just purchase a few varieties of the sets of tips that multiple people have suggested. Unscrew old tips, install a pair of the new suggested tips, try out on concrete, then observe.
Good on ya for trying to get the science down on paper before before performing the experiment, but don’t be afraid to try them out.
And, as mentioned above, a photo or two would go a long way in helping us to understand what you’re up against.
You’ll get it figured out. Everyone struggles with this exact situation at least once in their career.
Im gonna put the 2503s in both my SC tomorrow.
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The second thing you might want to check is how you have the tips setting on the bar, Inline with with outside or inline with the bar? I set mine to the bar helps on the stripping. And angle of the bar too.
Yes it is set correct. We fixed the problem today by removing the 25025 tips and replacing them with 25030. That put both SC units, a 20" and a 18", at 2400 psi, checked with 2 accurate gages. Thanks for your time reading and responding.
What machine do you have? It clearly puts out more than 4 gpm, so if it’s rated at that you have an overachiever.
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I got it under control today with 25030 tips. Now putting out a cool 2400 psi to the concrete.
Well his gauge is infallible, so he’s got a 4.6 gpm apparently
Same number with 2 gages. Sure hope it ain’t 4.6, no buffer tank.
Not trying to plant a flag on this hill. But there’s only a few scenarios and it seems like you’re leaning toward the one that’s least likely!
Either the pump is 4.6 gpm, the gauges are wrong, or the math behind fluid dynamics is wrong.
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I was going to say it sounded like a 5.5 earlier, since they seem to always come in lower than the rating. If some manufacturer has them coming out higher than rated, I’m all ears…
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I doubt it. Its a Simpson.
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Are they the same brand of nozzle? Both sizes flat spray? That’s a huge difference for one nozzle size difference. Glad you got it resolved though. I was hoping it would put you about 2600 or 2700.
Yes they’re flat, same brand. After i put them on the gage I found a small slice of dirty concrete to run both SC over and they appeared to get the dirt up nice. Have a big driveway to do this morning so it’ll put em to a nice field test.
Don’t forget before and after photos!
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