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Old 07-16-2018, 10:24 AM
[email protected] mjstonework122@hotmail.com is offline
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johnson 1000 gpm aerator pump vr 750gpm

So I have a 2001 x star and of course I would like the ballast to fill faster. My question is if I went with a 750gpm or even a 500gpm cartridge would I get better filling torque from the different sized impeller? I actually called johnson pumps and he says that the 1000 is faster but I really think there should be different factors that he just wasn't taking into consideration. I have two 720s in the back lockers, and a center ski locker sack from wakemakers with it piggybacked to a flyhigh integrated bow sack. the flow is fairly week by the time the sacks are full especially in the bow sack set up.
Similar to going with a smaller sized prop for low end torque vr a larger size for more top end...
Johnson does claim that the electric motors are the same and the only difference is the impeller size. I speculate the pitch may be different as well.
I know a test is worth 1000 expert opinions so I'm hoping someone has some first hand experience.
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Last edited by [email protected]; 07-16-2018 at 10:42 AM.
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Old 07-16-2018, 11:46 AM
Roman Roman is offline
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I think you need to look at the system as a whole.

Is everything being filled from one pump?
If you have multiple pumps, are they feeding from the same intake?
Do you have manifolds in the system? Where and how many ports?
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Old 07-16-2018, 12:17 PM
MLA MLA is offline
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All aerator pumps are subject to head pressure. Between 20%-25% loss is normal. Sounds like you are pushing water through one sac, into another. No aerator is going to overcome head pressure. Yes, you can increase the flow rate, but the head pressure will still take its toll on the rated flow rate.

Ive tested Attwood and Rule aerator pumps, and found that as I went up in advertised flow rate, the flow rate increased.
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Old 07-17-2018, 01:26 AM
Tsumi Tsumi is offline
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I highly doubt that the impellers are different between the different pumps, they just spin at different speeds.
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Old 07-17-2018, 06:41 AM
tomski2001 tomski2001 is offline
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I have the same boat, MJ, just wondering what bow sack you went for and what sort of weight you think it holds as there doesn't seem to be a a lot of space under the bow seats.
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Old 07-19-2018, 10:14 AM
[email protected] mjstonework122@hotmail.com is offline
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Quote:
Originally Posted by tomski2001 View Post
I have the same boat, MJ, just wondering what bow sack you went for and what sort of weight you think it holds as there doesn't seem to be a a lot of space under the bow seats.
i have the fly high bow sack under the bow seats and the ski locker sack. My best guess is it is about 300lbs in that bow space. It still needs lots more weight up there i use a 750 for the walkway sack and i put it as far up front as possible. I'm pretty happy with it but the wake is still pretty lippy at 23mph. (checked with the gps btw). the back has 2 720's (20x20x45) not the 750's (20x20x50) that everyone uses i found that it pinches the drain pump line if you use the 750. Honistly i would have gone with less weight in the back just to make riding at slower speeds possible but that would have a negative affect on the surfing wave which i am doing about half the time now days.
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Old 07-19-2018, 10:19 AM
[email protected] mjstonework122@hotmail.com is offline
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Quote:
Originally Posted by Tsumi View Post
I highly doubt that the impellers are different between the different pumps, they just spin at different speeds.
the guy that i talked to at johnson says that impeller size is the only difference.....
i think he was just trying to get off the phone so take it with a grain of salt.
I just bought 750gpm and i will try to post fill time results.
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Old 07-19-2018, 10:22 AM
[email protected] mjstonework122@hotmail.com is offline
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Quote:
Originally Posted by MLA View Post
All aerator pumps are subject to head pressure. Between 20%-25% loss is normal. Sounds like you are pushing water through one sac, into another. No aerator is going to overcome head pressure. Yes, you can increase the flow rate, but the head pressure will still take its toll on the rated flow rate.

Ive tested Attwood and Rule aerator pumps, and found that as I went up in advertised flow rate, the flow rate increased.
thanks for the good information much appreciated.
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Old 07-19-2018, 10:28 AM
[email protected] mjstonework122@hotmail.com is offline
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Quote:
Originally Posted by Roman View Post
I think you need to look at the system as a whole.

Is everything being filled from one pump?
If you have multiple pumps, are they feeding from the same intake?
Do you have manifolds in the system? Where and how many ports?
i have 1 fill and 1 drain pump on each of the rear sacks and 1 fill and 1 drain for the ski locker and the vent line on the ski locker goes to a Y and is fed to each arm of the the bow sack. all is 3/4'' connections. just saying it would be nice to swop out the ski locker fill pump cartridge to a lower gpm if that would increase pump head pressure..
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Old 08-22-2018, 04:07 PM
[email protected] mjstonework122@hotmail.com is offline
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Okay so the 750 is definitely slower for this than the 1000 gallon per minute. Go figure haha
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