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Timer to fill ballast bag?


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So I am getting ready to upgrade my stock 250 tanks to 750lb sacs. I am thinking ill only want to run 500lbs of the bags when I have a bunch of people in the boat. 537 prop currently. My dad skis behind the boat so I don't want to go to a 1235 prop.

So what I was thinking is to put a timer on the factory switch with 3 selections. 1/3,2/3 and full. I could calculate based on flow rate of my pumps. Doesn't have to be perfect.

Anybody thought about doing this???

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Have you considered just venting the bags, when they are full it will dump out the side of the boat. I'm not a fan of timer systems, just another item to malfunction. Are the timers actually able to be programmed to different shut off points? I always thought it was one set time, not multiple set points. However, I could be wrong.

And I have towed a few people with the 1235 at 33-34mph with no issues. I even towed one last year with the 2315, not a problem.

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