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Thread: Upgrading from gravity 1 to 3
12-13-2009, 08:39 PM #11
Get rid of the sprinkler valves. Two ways to upgrade. You can use 3 pumps to fill and three pumps to drain. Or you can use the Jabsco reversable pumps. They have their own valves in them so water will not drain out. If you go with the fist way that I mentioned, there is a few more steps than just adding more pumps and getting rid of the sprinkler valves. I have pictures of my install in my profile if you like to take a peak.
TazzTazz 07' Moomba LSV --Kicker Marine Amps (MX700.5 & MX350.4) 6 polk DB651 speakers, 4 MB Quartz Marine Speakers, 10" Boston Acoustic Sub, Z-5 Cargo Rack, Custom Speaker/Light Bar, modified ballast system, Custom LED Rings
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12-14-2009, 03:54 PM #12
Tazz, I think Jester already did this upgrade. It was a march 09 post that pmoomba ask a question to bring it forward.A Day at the Lake...Priceless
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2012 Möbius XLV~ Loaded & Exiled
2007 Outback V ~ sold
12-15-2009, 02:04 AM #13
See the pic below of the GIII system manifold in my boat. These are just lawn sprinkler valves and plastic pipe and fittings you can buy at home depot. Your current single fill pump will feed into this this manifold. You will need to buy one aerator evac pump for each sac you add. You will also need to drill two holes above water line for the evac line (just buy the correct size hole saw, tape the gel coat with masking tape, then drill the hole in reverse), one for each sac, just like the one you have now for the one sac (so each sac will have it's own evac pump, hose, and thru hull fitting above water line. You will also have to buy two more switches. You can get the fat sacs and fittings at places like buywake.com, wakeside.com, etc. I had mine converted by the dealer from GI to GIII before I took delivery. They charged me the factory upgrade price of $795.
Hope that helps.
Last edited by cab13367; 12-15-2009 at 02:07 AM.Al
2006 Mobius LSV
12-15-2009, 08:18 PM #14
AL, I can't believe you don't have a water strainer, or where did you hide it?09 21v LAUNCH
run your engine after you change your oil
68 th Member. WS420,HSE Revolution, OJ 466, Acme1157,1100 sacs,Kicker HLCD's n IX500.4, Supra Coolies
12-15-2009, 10:28 PM #15
Mine didn't come with one and I guess I didn't really think I needed it. But from what I have read lately, I've decided to add one. It's on my list for this winter.Al
2006 Mobius LSV
12-21-2009, 08:01 AM #16Senior Member
- Join Date
- Sep 2009
Anyone ever have this done at a dealer or another shop? I got my boat used so don't have a specific dealer, but called the only one that's near me and got a quote (on the order of $1k per side) that adds up to more than the full GIII option when purchasing a new boat. Based on what he was saying it sounded like the price came from SC. It would be 2 new intakes and 2 new pumps (among the rest of the work/equipment). I guess in some ways I can see how it could be more to make the changes to a completed boat vs. during the production process when it's more open, but that was still more than I would have expected.
I haven't written off doing it myself but am keeping options open. That would be an upgrade over what my plans would be (adding 2 bags to existing 1 intake/pump system), so there are some benefits (as well as some assurance of a good job vs. my inexperience), but I don't want to get taken either so was looking for some basis for comparison.
12-21-2009, 02:33 PM #17
As I mentioned in an earlier post, I paid $795 to go from GI to GIII. I had negotiated this into the sale price so I think he worked with me on the price. This is the same upgrade price had I ordered it new.
You have an '06 so I assume it uses the old style system, i.e., separate pumps for intake and evac. The GIII upgrade would include a manifold, two solenoid valves, two sacs, and two evac pumps (one for each added sac).
If you were told that they would be adding two intakes and two pumps, that leads me to believe that they are upgrading you using the new system - one reversible Jabsco pump and one intake per bag. Those pumps run around $200 each I think. You should call them back and tell them what system you currently have and what upgrade they plan to do. I guess it would be okay to mix and match the old and the new system.
Either way, you will save a lot of $$ doing it yourself if you are so inclined.
2006 Mobius LSV
12-25-2009, 09:58 PM #18Senior Member
- Join Date
- Jun 2008
- Eugene OR
jmvotto, I Have not done the upgrade yet at i did not want to break down the system in the Summer. Now for X-mas my family has gotten me two fat sacks so some time in the next two months i will be working on this project. I do not know if i will go with three Jabsco pumps or install two drain pumps and drill thru the haul.2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill
01-28-2010, 05:54 PM #19Senior Member
- Join Date
- Apr 2009
Either way you go the system will function just fine, but if you use Jabscos (or Johnson Ultra Ballasts) you'll have a system that fills quite a bit faster as each bag will have it's own dedicated fill pump instead of sharing the common factory fill pump.
If you want to do it as inexpensively as possible add additional sprinkler valves and individual drain pumps. If you want to increase the speed of the system at the same time, go with the impeller pumps.WakeMAKERS | WakePROPS | WakeSOUNDS | EasyBoatCare