Official 390DA Thread

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Can anyone recommend a shop that can build a custom bimini top and aft enclosure for 2005 sea ray 390 for around 3 to 4K? Quotes I'm getting here in PNW are around 7 to 9k which is insane to me. I know some of you are ok with paying that much. I would really appreciate the reference.

Here is an example of what I'm looking for :
 

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Gioia sales. They are an east coast based company but they built these enclosure for sea Ray in Melbourne, fl before the pant close down. I used them myself.
 
I recently had the opportunity to run a 390 with 5.9’s and the boat seemed slower than I expected it to be. I’m wondering if maybe there was an issue, or perhaps thats how they preform.

IIRC she was turning 2,500-2,600 RPM to achieve 21 knots. The boat had about 1/4 tank of fuel, maybe 1/2 tank of water, and no provisions, we were traveling lighter than I’d normally travel. The boat had a hydraulic platform with a dink on it, not sure if that would make much of a difference though, as those 5.9’s do make plenty of power. I was expecting this to be able to cruse around 22-23 knots and closer to 2,100-2,250 RPM while burning around 30 gph. Are my expectations off?

Could any of you 04-05 390 owners with 5.9’s offer some speed/ RPM/GPH numbers.
 
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I recently had the opportunity to run a 390 with 5.9’s and the boat seemed slower than I expected it to be. I’m wondering if maybe there was an issue, or perhaps thats how they preform.

IIRC she was turning 2,500-2,600 RPM to achieve 21 knots. The boat had about 1/4 tank of fuel, maybe 1/2 tank of water, and no provisions, we were traveling lighter than I’d normally travel. The boat had a hydraulic platform with a dink on it, not sure if that would make much of a difference though, as those 5.9’s do make plenty of power. I was expecting this to be able to cruse around 22-23 knots and closer to 2,100-2,250 RPM while burning around 30 gph. Are my expectations off?

Could any of you 04-05 390 owners with 5.9’s offer some speed/ RPM/GPH numbers.

Hello, your numbers are off but not by much. 2,600 RPM is 80% of the load which should be your normal cruising setting. The boat is under powered but as light as you were you should be doing 23-24 kts.... I get 22 kts at 2600 RPM with 90% tanks and full water plus the wife's provisions.... burning 28 GPH! maybe is a prop issue or your bottom is dirty.

2100-2250 RPM is way too low for these engines to give you the speed you want. Underpowered...2500-2600RPM is what you want.
 
Hello, your numbers are off but not by much. 2,600 RPM is 80% of the load which should be your normal cruising setting. The boat is under powered but as light as you were you should be doing 23-24 kts.... I get 22 kts at 2600 RPM with 90% tanks and full water plus the wife's provisions.... burning 28 GPH! maybe is a prop issue or your bottom is dirty.

2100-2250 RPM is way too low for these engines to give you the speed you want. Underpowered...2500-2600RPM is what you want.
Hey FD.

My props come off tomorrow for the prop shop. Ive been working with Cummins and my local prop shop to get the fuel burn right. With the same QSB's, but 425's, I was burning 14.5-15.5 per side when the fuel curve indicates closer to 11. Granted these aren't new boats and the bottoms aren't perfectly clean but 2400rpm and 14.5/per side will long term wear the engine. Cummins suggest removing 1.5 inches of pitch and that will bring the fuel numbers in line but run the boat at 2600rpm instead of 2400.
 
Yes 2600 RPM is definitely the sweet spot. The boat likes it and you can run it there all day long!
 
Hello, your numbers are off but not by much. 2,600 RPM is 80% of the load which should be your normal cruising setting. The boat is under powered but as light as you were you should be doing 23-24 kts.... I get 22 kts at 2600 RPM with 90% tanks and full water plus the wife's provisions.... burning 28 GPH! maybe is a prop issue or your bottom is dirty.

2100-2250 RPM is way too low for these engines to give you the speed you want. Underpowered...2500-2600RPM is what you want.

You are over propped if you are burning 28 gph at 2600 rpm. The Cummins fuel curve is 12.7 per engine at 2600 rpm.
I had a 2005 40 with 380's and had to reduce the pitch to get the correct fuel burn. I also ran 2700 rpm which is 90%
of max rpm which is where Cummins rated them for pleasure use. Loaded for trips the boat ran 26-28 mph and close to 1 mpg.
Fully loaded you should get a max rpm of 3065 which is where they are governed. As you stated in an earlier post 2100-2200 rpm is too slow for this boat and may actually be hard on these engines as the boat is not over the hump.
 
You are over propped if you are burning 28 gph at 2600 rpm. The Cummins fuel curve is 12.7 per engine at 2600 rpm.
I had a 2005 40 with 380's and had to reduce the pitch to get the correct fuel burn. I also ran 2700 rpm which is 90%
of max rpm which is where Cummins rated them for pleasure use. Loaded for trips the boat ran 26-28 mph and close to 1 mpg.
Fully loaded you should get a max rpm of 3065 which is where they are governed. As you stated in an earlier post 2100-2200 rpm is too slow for this boat and may actually be hard on these engines as the boat is not over the hump.
Dang Bec.

A 40 isn't going that fast.
 
I travel with one at 26 mph all the time. Once you get it propped correctly you can use the HP the Cummins engineers provide for.
 
Phasma,
Thank you for your response, we have heard about the Hurley H3. It sounds like we would need the extension package so it would cantilever over the edge of the swim platform for us to be able to use the middle transom door. I wonder if anyone out there has this application?
Did you end up adding the extension to the H3O? I'm thinking of adding this to my 2006 380. Any help / pics you could provide would be great. Thanks
 
Can anyone tell me the size of the MFD panel, the one to the left as well as the center panel where the gauges are. (inner edge to inner edge).
 
Are you replacing the E120? I added two 12” axioms and I needed to have a bezel made to fill the gap.

I am looking at purchasing an 05 390 and if I get it, I would like to replace the electronics.

The boat I am looking at has a working E120 (in the left panel) and the original analog radar up top, so the radar and E-120 don't communicate. The center dash has an older Garmin unit (might be 7212, iirc). Ultimately, I would like to replace both units with newer 12" Garmin units and but want to confirm there is enough room for a 12". I am assuming there might be enough room for a 16" in the center dash between the gauges.

Rich, could I see a picture of your setup and the panel you put in.
 
I am looking at purchasing an 05 390 and if I get it, I would like to replace the electronics.

The boat I am looking at has a working E120 (in the left panel) and the original analog radar up top, so the radar and E-120 don't communicate. The center dash has an older Garmin unit (might be 7212, iirc). Ultimately, I would like to replace both units with newer 12" Garmin units and but want to confirm there is enough room for a 12". I am assuming there might be enough room for a 16" in the center dash between the gauges.

Rich, could I see a picture of your setup and the panel you put in.
I just realized I don’t have one single pic of my dash. I changed over all my electronics two years ago. Gutted everything and started fresh. I’m heading to the boat tomorrow actually so I’ll grab a few pics

btw, if you have any questions regarding garmin you need to talk to (Seth) @rollercoaster on here. I have Raymarine...

I’ll touch back tomorrow with pics
 
I just realized I don’t have one single pic of my dash. I changed over all my electronics two years ago. Gutted everything and started fresh. I’m heading to the boat tomorrow actually so I’ll grab a few pics

btw, if you have any questions regarding garmin you need to talk to (Seth) @rollercoaster on here. I have Raymarine...

I’ll touch back tomorrow with pics

Thank you Rich. Looking forward to seeing your setup.

I plan to have the boat surveyed, next Friday. I’m hoping nothing major comes up. However, I have a mild concern about the bilge compartments in the cabin having evidence of water in them at some point. This in itself isn’t overly concerning, however what was concerning was the epoxy seemed to be delaminating, or flaking off the fiberglass. This was the case in the 2 center compartments, the rear compartment, and it was also in the anchor locker too. I know leaky windows, deck fittings, even shower lines or ac lines can lead to water in the center bilge. However, none of these would explain the epoxy delaminating in the anchor locker.

I’ll make sure the surveyor looks for any evidence of a sinking or structural repairs. But maybe this is a function of bad epoxy from the factory and nothing more.
 

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Gelcoat peeling off... Not necessarily the fiberglass. My guess is due to age, heat, etc. I have that problem on anchor locker and engine room bilge. not on interior bilge.
 
Gelcoat peeling off... Not necessarily the fiberglass. My guess is due to age, heat, etc. I have that problem on anchor locker and engine room bilge. not on interior bilge.

I would agree there's a correlation with age, temperature, and humidity conditions. Especially since some parts of the interior are showing moisture issues. The right side of the mirror frame and the table, look to be impacted.
 

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