04–07 390/400 Sundance

Discussion in 'General Discussion' started by see ray, Feb 12, 2018.

  1. see ray

    see ray Member

    Sep 28, 2008
    Sandusky ohio
    8.1L Mercs
    V Drives
    Hi I'm moving up from a 05 340 DA , WHAT A GREAT BOAT . Fenomimal
    In every aspect of operation, never used the tabs to get on plane.wanting to move to a 390/400 DA
    I'm now looking/ interested in a 04 and up 390/40 DA , GAS !!
    Question, 8.1L 370 hp. VS. 8.1 L HO 420 hp

    How does the boat run/handle Mostly planing ? Speed top end doesn't matter

    I know diesels have more torque, but the maintenance and fuel saving does not apply to me, any thoughts/experiences real life , would be helpful
    My gut say go with the 420 hp only ,( the more hp the better ) but there Seems to be more of 370 hp boats out there then the 420 hp b
  2. Ididntdoit

    Ididntdoit Well-Known Member

    Dec 5, 2007
    East Coast Florida
    300 Sundancer
    5.0MPI Bravo III
    Look at the torque curve NOT the total HP.......I suspect the curves are very similar......my guess is the HO's will give you a little more top end speed....
    Great Lakes likes this.
  3. Great Lakes

    Great Lakes Active Member SILVER Sponsor

    Oct 11, 2016
    MacRay Harbor (Michigan)
    2005 390 Sundancer, GHS Swim Platform, Bow/Stern Thrusters, Tracvision, Twin E120 w/ Autopilot
    We have absolutely no issues with the gassers. Does it drink the fuel, sure but not anything we can’t handle. Runs great even with jetski on platform.

    That is correct, the power curve is only for top end which to me is kinda pointless on this size boat.

    When we purchased ours, there was only one 390 diesel available and it was stripped of other options and a salt boat. I was hesitant to pick up gasser but I wasn’t willing to pay $30-$40k more for one year newer 40da with diesels.

    You won’t be disappointed
  4. Siboatguy

    Siboatguy Member

    Mar 28, 2016
    2005 Sea Ray 320 Sundancer
    Twins V-Drives
    2017 5.7 Mercruisers
    Gonna follow this form.... If you don't mind me asking whats ur cruise speed with the gas? How far can you go on 1 tank and how much do you hold?? sry for all the questions.... We love to travel and debating on diesel and gas now... Prob gonna make a move mid season...
  5. bmac

    bmac Active Member

    Jan 11, 2008
    Holbrook, NY
    2006 58 Sedan Bridge, Walker Bay Generation 390 RIB w/40hp Yamaha, 2014 Wellcraft 232 CC w/Yamaha
    MAN 900 CRM
    I bought a 2006 40DA new. We originally ordered it with the QSB 380 Diesels (with a $55,000 additional price tag). After thinking about the way we used the boat (lots of local travel plus one or two trips a season of about 100 nm each way) I changed the order to the 8.1 HO gassers. If I recall, cruise was around 21 knots burning 40 gph. I never had an issue with close quarters handling, though I did have a bow thruster and used it when necessary. Unless you're doing longer range cruising or find a good deal on a diesel boat, there's nothing wrong with gassers in this model. I'm sure the purists aboard here will vehemently differ on this point but that's my observation and I've actually owned one, not just read about it. You can take that for what you will.
    Siboatguy and Fred like this.
  6. Robski97

    Robski97 Active Member PLATINUM Sponsor

    Jan 15, 2007
    North Bellmore, NY
    Cummins QSC 8.3's
    : ) id have loved to have seen that gasser go to block !!! just saying ...



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