98 290DA tab upgrade

Discussion in 'Bennett Trim Tabs Vendor Forum' started by Strecker25, Oct 9, 2016.

  1. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Tabman, our 98 290 has twin 5.7EFIs with alphas. The stock tabs leave a lot to be desired in terms of low speed planing. With full tab I still need about 26mph to stay on step. Can you help ide tidy some options to upgrade? I'd like to keep the same actuators and just put a larger tab on if possible. I can take measurements if need be. Let me know. Thanks.
     
  2. Tabman

    Tabman Member

    676
    Jan 11, 2007
    The Tab Cave
    boatless
    boatless
    Ryan,

    Measurements and pictures would be great! We can see what we might be able to do once I see them.

    Tom
    Bennett Marine
     
  3. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Thanks Tom, I'll grab them tomorrow.
     
  4. Tabman

    Tabman Member

    676
    Jan 11, 2007
    The Tab Cave
    boatless
    boatless
    Very good, standing by!

    Tom
    Bennett Marine
     
  5. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Ryan, there might be something else going on that is requiring you to have to go so fast to be on plane. Possibly the drives are trimmed too far up? I'm not saying don't put bigger tabs on - rarely, if ever, is this a bad idea. But the last time I ran a 290DA I don't recall having to run that fast. In fact, I don't recall running any Sea Ray that fast to be on plane. Just a thought. Now, I could be wrong - but maybe check with other 290DA owner's and see what their experience is. Has it always been this way (clean bottom)?
     
  6. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Thanks Dennis, now that you mention it I would actually say technically I'm on a plane around 24mph which is about 3100 rpm. The attitude of the boat at that speed is not the best though, and she really levels out once I get it closer to 32-3400. This is our second year with her, but it's the same from the day she is launched clean

    other owners report very similar results in their 290, especially with 350's and the genset on board. I typically have the drives fully tucked
     
  7. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
  8. Tabman

    Tabman Member

    676
    Jan 11, 2007
    The Tab Cave
    boatless
    boatless
    That is a custom Tab we made for SeaRay. Looks like you are really limited in adding span (side to side) as the deadrise angle changes right after the lifting strake.

    The easiest thing to try is to add a set of DF12 Drop Fins.

    The 3" fins capture water pressure that is normally lost out the side and channels it aft to increase lift.
    [​IMG]

    [​IMG]

    The part number for the kit (will do two tabs) is DF12.

    Tom
    Bennett Marine
     
  9. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Excellent, I figured we were limited as to what we could do given the transom design. I'll give the DF12 a shot, I see defender has them listed. Unless there is another re seller you would recommend?
     
  10. Tabman

    Tabman Member

    676
    Jan 11, 2007
    The Tab Cave
    boatless
    boatless
    I really can't recommend dealers. But the Lance family who own defenders are old friends, so if they list it I would go there! :)

    Tom
     
  11. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    You know, now that I think of it, Ryan, the last 290DA (of your model era) had 5.0's (MPI's, though) and a genny, but it also had the Bravo 3 drives. That might be why I'm remembering being able to stay on plane a little slower. But probably not much more-so than the 24. It certainly wasn't under 20. The 26 just struck me as high.

    Looks like Tom is taking care of you... like he always does! Good luck with the fins - I've never experienced them but I've heard from others who have and they've been pleased with the results. You might also think about experimenting with 4-blade props.
     
  12. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Others have reported great results with the 4 blades on these boats, specifically around the quicker planing and lower planing speeds. That might be next for us.
     
  13. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Thanks, now just have to wait until April!
     
  14. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Hi Tom, I have our extensions ready to install and it looks like they'll fit nicely. What hardware would you recommend attaching them with? Initially I figured SS screws/lockwashers but saw the local WM has brass hardware as well. Probably doesn't matter much, just curious.
     
  15. BillK2632

    BillK2632 Well-Known Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    My 290 was a 2000, 5.0's BIII's generator - I never felt like I needed tabs to get on / stay on plane. I mainly used them to level out the ride.
     
  16. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    We don't necessarily have issues getting up on plane if I mat the throttles, but the speed at which I have to go to maintain a plane even with tabs full down is pretty high. Since the extensions are so cheap I figured I'll try them first and maybe try 4 blade props at some point this summer. We're alphas so not quite as much lift, either.
     

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