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Thread: Fuel consumption questions

  1. #1

    Fuel consumption questions

    We have a 2004 22v merc 350 in adult surf trim we have a total of 3000lbs of ballast and maybe 1000lbs of people and gear, Swell shaper.

    I swear my fuel consumption has doubled half way through the summer, I haven't done a detailed calculation this year but I am guessing we were doing 4-5 GPH beginning of summer and now I am guessing at 6-8 GPH.

    Doesn't smell like we are running rich, getting gas from same station, same speeds same lake, same etc etc.

    Plugs, cap and rotor issue?

  2. #2
    Join Date
    Sep 2012
    Location
    La Verne, CA
    Age
    40
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    1,091
    Boat
    2004 24V Riders Edition PCM ZR6 6L
    When did you add the swell shaper?
    Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

  3. Last year, add more wgt this year, understand all the wgt and the swell increases drag, all was good for a few months, just seems like one day it decided to drink a lot more gas.
    Might have to do with us getting better and surfing for 30 minute runs instead of idling every 5 minutes and spending time picking up riders.

  4. #4
    Join Date
    Sep 2012
    Location
    La Verne, CA
    Age
    40
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    1,091
    Boat
    2004 24V Riders Edition PCM ZR6 6L
    My consumption is always in the 4-5 range without a shaper. Shaper's you can see the RPMs jump a bit and generally hog the gas. I am not sure if its the more equal weighting or the drag from the shaper but its noticeable.
    Mods: MLA BIG Ballast System (1800+ Custom sacs, 2 500 W705 sacs under bow), Duffy Surf Flap Mod, Trimmed Swim Deck, Top-Mount Starter

  5. #5
    The more I think about it, consumption went up because people got better or least staying on the rope longer or free riding longer. I tried to go just with a list but the push just isn't there unless the shaper is on.

  6. #6
    Join Date
    Jan 2015
    Location
    Milwaukee, WI
    Posts
    91
    Boat
    2013 Tige RZ2
    The shaper kills the gas. Adds lots of resistance equaling higher rpm

    Sent from my SM-N950U1 using Tapatalk

  7. #7
    Join Date
    Sep 2010
    Location
    everson, wa
    Age
    39
    Posts
    9,508
    Boat
    08 22ve
    Smiles per gallon is how I measure fuel consumption

  8. #8
    Quote Originally Posted by Aspidaso View Post
    The more I think about it, consumption went up because people got better or least staying on the rope longer or free riding longer. I tried to go just with a list but the push just isn't there unless the shaper is on.
    Where do you have the gate? I've been playing around with a diy gate and struggling to find a good location. I feel like I need to remove the 22v sticker even when using the gate when listed. Have you changed your prop? When i have the gate under the sticker the stock prop struggles and just seems to low. As I move it forward i have had more success.

    Sent from my SM-G930V using Tapatalk

  9. #9
    Join Date
    Feb 2016
    Location
    Boise, ID
    Posts
    2,067
    Quote Originally Posted by lancehon View Post
    Smiles per gallon is how I measure fuel consumption
    ^^ this is the best take I've seen on this. Hope you dont mind me appropriating it.

  10. #10
    Join Date
    Jul 2010
    Posts
    4,152
    Boat
    2009 24Ve w/ AutoWake, Tablet Helm, and Ultra-Ballast; LOTS more technology in development!
    We refer to gasoline as "memories in liquid form". From lots of family experience, I can assure you that when you're elderly and in the nursing home, the currency of the realm is the stories you can share - not how much money you didn't spend when you were with friends and family. Don't go into debt, but also don't be afraid to burn more gasoline. Your whole family will be happier and closer, and that's way more important than money.

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