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  1. #1
    Platinum Member BigSteve's Avatar
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    Default EFI experts

    Looking for your advice

    Putting together a Mercury 2.5 liter drag motor on my 19 DCB/Daytona
    like to run 9's


    We will be spinning it 10,000-10,500 RPM with NOS/ Meth

    I have a pair of bosch fuel pumps , I'am thinking about running 2 pumps in parallel each with a one way check valve in the output lines.

    I will start it on one pump and race with both.

    I was also thinking of using a oil accumulator tank to even out the fuel pressure at the rail approx 56#s

    Any suggestions welcome

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  3. #2
    gn7
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    Your Outboard Church faithful failing you Steve? You have to haul this kind of filth into the dyno forums? Is this going to be a Div II boat?



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  4. #3
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by gn7 View Post
    Your Outboard Church faithful failing you Steve? You have to haul this kind of filth into the dyno forums? Is this going to be a Div II boat?
    I have a lot of respect for you guys

    This boat is our play toy

    No, its not a div II boat
    The rules get in the way
    Banned for
    1,To much compression
    2. Race gas only motor
    3.NOS/ meth power adder
    4. XR-6 gear case
    5. gearcase height
    6. weight
    I must be doing something right

    I enjoyed endurance racing, but, the rules make me sick
    fuck the bone stock green motor rules

    I want to go and have a little cove racer, and some fun accelerating a 1,000 ft or
    1/4 mile

    In the end I boat for myself

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  6. #4
    Senior Member ap67et10's Avatar
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    There is no reason you can't run them both at the same time all the time. This saves you from running check valves. Just run a good regulator that can flow capacity for both pumps at max flow. If you wanted or needed you can run 3 or 4 pumps in parallel if you want. I've seen it many times.

    Andrew

  7. #5
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by ap67et10 View Post
    There is no reason you can't run them both at the same time all the time. This saves you from running check valves. Just run a good regulator that can flow capacity for both pumps at max flow. If you wanted or needed you can run 3 or 4 pumps in parallel if you want. I've seen it many times.

    Andrew
    Thanks,
    I would like to save the expense of 2 one way check valves.
    My only problem is I run a alternator elimination set up
    and the stator only puts out 16 amps @ rpm
    So I would like to run up to the line on 1 pump

    I will have 3 pumps running while making a pass
    2 for the EFI and 1 for nos /meth
    That should be good for 3 hp/per cube

    Have you ever seen anybody run a accumulator pressure tank on the fuel rail ?
    Death comes fast to a lean 2 stroke, is my biggest worry

  8. #6
    mo balls than $cents$ IMPATIENT 1's Avatar
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    As long as the pumps have a large filter in frt of them with some storage capacity in those then whats the worry with being lean if the pumps are up to the task? By in frt i mean prefilters with some reserve to em if that makes sense.i run 27psi at wfo and jus run a big barry grant filter with about a 3/4qt capacity in frt of my prostar 500 pump and have rock stead Pressure that way.never dips and recovers cuz the prefilter holds so much reserve rigt at the pump plus whats in the bowls(carbd).kinda like having large capacity fuel rails on a efi motor same principal anyways..im a true believer in overdoing a fuel system when power adders are involved.what pressure is in the after pump filter i consider accumulation is your terms cuz its storing a reserve at pressure.have a steady 11.6-11.7 thruout my boost range of 0-18.5lbs boost

    Dare to be different, if it turns out great you can claim you planned it that way.

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  9. #7
    Senior Member bp298's Avatar
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    Quote Originally Posted by BigSteve View Post
    Thanks,
    I would like to save the expense of 2 one way check valves.
    My only problem is I run a alternator elimination set up
    and the stator only puts out 16 amps @ rpm
    So I would like to run up to the line on 1 pump

    I will have 3 pumps running while making a pass
    2 for the EFI and 1 for nos /meth
    That should be good for 3 hp/per cube

    Have you ever seen anybody run a accumulator pressure tank on the fuel rail ?
    Death comes fast to a lean 2 stroke, is my biggest worry
    steve, not quite getting why you would run 2 pumps like this? why not one pump that's sized to your satisfaction? not a big fan of check valves applied this way. if one pump is making more pressure than the other, could result in flow restriction from the other pump. if you could separate them to the point check valves aren't needed, or they're feeding the deal independently, different story. personally, if it's not in series (like one boosting the other), i'd prefer 1 pump.
    completely agree with a separate pump for n2. although don't know how you're planning to plumb to engine...

  10. #8
    Senior Member STV_Keith's Avatar
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    A single Bosch 981 drag pump will support all the HP the engine will make N/A. I'm sure you'll have your own pump for the meth. Contact Chuck Goodman of Nitrox for any other N2O O/B questions.

    I've run a lot of nitrous in my day, but not on an O/B specifically. It's all basics though really.
    Keith-


  11. #9
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    As long as the pumps have a large filter in frt of them with some storage capacity in those then whats the worry with being lean if the pumps are up to the task? By in frt i mean prefilters with some reserve to em if that makes sense.i run 27psi at wfo and jus run a big barry grant filter with about a 3/4qt capacity in frt of my prostar 500 pump and have rock stead Pressure that way.never dips and recovers cuz the prefilter holds so much reserve rigt at the pump plus whats in the bowls(carbd).kinda like having large capacity fuel rails on a efi motor same principal anyways..im a true believer in overdoing a fuel system when power adders are involved.what pressure is in the after pump filter i consider accumulation is your terms cuz its storing a reserve at pressure.have a steady 11.6-11.7 thruout my boost range of 0-18.5lbs boost
    I will look into that Barry Grant filter assy

    Right now i'am running a Kinsler monster mesh filter before the pump and a second filter before the fuel rail

  12. #10
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by bp298 View Post
    steve, not quite getting why you would run 2 pumps like this? why not one pump that's sized to your satisfaction? not a big fan of check valves applied this way. if one pump is making more pressure than the other, could result in flow restriction from the other pump. if you could separate them to the point check valves aren't needed, or they're feeding the deal independently, different story. personally, if it's not in series (like one boosting the other), i'd prefer 1 pump.
    completely agree with a separate pump for n2. although don't know how you're planning to plumb to engine...
    I would like to end up with a single weldon fuel pump, like the way Kevin Kraft (Stoker 2001) set it up


    I have a couple Bosch EFI fuel pumps ( old school) run a pair of them for hi RPM drag set ups.

    The only advantage I can see is each pump is feed by a 8 AN line from the bottom of the 3 gal fuel tank
    Last edited by BigSteve; 06-06-2013 at 05:01 PM.

  13. #11
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by STV_Keith View Post
    A single Bosch 981 drag pump will support all the HP the engine will make N/A. I'm sure you'll have your own pump for the meth. Contact Chuck Goodman of Nitrox for any other N2O O/B questions.

    I've run a lot of nitrous in my day, but not on an O/B specifically. It's all basics though really.
    Yes, we will use Chuck at Nitrox, worked with him before great guy

    Its a nice set up with a tank fuel pump and 3 way valve to purge the meth out of the system when all
    done for the day
    I will have my Jay Smith racing intake spacer modified for the NOS fuel tubes and flow tested

    Plus the module runs the meth/oil side a couple seconds longer after the NOS is shut off for a cool down period

  14. #12
    Senior Member stoker2001's Avatar
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    Quote Originally Posted by STV_Keith View Post
    A single Bosch 981 drag pump will support all the HP the engine will make N/A. I'm sure you'll have your own pump for the meth. Contact Chuck Goodman of Nitrox for any other N2O O/B questions.

    I've run a lot of nitrous in my day, but not on an O/B specifically. It's all basics though really.
    IMO the single 981 bosch can get it done,but you better be flooding the input side with huge low restricted line/fittings and filterswe are talking a drag 2.5 Merc motor here at 10K plus RPMs need stupid amounts of fuel..
    The twin/parrallel pumps is old school,but is sponsered by diamond marine in Florida and Joe and Marty know how to get it done
    Whacker Smacker M/E #561 IHBA "first looser"champ 2006&2007&Sportsman Driver of the Year

  15. #13
    Senior Member STV_Keith's Avatar
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    Quote Originally Posted by stoker2001 View Post
    IMO the single 981 bosch can get it done,but you better be flooding the input side with huge low restricted line/fittings and filterswe are talking a drag 2.5 Merc motor here at 10K plus RPMs need stupid amounts of fuel..
    The twin/parrallel pumps is old school,but is sponsered by diamond marine in Florida and Joe and Marty know how to get it done
    Better get the big charging system...IIRC, the 981 pumps pull 9 amps each?
    Keith-


  16. #14
    Senior Member stoker2001's Avatar
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    Quote Originally Posted by STV_Keith View Post
    Better get the big charging system...IIRC, the 981 pumps pull 9 amps each?
    Steve was gonna use two of the 260/280HP pumps which are a little less thirsty,but get your point
    Whacker Smacker M/E #561 IHBA "first looser"champ 2006&2007&Sportsman Driver of the Year

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