another loader/shoe question
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another loader/shoe question

  1. #1
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    Default another loader/shoe question

    Hi All


    im looking for a starting point for loader/shoe depth for a Rogers style bottom....


    Little background...


    1970 Weiman Cyclone
    Berkeley suction housing, Hardened shaft, billet inducer, Bronze Dominator BC impeller, Dominator bowl, American Turbine Droop, regular hydraulic diverter


    5.3L LS Engine, makes approx 500 hp NA (Dynoed at 450, but i changed out the heads from stock to trick flow's picked up 300 RPM from this change alone) So guessing 500-515 hp


    I have not measured how far the hardware is down below keel. But it is a drastic amount, i would guess atleast .250" . I will measure this weekend (im out of town for work)


    But i have the below pictured loader.


    When letting off the throttle on my boat, it feels like im dragging an anchor/pulling a parachute. the boat also feels sketchy as hell when on the throttle hard, kind of like a kite sensation... aired out but something holding it back.... fish on a line... hard to explain.


    im spinning the BC to 5400 on motor, and 64-6500 on a 150 shot of nitrous. According to my dyno sheet, these numbers are pretty close to the actual hp it is making at that rpm vs the impeller chart.


    it leaves pretty darn hard out of the hole, and just stops pulling... the boat gps's out to 77 on motor, and does it in a few seconds. im guessing 800 feet or less (havent done any real nitrous passes to gps)


    Kinda like having 4.10's in a car... pulls hard as hell then kind of flattens out...


    No i dont have psi taps or anything... The roost looks nice and solid.


    My theory is that i'm loading this thing to hard with the loader/shoe that low below keel. Hence the dragging parachute feeling...


    Will trimming/bringing my hardware up help? Could this be loading the impeller down so hard that its bringing engine RPM down too?


    I'm thinking to trim the loader back to even with the keel, and leave the shoe where it is but i know nothing about tuning this stuff
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  3. #2
    Senior Member ol guy's Avatar
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    Take 1/8 off the loader and leave everything else as is! One change at a time.

  4. #3
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    Quote Originally Posted by ol guy View Post
    Take 1/8 off the loader and leave everything else as is! One change at a time.
    Yeah i get that, change one thing at a time

    I guess im trying to ask, is what im experiencing a symptom of what i think the fix is?

    Am i going in the right direction?

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  6. #4
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Default

    It'll feel stuck to the water as you mentioned yes, id put the loader at 1/16th above keel and shoe depth 1/16th below for starting point, may need more off but that'll free up the boat alot. Had the same issue recently and my backcut was hanging .250 below😨 felt great on choppy water but felt like I was dragging anchor on smooth water. Pulled shims till I was just shoe to intake, still slightly below keel but it's a high hp gull-wing so it'll take some shoe without added keel to load it.

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

    Jetboatperformance.com

  7. #5
    Senior Member ol guy's Avatar
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    Quote Originally Posted by steves86ta View Post
    yeah i get that, change one thing at a time

    i guess im trying to ask, is what im experiencing a symptom of what i think the fix is?

    Am i going in the right direction?
    yes!

  8. #6
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    Default loader answer

    Try to find a GT boats loader, Ive used that SS loader before, had to dice up every which way, they seem to load the top of the impeller to much,shoot , had better luck with a modified rock grate, how much is the shoe creating lift, some guys told me a back cut shoe would never work on a delta pad bottom, but it worked awesome, the guy who helped me was an ex top fuel jet racer, just my 2 cents, if your still having problems let me know and I can give you his number, super nice guy

  9. #7
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    Default loader answer

    I used to go by the name eliminatorjocko on here about 10 years ago, so im not a junior menber lol had one of the fastest jets in norcal

  10. #8
    Senior Member bp298's Avatar
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    you really need to climb under the boat with a straight edge at least 4' long, and see what the depth relationship is between keel centerline, shoe biting edge, and the loader ramps.
    the shoe you have is seriously tapered (not back cut). from how thin the shoe looks at the biting edge, doubtful that it's below keel centerline, but you need to verify that.
    I do not like your loader, no matter how deep the ramps are with respect to keel centerline. I wouldn't have that thing within 20' of my boat, but that's just me. I've run loaders that made the boat feel like it was dragging an anchor, even though it didn't slow the boat any amount that was measurable. there are two measurements with respect to those ramps, both in relationship to the mounting pad. one is how far forward the ramps extend, the other is how deep they are from the mounting pad. cutting the ramps back can help depending on depth from the mounting pad. i.e., you could cut them back, but they're still hanging down the same distance from the pad. the second part is, cutting the ramps back starts to play with the structural integrity of the loader. and in your case, the structural integrity isn't all that great in the first place.

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