is pump setback necessary to go fast.
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is pump setback necessary to go fast.

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    Default is pump setback necessary to go fast.

    i seem to see alot of boats with setback pumps and rideplates/shoes. i was curious if this needs to be done on my boat . currently my pump is in the stock location. i have an 17ft v bottom that i will be doing some bottom work on this winter. my boat seems to porpoise alot at higher speeds. i have a droop and diverter currently with no ride plate yet. my bottom seems to have alot of hook in in, is this the cause of my porpoise problem or is this caused by something else? would a ride plate off the transom be helpfull. most faster boats i see are setback. anyone have a non setback pump and running without porpoise issues. thanks for any help on subject.

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    " Live Laterally " Dominator's Avatar
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    You will want a ride plate and some keel. Setting back the pump gets it in the water further as far as I know. Any fast jet I have ever had has had all the above. Im just sayin. Im sure I will be corrected if wrong.
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    Quote Originally Posted by Dominator View Post
    You will want a ride plate and some keel. Setting back the pump gets it in the water further as far as I know. Any fast jet I have ever had has had all the above. Im just sayin. Im sure I will be corrected if wrong.
    not too shure what keel is, can you explain?

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    Senior Member moneysucker's Avatar
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    I will say from experience that bottom work is better off left to the pros if you are in the vicinity of one of the good ones. Some boats need hook, some don't, some have rocker, some need to add a keep or spoon to load harder, some need some ground out to load less becaust the power is not there to push the water entering the pump. There are a lot of variables and I would say that the first thing you want to do is get a ride pate to try to allleviate the hop. The droop may be making it worse by geting more lift in the rear of the boat causing the boats bow to rise and fall. where are you located? A board member may be ablet to help you assess the problem and point you in the right direction for you.

    Cy
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    Senior Member W.O.T's Avatar
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    Quote Originally Posted by moneysucker View Post
    I will say from experience that bottom work is better off left to the pros if you are in the vicinity of one of the good ones. Some boats need hook, some don't, some have rocker, some need to add a keep or spoon to load harder, some need some ground out to load less becaust the power is not there to push the water entering the pump. There are a lot of variables and I would say that the first thing you want to do is get a ride pate to try to allleviate the hop. The droop may be making it worse by geting more lift in the rear of the boat causing the boats bow to rise and fall. where are you located? A board member may be ablet to help you assess the problem and point you in the right direction for you.

    Cy
    Good info. My last boat 18ft Challenger V bottom ran better with the stock setup than a droop, diverter and loader. Had hook in the hull and porpoised at a cruising speed even with the diverter. Some boats are better off just left alone.

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    a am in the sacramento area. just upgraded to the split bowl and droop. always had porpoise issues even with the old pump. was not as bad before but i was going slower mph, seems to get worse the faster i go. there is alot of factors i did not know about, should i at least make sure the bottom is straight and level, my fiberglass work is pretty good.

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    Senior Member jetboatperformance's Avatar
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    No Brent , Not every hull design and bottom and and for that matter "set up" will neccesarily benefit or "like" a set back in fact that might "create" a huge nightmare for your self , more info and pics will help Welcome to the boards Tom

    FWIW we just finished a set back on a 17' Pantera (Tahiti-ish) with SBC the Boat "worked" Very well BTW the "keel" is .....http://en.wikipedia.org/wiki/Keel

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    Quote Originally Posted by jetboatperformance View Post
    No Brent , Not every hull design and bottom and and for that matter "set up" will neccesarily benefit or "like" a set back in fact that might "create" a huge nightmare for your self , more info and pics will help Welcome to the boards Tom

    FWIW we just finished a set back on a 17' Pantera (Tahiti-ish) with SBC the Boat "worked" Very well BTW the "keel" is .....http://en.wikipedia.org/wiki/Keel
    ill get some pics up asap, i too run a small chevy with gale banks twin turbo converted to blow thru carb. getting the transom plates to fit the pump is is important to me, the ones in the pic are nice. do you sell them or are they fabbed from scratch/ water leakage in this area seems to be an issue. thanks for the info so far, very helpfull. if i could get the boat to take a set and not hop so much then a setback may not be what i need. i feel there is alot left in the boat if it would ride ok at speed.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by brent b. View Post
    ill get some pics up asap, i too run a small chevy with gale banks twin turbo converted to blow thru carb. getting the transom plates to fit the pump is is important to me, the ones in the pic are nice. do you sell them or are they fabbed from scratch/ water leakage in this area seems to be an issue. thanks for the info so far, very helpfull. if i could get the boat to take a set and not hop so much then a setback may not be what i need. i feel there is alot left in the boat if it would ride ok at speed.
    Each set of plates are Fabbed to the particular boat Josh makes um fit right (no leaks) Happy to try to help ! Tom

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    Boat Nut sleekcrafter's Avatar
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    Set-backs are a good performance booster, gains vary by the hull. The pump benifits the most, being deeper in the water. Engine placement is the biggest game changer with the set back, many move the engine back to use the same driveline, some add a longer driveline, leaving the engine put. If you chose to move the engine back with the pump, theres a chance you will get a porpoise you can't over come.
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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    The pump benifits the most, being deeper in the water.
    not to mention getting your hand hole cover out side of your boat is awesome.. makes it very easy to just pull it open and check for obstructions. Other wise you better be very close to land or she might go down.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    Quote Originally Posted by Delemorte View Post
    not to mention getting your hand hole cover out side of your boat is awesome.. makes it very easy to just pull it open and check for obstructions. Other wise you better be very close to land or she might go down.
    also the added leverage, but I sure that's also what sleek meant.

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    Quote Originally Posted by brent b. View Post
    i seem to see alot of boats with setback pumps and rideplates/shoes. i was curious if this needs to be done on my boat . currently my pump is in the stock location. i have an 17ft v bottom that i will be doing some bottom work on this winter. my boat seems to porpoise alot at higher speeds. i have a droop and diverter currently with no ride plate yet. my bottom seems to have alot of hook in in, is this the cause of my porpoise problem or is this caused by something else? would a ride plate off the transom be helpfull. most faster boats i see are setback. anyone have a non setback pump and running without porpoise issues. thanks for any help on subject.
    I would say no, Yet reserve for the fact that you still have some part of the hull you can dry out even if its only 4-5 inches...

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