** Quick swtd Question **
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** Quick swtd Question **

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    Senior Member stallion176's Avatar
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    Default ** Quick swtd Question **

    I have been reading up on the latest swtd thread and you guys are amazing.. This is my first swtd and have had it out all summer. Now my question.. This is a 550hp bbc with b impeller, loader, droop, hyd diverter and the ride plate that bolts on.. im getting only 82 mph on gps. is this ride plate combo i bought junk? what would be some good starting degree points for my tabs? Watch it in HI -RES Heres a wide open run... pause it as it go's by
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    Last edited by stallion176; 11-13-2008 at 10:57 AM.

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    Senior Member bp298's Avatar
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    looks like a standard place droop with bolt-on ride plate. dunno that it's junk, but dunno what you were expecting from it? is the plate angle setting adjustable, or is it just fixed in one position on the droop? i keep my tunnel plates at 0 degrees, compared to tunnel angle. some guys like to move them up 1 or 2 degrees, but if you cannot move the ride plate, don't know if that would do anything for you.

    ideally, you'd have an intake that is machined for a shoe/rideplate combination, which gives you more tuning options. your boat is "tight" as it passes the camera, meaning it's too deep in the water, which adds drag. without a shoe, or some adjustability of the ride plate, there's little more to do other than keep playing with the diverter. you can go nutz like some of us have, or just have fun and keep playing with it...
    also, it's hard to tell, but it looks like the nozzle isn't machined for inserts???

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    Glendale Arizona Squirtcha?'s Avatar
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    Talking

    I'm certainly no SWTD expert, but I have played around with the PD droop and fixed rideplate. Although it has some adjustability, it's pretty limited. Also not a great transition from intake/transom/plate.

    A buddy of mine and I both experimented with the PD plate and other than it helping the boat to get on plane quicker, really found no benefit to it. We both ended up having our intakes removed, machined, and setback for "the real deal" shoe/rideplate. Lots more adustment and not a compromise like the PD unit. You won't have to worry about a setback of course.

    82 mph with 550 hp is doing pretty well and with some hardware/setup there's probably more in it.

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    Senior Member stallion176's Avatar
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    Quote Originally Posted by bp298 View Post
    looks like a standard place droop with bolt-on ride plate. dunno that it's junk, but dunno what you were expecting from it? is the plate angle setting adjustable, or is it just fixed in one position on the droop?
    it is adjustable but im not sure the limit on it... i can try and check with Jet Boat Perf and see what they say..

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    TRG
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    ...for what its worth, ya might wanna take a little more time gettin out of it!
    The more dialed you get the boat shutting down like that might turn into a handfull.
    But then again. i have no idea how the SWTD shuts down, being that its a Mod V hull.
    Todd
    Looked safe though.

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    Senior Member stallion176's Avatar
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    ok before i change any of this i want to document my current settings and my current GPS reading. Correct me if wrong please.

    1. get boat on level slab, place level on sponson and get boat level on bottom, place angle finder on ride plates and record readings.. right? better way? thanks guys

  9. #7
    Senior Member bp298's Avatar
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    Quote Originally Posted by toddnjuzz View Post
    ...for what its worth, ya might wanna take a little more time gettin out of it!
    The more dialed you get the boat shutting down like that might turn into a handfull.
    But then again. i have no idea how the SWTD shuts down, being that its a Mod V hull.
    Todd
    Looked safe though.
    aahhh, piece 0 cake todd... and losin' power at 105 is no problem, if yer hangin on really really tight

    Quote Originally Posted by stallion176

    it is adjustable but im not sure the limit on it... i can try and check with Jet Boat Perf and see what they say.. .
    the reason i ask is that one of the things i'll do when i want to loosen my boat up a little more, is to lower thrust centerline. i do that by wedging the droop down, and adjusting nozzle angle with the pd. but, my plate isn't attached to the droop, it's attached to the bowl, so i don't have to mess with it.
    that plate -should- be angled up 2-4 degrees, compared to the flat spot on the keel, next to the intake. if you can't manipulate the plate angle, or raise/lower the thing, then forget what i said about changing thrust centerline.
    like dan said, you are very limited. to get more out of the hull, getting the intake machined for a shoe/ride plate will definately make a difference. but, even with that, you may only pick up a few mph - but, it'll be a whole lot quicker getting there. the other thing you could do is spend a whole crapload more money on the engine - but even if you do that, the hardware is still holding you back.

    just like nascar (where is warp speed?) loose is fast, tight is slow... too loose is a crash looking for a place to happen...

    what about that nozzle? is it machined for inserts???

  10. #8
    Senior Member stallion176's Avatar
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    no nozzle inserts for me... So if i was to put my r/p up to say 5-6 up would that get more of the boat outta the water.. at wfo the boat is very tight and stable... i can keep going up on the div but theres a point where it creates to much drag and looses mph.. i need the rear of the boat up more. how do i achieve that? thrust centerline adj?

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    Senior Member Futs's Avatar
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    Where are the air plates at ? level with the tunnels? I would venture to say (just my opinion) that you are pretty well tapped out for that combo. Yank the intake and have it machined for a shoe and ride plate. You will thank yourself next summer.

    Damn, these swtd are popping up all over the place this last year!!!

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    Senior Member wajetboy's Avatar
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    i agree with machining for a shoe and rideplate.
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

  13. #11
    Senior Member bp298's Avatar
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    Quote Originally Posted by stallion176 View Post
    no nozzle inserts for me... So if i was to put my r/p up to say 5-6 up would that get more of the boat outta the water.. at wfo the boat is very tight and stable... i can keep going up on the div but theres a point where it creates to much drag and looses mph.. i need the rear of the boat up more. how do i achieve that? thrust centerline adj?
    moving the plate up isn't necessarily going to get the boat much further out of the water, but it may allow a little more attitude - the issue with more attitude is that it will drive the azz further into the water, so it's a balancing act.
    there are a couple ways to get the keel up a bit more with the same hp/pump you have now, but they both involve machining the intake for a shoe/ride plate. which means the ride plate you have on there now would end up in the pile. this takes some effort, but at least you'll have something to work with.

    nozzle inserts can make a good difference when considering the cost of machining the nozzle. pd nozzles are not necessarily round, and they're generally too big in diameter. get it machined for ftn inserts, and try some different sizes.

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    Senior Member stallion176's Avatar
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    isnt removing and replacing the intake pretty critical? im mechanically inclined but ive always heard that placing the intake back in was veeeerryyy critical.. wrong right? DIY??

  15. #13
    Boat Nut sleekcrafter's Avatar
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    Hard to reset an intake no..... tedious yes..... The whole process needs to be planned out in advance, four leveling screws are used to position your intake prior to final setting it in epoxy.

  16. #14
    Boat Nut sleekcrafter's Avatar
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    Check the bottom of your keel, most all the SW tunnel bottoms, have a bad hook about 5-7 feet in front of the pump. This is not so bad for a v hull, but more of the center pod is in the water, on the mod v tunnels, causing a wetter ride.

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