28 TD Daytona x dimension question?
 

I have a 28 TD 496 HO's with Bravo XZ drives, 5 blade 29p Hydros and no boxes. My propshafts are 1/2" to 1" above the lowest part of the inner sponsons. Then there's a 3" or so step-up and another foot of boat. I've noticed on a lot of the newer 28's the propshafts are even to 1" below the second or higher step with or without boxes.

I've been debating about adding the 12" IMCO boxes with 3" rise or just going with 2" IMCO shorties and no boxes. All in all to raise my x dimension 2". What would be the best route to take?

Hope this isn't to confusing? :D

Re: 28 TD Daytona x dimension question?
 

Call kenny at eliminator. I was just talking to him about the x on boats this week. very helpful.

Re: 28 TD Daytona x dimension question?
 

Harper...

1-2" above the bottom of sponson (drain plug part) is the ideal spot according to Eliminators riggers when I spoke with them....you can get them too high even with 5 blade props.

Re: 28 TD Daytona x dimension question?
 

for a singlr or twin?

Re: 28 TD Daytona x dimension question?
 

twin

Re: 28 TD Daytona x dimension question?
 

I talked with Kenny at Eliminator today for at least 20-25 mins. and he recommended 2" shorties and a Dana tab (mt1800). If 2" is too much I can always add a 1" spacer. I all ready run P5X's so that will help overall.

You mentioned the drain plug. That's about where my prop shafts are right now, so it's just a matter of dialing in 1" or 2" inches above that. The only part that sucks is the possibility of having to add a $2000 tab just to get on plane.

On the good side, there's a possibility of picking up 6-8 mph without touching the motors... :D

Re: 28 TD Daytona x dimension question?
 

what kind of 5 blade props are you running?

Re: 28 TD Daytona x dimension question?
 

They're Hydromotive P5X's 29p.

Re: 28 TD Daytona x dimension question?
 

A correction to post #6. I just went and looked and my shafts are 1" below the drain plugs, so I could easily go up 2".

Re: 28 TD Daytona x dimension question?
 

I think the neutral IMCO boxes drop your X a little. The 28s that I have put boxes on, we had to drop the front of the engine .75 to 1.0". Mine has solid mounts, so it required some drilling.

You also need to think about the prop pitch you are running. One inch up from the bottom and 36" bravos are tough to get on plane and almost impossible at the start of a poker run, even with a tab. Five blades are better, but if you are taking off in a poker run, it still can be tough. 34" bravos are OK and 32" bravos are no problem.

Another thing we found to keep from blowing out if using MSD distributors, is to lock the advance. That way you don't have one advancing ahead of the other and blowing one prop out and killing you. This can create other problems.

The best thing I did to keep from blowing out a prop on a start at a poker run was to install intercoms. I keep my ass in the seat and watch the tachs. My navigator stands for the first few seconds and tells me where to go and until we roll over. This also allows me to have my lap belt on before we take off.

Re: 28 TD Daytona x dimension question?
 

rbtnt, that sure sounds like too much work with the intercom and navigator to keep watch and you keeping an eye on tachs.

I run the P5X's now and wouldn't think about running 4 blade Bravo's again.

P5X benefits vs. Bravo I's
Absolutely no more problems rolling boat over, no more blow outs or pumping the throttles, 4 mph increase at 3500-3800 rpm, smoother and better throttle response, brings the nose down and maybe a 1-2 mph loss on top end, but who cares everything else more than makes up for the loss on top. I never run full throttle anyway.

I highly recommend you try the Hydros, seriously.

Re: 28 TD Daytona x dimension question?
 

The 5 blades seem to be causing some drive failures on the higher hp boats around here. I do want to try some P5Xs. I have a friend with P5s. He likes the midrange, but that is about it. Another friend can't keep drives together with Mercury 5 blades and 750hp. He runs idle or full throttle.

We have slowed down at poker runs with so many bigger boats now, we just pick a speed to to enjoy the ride.

We cruise a lot on river trips and the extra midrange would be nice.

Re: 28 TD Daytona x dimension question?
 

That's exactly why I run them right there! Must be P5X's not P5's. I found mine barely used from another OSO member mv35 in New York. $750 a piece

I don't have enough hp to tear anything up, so that's not a concern.

Aren't you running hp500's?

Re: 28 TD Daytona x dimension question?
 

I'm runnin a pair 625hp, 540na.

I remember seeing those for sale a while and thought about them.

Re: 28 TD Daytona x dimension question?
 

I'm trying to round up a group purchase on shorties if anyone's interested. I'm going to get a set if the price is right and if we can get enough guys together to make it happen.

click here:

http://www.offshoreonly.com/forums/s...d.php?t=120414

Re: 28 TD Daytona x dimension question?
 

Harper220, I just read your offer to put together a group buy on drives. You say your drives are 1/2" - 1" above the lowest part of the sponsons. You really need to measure right in front of the prop shaft to get your dimension. Eliminator did not always use the same distance between engines (drives) back in in the 1999 - 2001 era. Measuring the way you are in reference to the lowest spot on the sponsons, the farther apart the drives are, the lower the X dimension.

Be sure to measure both sides, I saw a 30' where there was an inch difference between sides.

Re: 28 TD Daytona x dimension question?
 

harper i sent you a message i can hook you up on the shorties I can also get you a deal on a monster tab from dana if your interested

my drives are 2" above the bottom on my 33daytona i am running 32 pitch p5x props

Re: 28 TD Daytona x dimension question?
 

It looks like a boat with #6's with the rooster's it throws too! :drink:

Re: 28 TD Daytona x dimension question?
 

:evilb: :drink:

Re: 28 TD Daytona x dimension question?
 

In these pictures, does it look like I'd be safe going up 2" with IMCO shorties? I'm roughly 1" below bottom directly in front of the gearcases.

This would put me at 1" above bottom. Would this make sense to do?

Re: 28 TD Daytona x dimension question?
 

Here are the drives on my 33 before the shorties

Re: 28 TD Daytona x dimension question?
 

Do you have an after shot?

Re: 28 TD Daytona x dimension question?
 

i will take some asap

Re: 28 TD Daytona x dimension question?
 

Where was your x dimension or (propshaft) before the shorties? Above or below bottom?

Re: 28 TD Daytona x dimension question?
 

even with the bottom straight in front of the drive

now it is 2" above the bottom

Re: 28 TD Daytona x dimension question?
 

Wheeew! That's good to know... :D

What were your results after you raised up 2"? How did the boat handle and get on to plane? What did it do to your trim while underway?

Re: 28 TD Daytona x dimension question?
 

picked up speed and acceleration the boat doesn't need much trim now i run 5 blades it comes up easy

Re: 28 TD Daytona x dimension question?
 

I'm running 29p Hydro p5x's, so hopefully planing won't be an issue by raising up 2". What brand of props are you running and pitch? How much speed did you pick up?

Re: 28 TD Daytona x dimension question?
 

Follow up: I had the IMCO 2" shorties installed a few months ago and finally had a chance to try them out a few weeks ago. With 5 people aboard and nearly full tanks it took me forever to get on plane, it was actually a ***** to where I don't want to deal with it. I had 3 of the guys get clear up in front cuddy just to plane out and then within 15 secs. I was overheating. :( Needless to say, I had to idle back and put the boat back on the trailer. I touched base with the dealer who installed them and it sounds like going up 2" is obviously too much. I didn't get a chance to run any performance numbers due to overheating. So many variables involved. A tab might cure the planing issue, but then I'm still overheating probably due to water pickups starving for water being up too high without boxes. I don't really feel like adding a tab. Anyone have any ideas? Might put some 1" spacers back in with hopes I will plane out better and get my water flow back. It has been suggested to add bottom pickups to get my overheating under control, but then I still need to get my x dim correct. This was definitely not the results I was hoping for. Again, any recommendations would be welcomed... My Eliminator dealer is at the regatta and poker run, so I haven't been able to discuss exactly what needs to be done. Help?

Re: 28 TD Daytona x dimension question?
 

what gear ratio? I would of thought that with a 2 inch shortie the prop would of been blowing out if was to close to the surface.

Re: 28 TD Daytona x dimension question?
 

They're 1:36 ratio. I'm pretty sure gear ratio wouldn't have anything to do with blowing out. It's a twin set up and I'm running Hydro P5X's. I'll have to wait for the dealer to get back next week and get this dialed in. I don't want to spend a fortune with boxes and a tunnel tab. I would imagine I'll have to space back down. This is what happens when you start messing with things. I should of just left it alone, since it's all ready cost me a day on the water.

Re: 28 TD Daytona x dimension question?
 

Harper:

Sorry to hear about your problems, I can't believe you are blowing out that bad only being 1" above the bottom. Unfortunately that tells me you are gooing to need extension boxes to make things work. You'll also definately need pick-up's in the bottom of the boat with the short drives...Khadley had to put them in his 33 Daytona when he put the short drives on for the same reason.

Re: 28 TD Daytona x dimension question?
 

Thanks for your concern. I was surprised too about the planing issue. What's the difficulty level in adding bottom pick ups? I would imagine it would involve cutting into the bottom of the boat and mounting the pick ups then running a hose to the water pumps. What do you think adding 1" spacers would do?

Re: 28 TD Daytona x dimension question?
 

The problem is to get pick-ups in the correct position and sealed, clamped, etc, etc you really have to pull the motors to have any chance of reaching things. If you go through all of that you might as well go ahead and put boxes on.....My pick-ups (measured from inside of boat) are ~4" from the bottom of the sponson and about 2" from the where the hull "steps up" at the rear. You don't want the pick-ups directly in front of the props, cut them off so they are ~flush in the front with the bottom and hang down 1/4-3/8" in the rear. The best way is to plumb pick-up to a sea strainer and use pressure relief dumps (on the strainer) to get rid of excess water pressure...because it will be a problem. I used Teague strainers and Watts dump valves. I had a plate made with an AN fitting and hooked braided line to dump the water from the drive pick-up back out the rear of the boat...some people dump on their drives or just plug entirely. The above has worked great and you never have to worry about getting water. We copied what Khadley did to his 33 and no issues there either. Spacer could help, but if you do that maybe it would be better to just put your old lowers back on...??

Re: 28 TD Daytona x dimension question?
 

I would never attempt adding bottom pick ups myself. I was just curious what's involved and it sounds pretty extensive. My first consideration was to just put the old lowers back on, but the dealer said at this point spacers would be the most economical fix. I'll just have to discuss with him in depth where to go from here. I didn't expect this would turn into a pricey ordeal. Question: If I spaced back down let's say 1", would the design of the IMCO lowers themselves have a performance gain over the stock lowers?

Re: 28 TD Daytona x dimension question?
 

I would guess the Imco's would be better than the HP bottoms. Another thing you can try is making a piece of flat to bolt onto your cavitation plate...make it like 1/2" wider on both sides and like 2" longer. I've been told that has worked for some people in the past. Also, are you running the IMCO cavitation plates?

Its really pretty easy to put the pick-ups in....after you get over the thought of drilling holes in your boat..... :D oh yeah, and get the motors out of the way.... :p :drink:

Re: 28 TD Daytona x dimension question?
 

The IMCO cavitation plates were installed with the new lowers. I'm taking the boat in Wed. to do some measuring to size things up. I talked to dealer and more than likely 1" spacers will have to be added with hopes that this will bring the water flow back. I really hope that the spacer will fix both problems. I don't like the sounds of pulling the motors... :eek: I'd put the old lowers back on before it got that far.

Re: 28 TD Daytona x dimension question?
 

I hope you get it fixed fast. Summer is almost here. :evilb:

Re: 28 TD Daytona x dimension question?
 

Took boat in and had the x dimension measured. It was 2" above bottom, which is too much without boxes. Dealer talked to IMCO and decided to put 1 1/2" spacers back in. Boxes will have to wait till another time. At least I can go back up when that time comes...

Re: 28 TD Daytona x dimension question?
 

Had the 1 1/2" spacers installed and ran boat. The hole shot was still a little touchy, but the engines stayed cool as I got my water flow back. The big news is that I picked up 4 mph on top. 91 was best to date with the Hydro p5x's and I ran 95 last night. It was smooth glass water, so I probably could of got a few more mph with a little chop and a little more trim. Needless to say I had a big smile on my face... :D