Harper220

Just curious if anyone has tried the new Mercury Maximus 5-blade prop or know of anyone who has?

I have a 28 Daytona with twins and just curious if they would benefit this boat?

Turbojack

Hopefully in 2 weeks we will be trying a set on 28 daytona. So far we have tried about 5 or 6 different props & the best so far is his orginall 32 labed bravo 1

Harper220

Turbojack- What power in the 28 and is it a tall deck or lp? Boxes or shorties? What props have you tried and their pitch?

I have been considering a set of 32 labbed Bravo's myself. I'm mainly looking for better mid-range between 3000-4000 rpm's. I'm not sure the 32 labs will do that, they may just give more slip at mid-range with no improvement over stock Bravo 30's, which is what I'm currently running.

FYI, I have 496 ho's in my 28 TD.

jdnca1

Harper, you'll loose a lot of acceleration going to 32's even labbed. I would lab your 30's...if you're on the limiters get them bumped up.

I ran a set of labbed 33's on my TD 28 last yr (500EFI's) and had almost no acceleration...although on the very top they were slightly faster due to my 30's being on the rev limiters. That was with no boxes. I put boxes on this yr and just had the limiters raised so I could continue running the 30's for the mid range. I'll let you know next week how much I pick up with the boxes, based on how easily it hits the limiters before I had them raised, I think it will pick up at least 5mph with the boxes. (std length lowers for now)

I turn mine IN, but I've heard they are slightly faster turning OUT....however you will pick up a porpose in the 60-80 range.

NJDave

Hey Guys. I have a 1999 28 TD that I bought this year. The best I have seen on GPS Spedo is 95 @ 5050 rpm. The boat has 2 HP500's carbs with 300 hours on them. It is turning 2 bran new stock Bravo1 4 blade 30p & they are turning in. I tried them turning out and got a really bad planing time because they were blowing out even under light throttle and the best top speed was 92. Any way I sent them out to John York at York propeller to get lab finished. He was the only guy that Eliminator recommended. The service manager told me that they send all there race boat props to him. He said he could get 200 more rpms by labing them and no pitch change. That would put me @5250 rpm which is where the rev limiter is on these engines. My question is 95@ 5050rpm seem a little weak to me? Do you guys have boat model, engine model, prop size/ rpm's and top speed on GPS to share?

Also I got the best speed of 95 with just myself in the boat and 1/4 tanks of fuel. The guy I bought the boat from claims 100 mph but he put 5K worth of high end audio equipment in the boat right before he put it up for sale do to a divorce. He put 2 12" sub woffers in enclosures up in the bow and 3 Rockford Fosgate amps behind the lounge seat in the cabin. Those items weigh about 200lbs and I wonder if it is hurting my top speed with all that weight in the nose? Any help would be greatly appreciated.

jdnca1

NJDAVE;

My boat has a big stereo as well with Rockford 15" s in the front in boxes and 3 amps up front. While extra weight certainly doesn't help I don't think its much of a factor with twin big blocks as it might be with say outboards. Probaly less than 1mph. My 00' 28' TD runs 95GPS with 30 Bravo's on the limiters @5200 any weather any fuel level, but pretty strung out to get there. I turned 33 labs 4900 for a best of 98GPS last yr. That was with 2/3 fuel and ~85 degrees and high humidity, flat water. We ran 93GPS with 6 people on the same day with the 33's.

Boxes: plane much easier than before, get me to 95 easily, now and have to pull back to ~85% to stay off the limiters....which just got raised. I will say as a general comment that when the fuel gets down to 1/4 tank and (2) people the boat accelerates much better as you would expect. One thing I found is my 28 has 2X80 gallon tanks according to the data on the tanks vs the 2X70 gallons its supposed to have.

Keep in mind Eliminator puts their drive heights and motor seperations all over the place which makes a difference in how they run. Mine has the "wider" seperation and while I've never measured it, the drives are ~even to 1" below to the bottom of the boat eyeballing it.

NJDave

Thanks JD. I would like to talk to you on the phone.You can call my cell @ 201-394-8391 or I can call you. thanks

throttleup

We have a customer we have been working with who has a 28 Daytona with the 496 mag (non HO).

We tested several different props on his boat. These are the results we got;
Bravo 1 30 stock 88@4800
Hyrdromotive Quad IVX stock 89@4800
Hydro P5X 29 stock (test props) 88@4800 (cruise speed @3500 went up 7 mph)
Maximus 28 82@4400 (this was done without me present so I don't know if it was stock or not)
Hydro P5X 29 stock (production) 88.3@4600

Of course you would expect more with the 496HO or HP 500 motor. The 5 blade props got up on plane with no "blowout" at all and had a cruise speed about 7 mph higher than the stock 30 Bravo 1's. Top speed with the P5X was the same as the Bravo 1 as well. Quad IVX runs about the same top end speed as a lab finished Bravo 1 but the problem has been just what JDNCA1 mentioned. With the various drive heights sometimes it is difficult to get on plane with 4 blade props.

Harper220

Hi Julie- It's Todd in Iowa, I've talked to you about the P5X's for my 2001 28 Daytona with 496 HO's. Looks like the Maximus bit the bullet on top end, I can't imagine what the mid-range would be. From our previous conversations, you know that I'm looking for the mid-range gains, better hole shot, all while maintaining top end and if you're certain that this boat and prop combination netted 7 more mph at cruise then I would be sold.

Right now I'm pushing 60 mph at 3500 rpm. 70-72 mph at 4000 rpm, this is where the boat really starts to lift, so I could see a huge gain at around 4000 rpm with the efficiency of the boat and the prop combination. I'm guessing 80 mph at 4000 rpm, that would rock! Right now I'm bumpin 5000 rpm with stock Bravo 30's at 92-94 mph. I would sure like to hear testimony from the owner of the 28 Daytona that you tested. Then I would probably buy a set. What pitch would you recommend for my 28 Daytona with twin 496 HO's, considering the 28 Daytona you tested had 496 non HO's and ran 29p P5X's at 4800 rpm? With the HO's I should be able to turn the 29's up to 5000. Do you have 29's available?

Harper220

Dave- I can't imagine that an extra 200 lbs would chop off 5 mph. I would assume he was fibbing about the top speed to begin with.

I had a monster Adire audio 12" Brahma sub-woofer way up front in cuddy and had it stolen along with one amp. I then added two TREO TSX 12" subs in sealed boxes and placed them under the driver and passenger seats in cockpit and they absolutely rock compared to having the subs in the cuddy. Night and day difference! You should consider this if you want about 10 times the output out of your system and also distribute the weight more evenly... Just a thought.