2010 300 Convincor 496HO 58mph help!!
 

2010 300 Convincor with a single 496HO 25 hours

24 pitch three blade prop, 1.5 Bravo X drive.

Its getting all the RPMs it should from a 496HO


WOT its top speed is only 58mph!!

What is wrong with the boat????


Should run 10 mph faster.

Thanks

My guess is that's about all she is going to run in a 30. 58-64 depending location. Temps and water conditions.
In a 26 zt your lucky to see 62-65 with same motor

[QUOTE=CumberlandDayton;3924557]2010 300 Convincor with a single 496HO

What is wrong with the boat????




Truth? It needs a second 496HO.

Is it the 300 from alton blakley ? I don't think it's a notched hull.

[quote=powerplay j;3924625]

Correct, it is the boat from Alton Blakley.

So they made notched and non-notched hulls in the same boat?

Its really a 28' boat. And its light.


Checkmate says it should run 68 mph with a single 496HO

There is a 300 with a 525efi that runs 81 mph. 58 to 81 mph with 100-115 more hp???!!

Would love to see proof of that. :D

You can get the 300 with a notched transom or without , notched is faster. I tried a 3 blade prop on mine and it didn't like it, blowout and lots of slip so I went back to the 24 bravo. Later I got bblades to build me a prop, brett put some cup in it and it was much better.

I'd start with the prop. I'm not sure what kind of 3-blade you have on there, but if its a 24P, its not a Mirage, those only came in odd number pitches. Like checkered past said, I'd track down a 24 Bravo four blade and see how that does for ya. I know there are a few places around Cumberland that have some props laying around that will let you try them out before you buy them. Secondly, PROCHARGE IT!!!! lol, that'll make her run!!!

What engine do you have, and what is the speed?

Thanks

Yeah sorry, I'm not sure what it is then. I thought it was a 24 Mirage but it can't be both! ha

its a three blade so I assumed it was a Mirage, it is a 24 pitch I'm pretty sure. What model would it be then?

Thanks

496 ho now with a procharger.

What speed are you getting?

Sorry man not going there.I am very pleased with my checkmate and its performance.

Have a 2001 280 ZT with 502 MPI. Best I ever got was 64MPH GPS. By myself and low fuel. 55MPH with 4 people and coolers.
58 sounds about right.

If its a 3 blade I would try a 4 blade 24p
I tried a 3 blade on my 26 and lost about 4 mph it likes the 4 blade.
I pitched a 24 to a 23 on my boat. I personally would skip b blades as they tried about 5 times on my boat and I ended up taking the big money prop to a local and have him change it all back to stock and the pitch to a 23 and its better then ever.
The 22 hit limiter and the 24 was to low rpm even lab bed.
Now my old man has a 26 outlaw. I know its not same boat but close weight and same motor . His with a 23 3 blade ran 38 mph at 3500 rpm and max speed was 60
I put my old 22 4 blade on it and at 3500 rpm he went to like 43 mph and top speed of 62 but hit limiter and with my stock 24 r blade went 45/46 at 3500 and spun just around 4900/5000 and ran 64
That's all pretty light with 2 people on it.
So I say go 24 4 blade and give that a shot and your prob going to see 60-62 is top speed.
What is your location? That also has a lot to do with speed

Sorry for spelling and stuff. I'm on my phone and auto correct and fat thumbs don't go good.

I have a ZT 280 with a single step and notched transom w 24 four blade w same 496 HO that will do 70. 65-67 all day with crew. Speeds not everything... Great looking boat. Tried to buy it 2 years ago. Enjoy your new boat!

What gives? PM me if you don't want the secret speed getting out.

I'm thinking of installing a Whipple, it would be very helpful to know what speeds a blower is getting these boats.

Thanks

Have seen the boat very good looking boat. I really see no way that boat would hit 68 with that motor though. 26 with the same motor would be lucky to gps 68

I agree, 68mph is fast for this boat. But 58mph is way slow too!

My 270 runs 64, maybe touch 65 GPS w/a 25p 3 blade mirage.. However, I'd love to get my hands on a 4blade for a weekend!
On a side note, my tach has given me false readings on occasion. Just a suggestion

pm sent

It could be that the speedo is slow,if the hole gets debris in it or if the line is kinked or pinched it would be low.They ran the boat in an area known for debris.

no way you will see another 10mph. I own the same boat and unless you have the notch, low 60's is about all you will see. Your talking about a 5300lb boat with a conventional vhull (non step). If you want pure speed and the best rough water single engine boat, go buy an Activator! My tired 454mag was giving me 56-58mph and with my new 610hp/575tq motor I'm seeing a solid 73-75mph all day long and 76-77mph in optimal conditions at 6,000rpm. You could try labbing the prop if you need another 100-200rpm. Another prop I would try that the boat likes better than the Bravo is the Mercury Revolution 4. It carries the bow higher like a 3 blade with 4 blade driveability. My boat loves that prop. With a light load and two people you should be seeing low 60's on GPS but thats it.....

btw - the comments on 80 with a 525.....not a chance! This boat needs 675hp to run 80. If it has the notch, a solid 73 with a 525.

Way too slow as compared to what? In reality you are still faster than 98 percent of the boats on the water, if you count them all. This is the problem with boat speed, it seems everyone lies....even the manufactures. So you have your sights set on a number that is not a reality based on what someone trying to sell boats told you, or others telling you how fast their boats are.

Boats have 2 speed numbers, everyday speed, and perfect condition speed. Dock talk for an honest guy is sometimes difficult. Last year my boat would run 88 all day every day stock, many would ask and that was the number I gave them, only to hear "that's all"....."my friend has a Baja that does 96" blah blah blah.

Not to upset you more, but it will be SLOWER when we get in the heat of the summer and you get it loaded with your "stuff" It is what it is, a fairly roomy 28 ft boat with a straight bottom and nice lines. The average 25ft ish stock boat is going to run with you WOT, don't let them tell you any different.

Looking back this would have been a great question to ask BEFORE you bought the boat. The fact that you were fooled into thinking this boat would run 68 shows me you are not ready to have a whipple bolted to a 496 and deal with the problems that inexperience will cause there. Your money would be better spent swapping the engine for a 525efi.

BTW, 100 hp from a 496 to a 525 on paper yes, on the dyno NO. Not to mention one thing that is rarely talked about but is even more important.....torque. The 525efi or 500efi will be a reliable set up that you can hold WOT all day long with relatively no worries, that will not be the case with a blown 496

How high are you trimming it up ? My boat likes the tabs up and outdrive over half on gauge . Mine is a ZT280 with a 548ci no blower and runs solid 78-79 all day with a labbed 4 blade 26p... i would put a pro charger on anyday over any other blower ... it doesnt look as cool but the air temps are .

Im running 85mph all day long with 4 in the boat.

this is very true. its funny as well.
my boat on its best day (perfect water, perfect temps, low fuel light supplies ect) ran 62or 63 on 99% of the days it runs 60 "thats it" but my speedo says 72-75 ive told people these speeds before and i get the same thing " thats it" however when i run with them and we are side by side after they tell me they run 75 mph they tell me i lied about my speeds. i say no, i didnt lie. we where going 60. "no, my speedo said 75"
lol
oh well. i also came to realize that my stock 496 mag pushes my boat to 60 and i enjoy it. so thats that.
500-1000 more pounds and only 50 more hp im thinking that 28 with 50 hp more is going to be right around the same numbers as my boat.
id be happy with 60-62 for sure

UPDATE

Got the boat to 60mph with fuel and two people, still have RPMs left, this is with the Bravo 1 24 pitch. I think labbing this prop would net a few MPH. I'm happy with speed for a 30' boat.

Thanks for all the help!!

Also, this boat is for sale.

60 is an amazing day with that engine package, I have ran 9 different power packages in this same hull and lots of seat time in this hull. Feel free to email or send a pm if you would like any advice.

Jeff

try a 26 and see what happens, that size motor and boat seem to like that prop.