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Props, Setups & Rigging This is our Checkmate setup forum. Topics include props, jackplates and setback, trim tabs, steering etc. This is also the forum to share your best setup tips and top speed numbers. So come on in and exchange setup details with your fellow members.

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Old 01-06-2020, 09:46 PM   #1
PA-Checkmate
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Model Owned: 2002 Convincor 270 496-MAG-HO

Default Bravo-1 and Hydromotive should I lab?

Got both props last summer purchased new. Bravo is 24P and hydromotive is the OBX-4 24p. Both run so close to each it's hard to notice any difference throughput the RPM. Both run 66-67 with 20-40 gal fuel and as many as 3 riders. Any advantage to the lab service? Anyone due this and what was before after results?

Convincor 270/496-425hp

thx
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Old 01-07-2020, 08:58 AM   #2
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Model Owned: 2000 Powerquest 380, 1987 Starfire, Past: 1997 253 Convincor,

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I saw your post on OSO. Definitely verify your injectors first and get a baseline since you said a buddy has same motor and same props and runs faster than you. I remember reading something about the 496 also having a soft or guardian mode limit at 4800 (80% power) as well that sometimes need to be cleared, poor injector flow might cause that. Those motors are hard to diagnose without a scanner due to all the sensors. Also check wires and plugs as that motor has a persnickety ignition system.

A buddy who had a 259/270 and 485 hp motor responded better to a BBlades labbed Bravo I than he did the Hydromotive QIV which my 253 liked better. I see you have an OBX hydromotive so that should be a round ear bravo copy basically with slightly less diameter i imagine.
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Old 01-07-2020, 08:47 PM   #3
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Gimme Fuel, When I purchased it had a 23P Mirage+ and would turn 5K@63gps. Has no faults in ECM, but did notice water PSI was 40 at and near WOT which I told is too high. Going to look closer this spring which I may find is a faulty PSI sensor or restriction somewhere? It's a closed system. HAs new wires(from BUP-OSO) and plugs too. Engine just turn 200hrs(2002 engine).. and removing injectors this spring. Some say clean them, BUP suggests replacing with newer design???
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Old 01-08-2020, 04:54 PM   #4
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Id clean injectors and go from there. BUP is knowledgeable but rubs me the wrong way anymore on there.

I have a good friend locally who cleans/services them. Arcticfriends on OSO (Smitty) will do them by mail.

Its winter, I'd send them out, check cooling system, and try for a new baseline in the spring.
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Old 01-11-2020, 04:33 PM   #5
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I have a 259.
When I bought my 28 bravo, I really liked it but it had some nicks in the leading edge.
After I had it re-worked and semi labbed, it now acts a lot smaller than it used to and runs way higher rpm.
Im looking for another stock one.
Moral of the story, I think the stock bravo works well with our hull.
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Old 01-13-2020, 09:18 AM   #6
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Buddies 259 gained solid 2-3 mph with BBlades labbed 24 bravo prop on 470 hp. Exactly what the lab recipe was (as he did not get real scientific/technical with it), I am not sure but boat responded well to it.

Technically the Hydromotive is almost 1" higher in pitch than bravos since the merc props tend to be slightly lower pitch by close to 1" than what is stamped.

Your OBX states they have 3 different cup/flare ring recipes for that prop. Do you know what one you have?
http://hydromotive.com/products/prop...-quad-iv-x-ob/
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