8.2 with a Bravo 3

mbhenry1955

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A friend of mine just bought his 1st Bennington. 


It is 25 ft with the ESP Performance package with a 8.2 liter and a Bravo 3 turning a 26P prop set. 


Now I know this is a very heavy engine setup and I am trying to get all the numbers. 


Top speed is 40 mph and the RPMs aren't reaching where there should. 


Now I don't know what the RPR range should be but only 40 MPH doesn't sound right. 


Does anyone else have that setup?


What are your numbers?


 Thanks 
 

BulldogsCadillac

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How did that happen?


Big Blocks Specs


Boat Model:      2575 QCW I/O


Model Year:      2014


Tubes:               ESP with Sealed Lifting Strakes, Under Deck Wave Shield


Power:               502 HO (430 hp)


Drive:                 Bravo III X


Props:                Bravo III XR Pro, 27 Pitch


Load:                  Normal Gear, 1 Adult (165lbs), 36 gallons fuel


Performance:    57.2 GPS @ 4,950 RPM



Not positive that is the dual props, but definitely faster than 40!
 
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mbhenry1955

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I did notice that the duo prop setup that the primary prop is a 4 blade instead of a 3 blade.


That may make a difference. (I'm not familiar with the Bravo 3 Duo prop setups)
 

mbhenry1955

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Update,


It's a 8.2 430hp bravo 3, current max rpm's4000, top speed 40 mph turning a 26 pitch prop set.


The Mercury prop selector tool say he needs a 22p Prop set.


Rpm range is 4600 to 5000.


We have a friend with a 5.7 mag and a bravo3. Not sure what his prop pitch is but we may try swapping them to maybe see what the big block needs.
 

BigKahuna

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My I/O  is about half his HP (220) and it'll do over 40. Then again it's only a 22 footer and lighter. It came with a 17P Mercury Mirage Plus SS prop.......
 
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ssc

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Obviously, something is not correct. What is the RPM at WOT? More important, what is the altitude where he is running the boat? This will make a big difference. When I had my conquest with a 525, I ran a 24p. (However, for lake powell, I had to run a 22p due to the elevation.) I tried a labbed 26p. It lowered my RPM's a bit and kept me from hitting the rev limiter, but the holeshot and getting on plane was terrible. Also, I lost top end. Some shops have shop props that they will let you test. I would start with a bravo 22p and log the temp, altitude, speed and RPM. Lastly, how are you measuring the speed? Hopefully he has a GPS speedo and not a non GPS speedo--which, in my opinion, are worthless. The 22P should put you in the correct RPM range.


Cheers, Steve
 
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mbhenry1955

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Steve, I think that he needs either a 21 or 22 pitch. Trying to find one to test. 
 

mbhenry1955

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Latest update.


We think that there is a throttle linkage issue as we can't get it over 3800 in neutral.


Time to get under the hood!
 
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