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25 daytona Max speed

Old 10-05-2021, 12:34 AM
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Default 25 daytona Max speed

I recently bought a 1999 25 daytona. It has a 540 with brodix heads, little over 8 to 1 compression with a BDS 8-71. The timing is set at 25, and boost peaks at about 6lbs. It has an older bmax drive, that is 1.30 ratio with their standard length lower. Prop is a 28 Bravo 1 that was slightly worked on, and has a 29 stamped on it.
It pulls about 52 or 5300 rpm and best I have seen with it is 88 on GPS.

I see people on here claiming to be running near or over 100 MPH with Less Hp than my setup. (I'm guestimating i should be around 750-800hp)

Do I have something setup wrong?
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Old 10-05-2021, 07:45 AM
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That setup should run triple digits. First of all, your timing is way late. Should be closer to 35deg. You are probably 100hp down at that timing setting. Next, check to see how far below the hull your prop shaft is. Might be too deep causing way more drag. You can always speed up the blower if need be.

Last edited by snapmorgan; 10-05-2021 at 07:47 AM.
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Old 10-05-2021, 10:31 PM
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Thanks for the reply! I was thinking the timing is a bit low too. The spark plugs look like the tune is pretty good, GUESSING it was dyno tuned. I run it on 91 octane, so I may increase the timing slowly over time but don't want to break the engine.
I also have a sportmaster -2 lower, but cant put it on until I get a coupler for BMAX to Bravo/Imco. I thought Eliminator installed the drives at the same height on all 25s. Using the plastic rub rail as reference, to me it looks the same height as other 25s.

Tried posting some pics, but Im new to offshoreonly and wont let me until I have more posts.
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Old 10-19-2021, 11:34 PM
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Originally Posted by Scotty17509 View Post
I recently bought a 1999 25 daytona. It has a 540 with brodix heads, little over 8 to 1 compression with a BDS 8-71. The timing is set at 25, and boost peaks at about 6lbs. It has an older bmax drive, that is 1.30 ratio with their standard length lower. Prop is a 28 Bravo 1 that was slightly worked on, and has a 29 stamped on it.
It pulls about 52 or 5300 rpm and best I have seen with it is 88 on GPS.

I see people on here claiming to be running near or over 100 MPH with Less Hp than my setup. (I'm guestimating i should be around 750-800hp)

Do I have something setup wrong?
For speed reference I drove Eliminatorís latest 25 Speedster (twin step bottom 25, i think itís the same bottom as yours) powered by a Mercury 565 ITS Sportmaster -2 shorty lower 1.50 gear ratio Merc Bravo1 32 pitch 5400rpm 92mph.
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Old Yesterday, 07:09 PM
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Originally Posted by lavey jr View Post
For speed reference I drove Eliminatorís latest 25 Speedster (twin step bottom 25, i think itís the same bottom as yours) powered by a Mercury 565 ITS Sportmaster -2 shorty lower 1.50 gear ratio Merc Bravo1 32 pitch 5400rpm 92mph.
I recently bought a sportmaster -2 with a 1.26 ratio that I want to try out. Problem is I need an adapter to go from Bmax to standard bravo (so im told). Hopefully that will pick up a few MPH. Also bought a whipple supper charger I plan to take off the roots blower and add a bit of boost. Changing the blower is probably going to be a winter project, as im going to fuel injection. Really would like to dyno the engine before and after, but really dont want to pull the engine at this point.
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