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Crownline 225 CCR 454 MAG is slow!!!

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Old 09-12-2019, 03:14 PM
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Yep i found out not all GPS apps are created equal. Quit being a royal d*%$@ and either help me or move on.
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Old 09-12-2019, 03:30 PM
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Trying to help using your supplied information from past threads. Best of luck.
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Old 09-12-2019, 04:18 PM
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Those numbers are off for sure. However the fact remains NOW its at 55 mph with a 25p prop. Im trying to find out information from someone that understand prop slip, pitch, diameter vs weight to see if a 21p would possibly increase speed instead of the normal slowing it down.

Maybe due to being over propped or other factors. I dont believe the coupler is bad, two different props with different hubs yielded similar result that I would say is typical but both props do seem like its not grabbing water compared to the many other boats I have drove. Just feels like

Im not getting all the HP and RPMS to the water compared to the sound. It gets louder and you can feel a increase in speed but not much. i know its got more in it and im looking for someone that knows these boats for similar readings or possibilities/things to check. Im going to check

the upper drive ratio next I think.
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Old 09-12-2019, 04:55 PM
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Are you sure you have an accurate mph now? Are you sure your tach is accurate? Are you over trimming drive? How do you know the past owner was truthful in his 64mph reading?
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Old 09-12-2019, 07:03 PM
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Originally Posted by cableguy1979
Yep i found out not all GPS apps are created equal. Quit being a royal d*%$@ and either help me or move on.
i was helping by mentioning the gps. You have numerous posts with pretty high gps numbers, maybe the gps.
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Old 09-12-2019, 07:42 PM
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hi 60's with 21p prop... if it has 1.5 gears that engine is around 5800rpm?

OUCH!
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Old 09-12-2019, 09:59 PM
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Originally Posted by underpsi68
Are you sure you have an accurate mph now? Are you sure your tach is accurate? Are you over trimming drive? How do you know the past owner was truthful in his 64mph reading?
was just gonna ask...how do you know the previous owner was telling the truth? So many times I hear “my boat run 80 this and 100 that”...or the infamous “ my boat can run thru 10 foot swells no problem”

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Old 09-13-2019, 10:09 AM
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Having owned a 225LPX with a 415hp 502, you will never, ever, see 70mph unless you’re towing. Low 60s is about as good as it will get, on a good day. And seems as though you have found that.

The hull is is not designed for it. As mentioned, a hopped up 225 from Ohio was able to break 70s and he never said it was enjoyable despite being able to run those speeds.
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Old 09-13-2019, 10:25 AM
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Originally Posted by Sunny32SSR
Having owned a 225LPX with a 415hp 502, you will never, ever, see 70mph unless you’re towing. Low 60s is about as good as it will get, on a good day. And seems as though you have found that.

The hull is is not designed for it. As mentioned, a hopped up 225 from Ohio was able to break 70s and he never said it was enjoyable despite being able to run those speeds.
I had a '99 266 (hull designs are basically the same, just longer/heavier and a tad more deadrise) with a 7.4L MPI and it would only run 48 - 49 MPH GPS on its best day and that was after Bronson-Hill reworked the props! The wedges just kill speed. You couldn't over-trim the boat. It would just eat trim up all day long.
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Old 09-13-2019, 11:01 AM
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My Challenger was running 72-3 gps with that motor. The CR had a built 540.
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