Best prop for top speed
#1
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Best prop for top speed
I have a 99 25ft Colbalt with 454 mag mpi. I currently have a bravo 3 with 28 pitch prop. My maxed RPM is 4800 at 56mph. Would I be better off with a 24 or 26 prop to reach a higher rpm and speed?
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I run 28p on my Bravo 3 driven Baja 272. I've seen 61mph (GPS), bone stock engine. Not sure of the RPM though. I have another set of 26s, and not a huge difference.
Don't change your B3, one of the best drives out there for a boat like that.
Don't change your B3, one of the best drives out there for a boat like that.
Last edited by puzzleboy; 09-12-2011 at 01:19 PM.
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You should be turning 5K RPM at WOT with a 454 MAG MPI. You can have Brett at BBlades work those 28's to gain more RPM and top speed.
#6
According to my Cobalt manual you should be using a 26P propset for
your Bravo 3 with a 454 Mag MPI. The 502 Mag MPI used the 28P
propsets. This is for the 252/253/25LS models. Which do you have?
Also you really need to get an accurate tachometer, digital is best,
before you do any more "testing" or make any changes. I went
through this myself and found significant speed increases with the
last 250 RPM's.
your Bravo 3 with a 454 Mag MPI. The 502 Mag MPI used the 28P
propsets. This is for the 252/253/25LS models. Which do you have?
Also you really need to get an accurate tachometer, digital is best,
before you do any more "testing" or make any changes. I went
through this myself and found significant speed increases with the
last 250 RPM's.
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I know the bravo 3 is faster than the bravo one up to 63 mph so I don't think my boat will be breaking this speed with my current stock 454 mag mpi. Im just trying to get close to the max speed performance of my outdrive.
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Yes BBlades is on my list. Also I thought that I had 28 props on my drive. It turns out they are 24. Must have been having one of those days when I checked em out.
I noticed on the rear prop, on the outer rim has a flat spot and is not totally round. I would guess this is whats causing my vibration when my boat has a load of people full cooler and tank of gass.
I noticed on the rear prop, on the outer rim has a flat spot and is not totally round. I would guess this is whats causing my vibration when my boat has a load of people full cooler and tank of gass.
Last edited by Colbaltmania; 09-13-2011 at 06:30 AM.
#9
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I have 24 props.
According to my Cobalt manual you should be using a 26P propset for
your Bravo 3 with a 454 Mag MPI. The 502 Mag MPI used the 28P
propsets. This is for the 252/253/25LS models. Which do you have?
Also you really need to get an accurate tachometer, digital is best,
before you do any more "testing" or make any changes. I went
through this myself and found significant speed increases with the
last 250 RPM's.
your Bravo 3 with a 454 Mag MPI. The 502 Mag MPI used the 28P
propsets. This is for the 252/253/25LS models. Which do you have?
Also you really need to get an accurate tachometer, digital is best,
before you do any more "testing" or make any changes. I went
through this myself and found significant speed increases with the
last 250 RPM's.
#10
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Yes BBlades is on my list. Also I thought that I had 28 props on my drive. It turns out they are 24. Must have been having one of those days when I checked em out.
I noticed on the rear prop, on the outer rim has a flat spot and is not totally round. I would guess this is whats causing my vibration when my boat has a load of people full cooler and tank of gass.
I noticed on the rear prop, on the outer rim has a flat spot and is not totally round. I would guess this is whats causing my vibration when my boat has a load of people full cooler and tank of gass.