Wondering if anyone could help me with my prop diameter question both props I currently run are 14.25 diameter
1st one is a 21p vengeance which I like but it runs my boat on the rev limiter at 57 mph on gps
2nd one is a 22p turbo that drops me down to around 4600 and leaves me at about 55-56 mph on gps
my question is do I go bigger diameter on a 21p or smaller diameter on a 22p for my next prop any help would be great

If it's a small block, alpha, and light or semi light boat they seem to like smaller diameter props...cleavers exempt. But, ultimately, your boat will decide.

Maybe try the next Vengeance up a size.

I have tried the vengeance in a 22p 14.25 dia. With same results the boat has a 300mag mpi with a bravo 1 drive

Still hits rev limiter....go up another.

Mercruiser does not list Vengeance in a 22P.
https://www.mercurymarine.com/en/us/...ies/vengeance/

SPORT SERIES
Vengeance®

All-around star performer.Quality, durability, value.

• Available pitches 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 23, 9, 9.5
• Rotation LH, RH
• Performance vent system (PVS) No
• Boat types Bass, Cruiser, Deckboat, Houseboat, Inflatable - Soft Hull, Inshore Fishing, Offshore fishing, Pontoon, Runabout - cuddy, Runabout - open bow
• Number of blades 3
• Material Stainless Steel
• Fits Alpha drive, Outboards 20hp - 250hp

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21" Vengeance listed as 13.75 Diameter.

23" Veneance listed as 14.25" Diameter Scratch this, I see some state that this has 13 1/2" diameter....so I really don't kno which it is at this point.

Sorry the 22p vengeance leaves me at around 4600 rpm not on the rev limiter like the 21p I thought about getting a enertia but they are a little pricey so that's why I'm looking for some tips I like the hole shot of the 21p but didn't no how much bigger I should go diameter to drop me down to that 4800 mark thanks for the help

I'm almost positive it is a 22 vengeance I'll have to look at that again tonight

There are no 22 Vengeance.
On a pplication such as yours, diameter isn't as big of a factor as some other set ups. You need to be most concerned about pitch to control rpm and number of blades to control the boats personality.

Brett.

So you guys were right ive true a 22p renegade and 22p Turbo the 21p vengeance I'm running is 13.75 diameter