Originally Posted by minxguy

Mark, your wife back in the boat with you?

Ken

Originally Posted by snave8

I gained 4-5 MPH by adding the shorty to my non-ho 496.......But, that's comparing what I was seeing on the stock Livorsi water speedo to what I'm seeing now on GPS....I know, I know, I should've GPS'd it before installing the shorty.
I'm not sure whether the stock water speedo's typically read higher or lower than actual speed.
I was turning the Bravo 1 26P around 4500-4600 RPM. With the shorty I'm turning 4900-4950 RPM
From a seat of the pants feel.......The boat fly's now,

Mark

Originally Posted by Pat McPherson

My numbers are nearly identical with stock drive and 25p Rev 4. From last Thursday, I saw 71.2mph on my phone GPS @ 4900rpm.
A stock 26p B1 prop is about the same pitch as a stock 25p Rev 4. We are seeing about the same slip/efficiency.

As for a pressure driven Livorsi speedo, if liquid filled and using pito in the drive, they are pretty accurate. At least the one I had in my 280 Velocity and the one a bud had in his 29 Fountain were on the money...

Originally Posted by Pdm

Is that what you have?