X Dimension
#6
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Joined: Jan 2007
Posts: 2,064
Likes: 1,172
From: Murrayville Georgia
X dimension and drive height are two different things. is this a rigged boat? if so the x dimension is what it is as that is where the transom is cut and the gimble is mounted. you can then add spacers to lower the drive height. if this is a new uncut transom then you would need to know the x dimension that is best remembering that if you put it an inch too high you could always add spacers but if you put it too low then you can not ever make the drive height higher than that without a -1 or -2 inch lower. for the record when we raced F1 and F2 we had a minimum drive height and at first everyone went to that thinking that higher was better. most of the boats raced with spacers as we learned that higher resulted in more slip and worse handling.
#7
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Joined: Aug 2019
Posts: 151
Likes: 16
From: Brundidge, AL
So, the gimble location is standard as received from the factory. The lower is the standard for the IMCO from Teague. When I added HP to the boat, I blew the Bravo outdrive twice no matter how easy I drive it, even with a Drive Guardian. I don’t plan to set the drive back right now because I don’t want to have to change the hydraulic steering I already have. I’m just trying to get a feel for where the X Dimension should likely be with the 26 Outlaw. Hindsight says I should have gotten the -2 lower, to be able to adjust height, but it is what it is. Teague can change me to a -2 lower and I can space it if necessary, but someone with more experience might say stay standard because that’s what typically is best on this boat. Hate to buy the -2 and end up spacing down 2.
I’m going to spend more time running and getting better numbers, but I’ve always felt it was better to start closer to what others have found works and tweak it from there. What are some opinions on the Hydromatic QIV on this setup? I ran a four blade 24P Bravo with the stock 425 HP. I now have a Bravo 26P and 28P I’m trying with the 700Hp.
I’m going to spend more time running and getting better numbers, but I’ve always felt it was better to start closer to what others have found works and tweak it from there. What are some opinions on the Hydromatic QIV on this setup? I ran a four blade 24P Bravo with the stock 425 HP. I now have a Bravo 26P and 28P I’m trying with the 700Hp.
Last edited by 26 Outlaw Bad Influence; 06-25-2025 at 08:42 PM.
#8
Unless you are filling and re cutting the transom hole and changing your engine height, your X dimension doesn't change. X dimension is the engine crankshaft centerline and is usually set in the 16-20" area. Your X dimension is right about 16".
You are talking about how adjusting your propshaft height in relation to the bottom. IMO, you could easily raise you propshaft height 2" with a -2 lower. Only testing will tell what your actual gains will be. On my 28 Pantera(5200#) with about 550hp, I had the propshaft set to about 4.5" below the bottom and the boat performed well.
A QIV prop is a stern lifting prop and used more on stepped hull boats. I would stick with Bravo 1 props or maybe a QIV-X.

You are talking about how adjusting your propshaft height in relation to the bottom. IMO, you could easily raise you propshaft height 2" with a -2 lower. Only testing will tell what your actual gains will be. On my 28 Pantera(5200#) with about 550hp, I had the propshaft set to about 4.5" below the bottom and the boat performed well.
A QIV prop is a stern lifting prop and used more on stepped hull boats. I would stick with Bravo 1 props or maybe a QIV-X.

#9
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Joined: Oct 2022
Posts: 279
Likes: 88
From: WI
Unless you are filling and re cutting the transom hole and changing your engine height, your X dimension doesn't change. X dimension is the engine crankshaft centerline and is usually set in the 16-20" area. Your X dimension is right about 16".
You are talking about how adjusting your propshaft height in relation to the bottom. IMO, you could easily raise you propshaft height 2" with a -2 lower. Only testing will tell what your actual gains will be. On my 28 Pantera(5200#) with about 550hp, I had the propshaft set to about 4.5" below the bottom and the boat performed well.
A QIV prop is a stern lifting prop and used more on stepped hull boats. I would stick with Bravo 1 props or maybe a QIV-X.
You are talking about how adjusting your propshaft height in relation to the bottom. IMO, you could easily raise you propshaft height 2" with a -2 lower. Only testing will tell what your actual gains will be. On my 28 Pantera(5200#) with about 550hp, I had the propshaft set to about 4.5" below the bottom and the boat performed well.
A QIV prop is a stern lifting prop and used more on stepped hull boats. I would stick with Bravo 1 props or maybe a QIV-X.
I only ask as I am in a similar position and wondering if it's going from a b1 to a Q4
#10
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Joined: Sep 2021
Posts: 48
Likes: 35
Intimidator Quad IV-X







