2004 Stratos 201xl w/ 04 ox66 250 and AFTERMARKET Lower Unit

[dbo27]

So I purchased an SEI aftermarket lower unit. Before purchase I was running factory lower unit (1.75:1 ratio) at 73 mph gps at around 5700-5800 rpm. I do have an 8" manual jackplate and typically run full gear with two 200# pound guys. New lower unit is an 1.81:1 ratio. Now that I have finished the break in procedure I see I need to re-prop. I can turn it over 6k and roughly 60-62 mph gps.

My question is: Are any of you guys running a similar set up? (1.81 lower)
If so what prop have you had the best success with?

Appreciate any info ahead of time!

[Bubba201proxl]

I'm curious on this. I figure it's gonna take a pretty tall prop to achieve any kind of speed. Following!

[rchavis]

Like above a taller prop or have yours worked to lower the RPMs ....i would gave Mark C a call over on the prop forum .

[javelin90]

Curious as the cost of the SEi?

[M4A1]

Curious as the cost of the SEi?

You can get them shipped to your door for around $1,000. They are an awesome deal with the warranty.

[mactlman]

why would they change the gear ratio???

[dbo27]

The SEI unit was just over 1k shipped. I am waiting for a return call from Croxton now. Had him do a prop for a Bullet few years back and he was spot on helping me prop that boat. I searched high and low for a 1.75:1 lower unit. Could not afford to drop $2300 in a lower. Extremely unhappy about the loss in performance. Hoping I can prop it back into a ballpark of where I was.

[M4A1]

The SEI unit was just over 1k shipped. I am waiting for a return call from Croxton now. Had him do a prop for a Bullet few years back and he was spot on helping me prop that boat. I searched high and low for a 1.75:1 lower unit. Could not afford to drop $2300 in a lower. Extremely unhappy about the loss in performance. Hoping I can prop it back into a ballpark of where I was.

I've never played with an SEI lower that wasn't on a Merc, but I saw a drop in speed with mine as well. Probably just casting differences, but who knows. It was about 2-3 mph slower than a Merc unit.