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Need help with jack plate set-up!

Just bought a '93 Nitro 170 with a 115 Merc. Came with jack plate and with small porpoise fins or whatever they are called. The boat pulls very hard right coming out of the hole; trimmed under. Flat out running about 50 at 5200rpm it pulls slightly left. I know I can adjust the trim tab but feel it would have a bigger impact at full speed. Would be scared to get too much pull at top speed as it feels like it is skimming a little bit as is. Should I lose the porpoise fins? Does it sound like the jack plate needs adjusting up? or down?
thesportwagon
Mar 21
2005
I can't help answer any of these questions, but until Pat Goff shows up, check the guys at Nitro Owners website: http://www.nitroowners.com/nitroowners/

I think Huck pointed me there when I bought my Nitro 700LX, and they've been a great source for information.

Oh Yeah, Pat Goff is da man, so listen closely to him.

Charles
Mar 21
For the benefit of those that can answer your question and just so they will know. What prop do you currently have? The size and pitch?

From the hard pulling I would guess you have a big 3 blade of some kind. But knowing should help Pat or someone else answer your question.

Carlos
Mar 21
More of a tilt/trim issue?

sket

Mar 21
Torque pull is normal on most performance boats. You're feeling torque pull one direction when the prop is buried in the water at take off, then a different direction when the prop surfaces.

It should be pulling to the right, which means you're holding a left turn to correct it. That is normal. It can be relieved some with some minor modifications.

First, you can adjust the torque tab on your motor, 9/16" deep socket, loosen the bolt holding the torque tab and move it all the way to the right (driver side) that should help most of it. If it's still more than you like, you can purchase an aftermarket torque tab that attaches to your skeg, and that will take 90% of wheel torque away.

But, one persons perception of "a lot" is anothers "normal"

Pat
Mar 22
   

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