228 series top speed question

[sharkfhin]

I recently own a 2018 228 with a suzuki df200a...

I tested her for first time and I got a top speed of 42mph with 2 people riding. Motor has a jack plate and also trim tabs. I think the jack plate was set right under 2.0, like around 1.7 if that's even a number. I didn't use the tabs on any level. Can a Jack plate or tabs increase the speed? I was warned about jack plate to know how much u can set it to to avoid problems, that's why I had is set to that figure. Can someone shed light on this matter. What settings I can use and why?

According to suzuki marine tests. This exact boat and motor should get closer to 48mph top speed...

[gnrphil]

What RPM are you getting at WOT and are you trimming the motor up enough? (sorry gotta ask). A few things can effect top speed, engine height, prop etc. Take a look at your anti ventilation plate while up on plane at WOT, can you see it?

[framer9]

Same boat and motor , 43.5 is as fast as she goes. I think the factory specs are for boats without t-top?

[sharkfhin]

Yes I was trimmed. I didn't notice rpms. I just don't understand what's jack plates purpose is. Trim tabs I sorta understand.

Sorry I have to ask but what is ventilation plate?

[gnrphil]

Anti Ventilation plate is on the lower unit sometimes referred to as a cavitation plate, jack plate a good for running and operating in shallow water, allows you to raise the motor to get into those shallow fishing spots.

[sharkfhin]

After watching a utube video, what u said is correct....thanks

[demar002]

2021 228. Jack plate and Tabs. 200HP Suzuki. 2 guys in the boat. Gas tank 3/4 filled. 43MPH was our top speed