prop question for a formula 242 ls 350 260hp
 

hi im new to the forum and the boating world, I realized my boat is a heavy tank haha and with a single 260hp motor it will never be a rocket ship but I was wondering if anyone has some experience with these boats and could give me a little heads up on if a different prop could give me a few more mph, trimmed up on glass water im lucky to hit 40mph it is completely stock with 350 hours on her. im looking to maybe put a thu hull exhaust and a different prop to hopefully get 45 mph, as for whats on there now I meant to take a look this morning before I left for work but completely forgot, (still half asleep haha) but any info and help would be greatly appreciated thank you!
:ernaehrung004:

I ran home and took a look its a mercury marine vengeance 14" diameter and a 19 pitch not sure of my rpms at WOT my tach is not working put I plan on fixing that this weekend

What rpm are you running at WOT to get 40

...uh...yea. This might be important. :lolhit:

Somewhere over idle rpm.

My tach is broken I plan on fixing it this week :silenced: what should I be running at WOT?

LOL.

4600-4800. Try to get to 4800.

I didn't know how important a tach was on a boat! Lol I'm a newbie :( I'll figure it out as I go:) I'll get some rpm numbers and keep you posted:)

Thanks for saying that, Do you knowhow to use the trim (down ) for planing (taking off) and then to trim (up) to loosen up the boat for cruise and then some more usually for top speed ? Tach and speedo (gps favorable) for top speed ?

If you have trim tabs - basically same thing in conjunction with drive trim ?

Yes I was told about trimming down the engine for take out then trim up for cruising I would hear the engine smooth out and could feel the boat pick up speed I do have trim tabs but I didn't touch them I'll try that too and see if that helps and I got my speed from my gps since the speedo is the other gauge that doesn't work lol