Baja555

just got a 31 american with 500's.. wondering if extension boxes work and if so nuetral or -1 or -2 s? with standard or shortie lowers? looking to get to 115 mph.. how much power? will 650's do it?

chromecat

what year boat? probably get there with boxes and blowers on top of the 500's.... what drive,what x?????

Don

tssteph

Which boat did you get? Pics?

phil_p999

Wich boat did you buy? I just bought one with the same setup,
I have a pair of stelling boxes. The boxes have lifted my X up to 1" above the bottom of my sponsons.

You will need more than 700's to go that fast depending on the year of your boat.

Let see some pic's......

Baja555

95 Boat was in NJ bravo's propshafts are even with the bottom I have a -1 shortie will get another one if they will work..

tssteph

Even with the bottom with no boxes is as good as it gets. With stock lowers i have not seen one be even with the bottom. Maybe some have different X's thought. Most people use a -2 lower to get very close to even with the bottom.

Baja555

yeah, its even with the bottom standard lowers

chromecat

you put up 1 maybe up 2 with boxes and blowers on the 500's ... get it to 650-700 hp.. work with the props ... you should get there ...

Don

ROTAX454

Agree. Perhaps built or in-service modified with the transom mount relocated. In any event, my calculations show when using a 12" set-back (IMCO neutral boxes) that you gain +1 inch. So, if Baja555 where to install neutral boxes and his -1inch shortie lowers, bada bing he is at 0 to the hull. Beyond that, get with a darn good prop professional (Brett at BBlades) and it's all with the prop set-up.

Adding boxes to your 31 AO is one of the best add-on's that you can do. Speed aside, the handling characteristics are well worth the cost.

ROTAX454

Phil, Speaking of pics, where are some of your new ride?