INHO..The turbo is an excelant choice for a sailboat.. been working woth turbos for a number of years, and installed one on every vehicle I owned .. its a sorce for un-used eneregy.
A turbo is, as we all know, are advetised as a performance add-on for most cars, but turbos have been used for truck applications all the way back to the 30s & 40s.. Its a sorce for tapping into power at LOW RPM as well as High..
On a boat, the ability to run a couple extra degrees of pitch while still operating at the same RPM or even lower and still keeping the same speed would be a positive swap..
On a desplacement boat...Catch the word "displacement" your pushing water, and that takes power.. and if you can create more power with less motor, thats a savings...
And what I've heard, the new Yanmar with a turbo, it only weeps fuel.
and the cost of fuel is getting higher every day,
I would change mine out in a minute, if this old war-horse would ever give out... I've got a perkins 4108 and the new yanmar is a perfect swap but with this Perkins, It will probably be here long after I'm gone..