I am having turbo issues also. I talked with Doug at Acadiana Diesel here in in Louisiana. http://www.acadianadiesel.com I also talked with Turbo Supply
I have a 1984 Boston Whaler Sport 15 CC with a 50 HP Mercury 4-cylinder.
It had a 13 pitch prop that generated 30MPH, but WOT allowed Ron's at 6000...way
Re: i am at my wits end!
That is a low speed exhaust relief port.
RicardoMarine Today, 10:16 AMThe main sea water flow should be exiting through the propeller hub at the higher RPM range. If not, then