Quote:
Originally Posted by CmdrDick
The turbo isn't getting enough exhaust flow at low rpm to help with the power. That is why many new engines have two turbochargers, one with a wheel for the low rpm range and a second designed for the higher rpm's. Under 1500 rpm, most older turbo engines get little help. A boost gage will give you a better idea about what a turbocharger is doing.
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It is called a "sequential turbo" and is not generally found in the boats we are talking about here. It is fairly common in cars. We operate our cars in a wide range of RPMs and power bands. So to avoid turbo lag and then a rush of power, they put the turbos in sequence...to give a more linear throttle response. Boats we generally set the power and are done with it. I guess all I am saying is sequential turbos don't really help in our application. You will see them in very high powered marine diesels....the "MTU range". I am not that familiar with the newest marine diesels so maybe they have small marine diesels with sequential turbos.....