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-   -   Guys still buying and using big power (https://www.offshoreonly.com/forums/general-boating-discussion/370922-guys-still-buying-using-big-power.html)

hogie roll 03-24-2021 07:24 PM
Originally Posted by Unlimited jd (Post 4782972)
Turbos have a much broader efficiency range.
They also have a boost controller and crank the boost up at planing speeds.

hogie roll 03-24-2021 07:27 PM
Originally Posted by Keith Atlanta (Post 4782979)
No, a gearing change in the procharger.
The nature of a centrifugal supercharger is that boost increases 1:1 with engine speed. In a boat you end up with not enough torque at planing speed and then wacking your rev limiter up top with more torque than you need.

hogie roll 03-24-2021 07:27 PM
Originally Posted by dsmawd350 (Post 4782988)
you can run vent tubes to the props to cavitate them and get them to get rev up and get on plane instead of lugging down
You should for sure do this if you run a centrifugal blower.

Wasted Income 03-26-2021 04:13 PM
Originally Posted by hogie roll (Post 4782991)
They also have a boost controller and crank the boost up at planing speeds.
That's not necessarily true. The nature of turbochargers is that when put under load (such as coming onto plane) they will spool and make boost independent of RPM. If an engine would need to have the boost "cranked up" to plane, it's a totally mismatched engine/turbo/gearing/prop package.

Originally Posted by hogie roll (Post 4782992)
The nature of a centrifugal supercharger is that boost increases 1:1 with engine speed.
Boost with a centrifugal blower is engine speed dependent, but not a 1:1 correlation

https://musclecardiy.com/wp-content/...015/03/428.jpg

hogie roll 03-26-2021 07:46 PM
Originally Posted by Wasted Income (Post 4783204)
That's not necessarily true. The nature of turbochargers is that when put under load (such as coming onto plane) they will spool and make boost independent of RPM. If an engine would need to have the boost "cranked up" to plane, it's a totally mismatched engine/turbo/gearing/prop package.



Boost with a centrifugal blower is engine speed dependent, but not a 1:1 correlation

https://musclecardiy.com/wp-content/...015/03/428.jpg
Thanks

ICDEDPPL 03-26-2021 11:13 PM
Originally Posted by dsmawd350 (Post 4782988)
you can run vent tubes to the props to cavitate them and get them to get rev up and get on plane instead of lugging down
you don`t need those with a roots or screw, plenty of TQ on hand.


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