Tow/Haul on Truck
I'm wondering how many of you use the "TOW/HAUL" mode on your trucks. I'm assuming this only a function with newer trucks but I imagine it's a feature across the board with the various makes. I have a...
Forum Discussion
Grit dog wrote:
Someone please explain the "engine brake" on the Powerstrokes. . . .
I'll give it a shot. . .
To my knowledge, the newer Powerstrokes use a Variable Geometry Turbo (sometimes called a variable vane turbo).
In engine brake mode, the turbo vanes are closed, thus choking off air flow and causing engine compression braking - thus the term "engine braking".
In exhaust braking, there is a butterfly valve used, either after the turbo or in the exhaust pipe.
http://www.trucktrend.com/how-to/engine/0705dp-ford-f350-exhaust-brake-system/
Engine braking can occur without the use of a butterfly valve.
