Tow haul mode?
Pulling 10,000 lb fifth wheel with f350, 6.4 deisel.. do you have to always use tow haul mode even on flat interstates?
Forum Discussion
avvidclif1 wrote:The 6.4 doesn't have an exhaust brake - the 6.7 does.
Here's the explanation on the 6.4 Ford operation.
"I’ll try to explain. Exhaust braking closes off (blocks) the exhaust manifold, leaving the exhaust gases in the cylinders to compress and slow down the engine. Engine braking doesn’t allow fuel to be injected into the cylinder, so a vacuum is created in the cylinders, which slows down the engine, which is connected to the transmission and slows the truck down."
Copied from The Diesel Stop".
All I know is it works. Cruise control set on 60mph. It held it at 60mph down a long 6% (marked) grade. I never touched the brake. Grossing 18,100 lbs.
Proved it to me.
PS A jake brake and an exhaust brake are different things. Look up how a jake brake works on a big truck, no flapper vales, all done by holding open valves.
What you describe is correct for the 6.4, just simple engine braking combined with the integrated brake controller and tow haul telling the torgueshift when to shift.
Not sure where the "jake brake" came into the discussion.
