Engine Braking?
Thread Starter
|
Posting Guru
Joined: Dec 2012
Posts: 1,644
Likes: 3
From: SW Ohio
Engine Braking?
So I have not towed anything heavy with the X yet and was curious if the engine braking works in tow mode. On the way back from picking up my THUGish 5 yr old, I took the long way home. There was a hill that is rated at a 7% grade, so as I approach I hit the tow/haul button and let off the throttle and let it coast down the hill.
At first I did not see any change and about half way down the truck downshifts and the tach jumps to 3k and stays there until I reach the bottom. The turbo was spooling, at least it sounded like the turbo, like I have never heard before.
So is this normal? How does the EB work? Is it like a Jake brake on larger trucks?
TIA for any and all responses!
At first I did not see any change and about half way down the truck downshifts and the tach jumps to 3k and stays there until I reach the bottom. The turbo was spooling, at least it sounded like the turbo, like I have never heard before.
So is this normal? How does the EB work? Is it like a Jake brake on larger trucks?
TIA for any and all responses!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
Tow/haul provides engine braking by downshifting the transmission and closing the vanes (not veins - there is no blood in a turbo!) of the turbo to create exhaust backpressure. The engine has to pump against this backpressure. That creates engine braking. It is also exactly how an exhaust brake works.
Tuned
Joined: Feb 2009
Posts: 484
Likes: 6
From: Alberta
Trending Topics
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
No, they do not. That is why the turbo vanes close to create backpressure. The engine has to pump against that backpressure, which creates engine braking.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Lead Driver
Joined: Sep 2012
Posts: 7,825
Likes: 96
From: Manteca,Ca
One of the reasons I bought the ford ,I love this tow haul , I remember driveing my dads 3/4 ton with an 8 horse full, down the salt river canyon
in AZ , He was always telling me to( stay off the brakes and use the lower gear)
, my foot was allways close to the pedal and I couldent wait to get on flat ground,I think ford only has that Option.
in AZ , He was always telling me to( stay off the brakes and use the lower gear), my foot was allways close to the pedal and I couldent wait to get on flat ground,I think ford only has that Option.
Thread Starter
|
Posting Guru
Joined: Dec 2012
Posts: 1,644
Likes: 3
From: SW Ohio
Thanks guys!!! I just wanted to make sure it was working as it should.
I understand the concept and that the VANES closed, but didn't realize it would try to hold a certain RPM for so long..
I understand the concept and that the VANES closed, but didn't realize it would try to hold a certain RPM for so long..
Elder User
Joined: Jul 2012
Posts: 654
Likes: 1
From: Fort Lauderdale, FL
I love the tow/haul mode on these trucks! Dropped down a curvy ten mile 7-8% grade coming down the west side of the continental divide pulling a 7k trailer and never touched the brakes once! Fixing to start hauling a 20k gooseneck water trailer and really looking forward to seeing how it works with that!
Mountain Pass
Joined: Jun 2006
Posts: 187
Likes: 8
From: Texas
Jake Brakes are a classification of compression brake.