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Open Roads Forum  >  Tow Vehicles

 > Engine braking on 2017 F150 5.0L

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plasticmaster

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Posted: 03/28/23 10:11am Link  |  Quote  |  Print  |  Notify Moderator

I have a 2017 F150 with the 5.0 engine. When I tow my TT in tow haul mode, it seems to me that Ford has overdone it with the engine braking. As I apply the brakes, it downshifts really hard and revs really high to the point of making me wonder if it could damage the engine or transmission. On my last trip, I would disengage tow/haul when I knew I was getting ready to hit the brakes. Should I be concerned about this, or just let it do its thing?

Grit dog

Black Diamond, WA

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Posted: 03/28/23 10:39am Link  |  Quote  |  Print  |  Notify Moderator

Every newer truck with tow haul, including a 5.0 F150 6 speed will take the engine up to or near redline when it downshifts in a grade braking scenario.
The question is what is your perception or definition of really high and downshifts hard?
Truck is 6 years old, so is this a new condition or new to you truck, or something you just noticed?
And fwiw, engine stress at any rpm in this scenario are far less than full throttle under load at the same rpm’s, which the engine is obviously designed for, so no worry about the engine.

Trans is also designed for high rpm downshifts in the same conditions.


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Boomerweps

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Posted: 03/28/23 11:00am Link  |  Quote  |  Print  |  Notify Moderator

Whatever you are comfortable with as long as your TT brakes work well.
The tow/haul downshifting works great when hauling a heavy load in the bed.


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wing_zealot

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Posted: 03/28/23 11:03am Link  |  Quote  |  Print  |  Notify Moderator

I'm pretty sure the engineers that designed Tow/Haul mode know what they are doing. Frankly, I think it works great.

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Posted: 03/28/23 11:06am Link  |  Quote  |  Print  |  Notify Moderator

Compare the RPM you see on the tach to the RPM max HP in the book. I would think engine would be designed to spin fast enough to get to rated horsepower without damage.

Turtle n Peeps

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Posted: 03/28/23 11:09am Link  |  Quote  |  Print  |  Notify Moderator

Let it rev.


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Posted: 03/28/23 11:35am Link  |  Quote  |  Print  |  Notify Moderator

On a steep downhill, with 10K pushing me, I prefer to not use t/h, and manually select gear I want to use. This works best for me, on long downhills, that also include lots of turns.

Jerry





mkirsch

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Posted: 03/28/23 11:35am Link  |  Quote  |  Print  |  Notify Moderator

Define "really high."

In my experience people start having kittens when their engine RPMs exceed 2000 for some reason.


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Lantley

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Posted: 03/28/23 11:44am Link  |  Quote  |  Print  |  Notify Moderator

If you are going down a steep incline really high revving is maybe normal. If your running on flat ground and brake there maybe some revving , but it shouldn't be really high. Are you braking too hard? The harder you brake the more stopping force and revving you create.


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Grit dog

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Posted: 03/28/23 01:06pm Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:

On a steep downhill, with 10K pushing me, I prefer to not use t/h, and manually select gear I want to use. This works best for me, on long downhills, that also include lots of turns.

Jerry


Not sure I’ve seen a manual mode (+/- button) on any newer truck that will prevent further downshifting if the truck calls for it. Either slowing down below min speed for the top gear selected or in a grade braking scenario.
From the old 6 speed Fords that the OP has to new GM 10speeds.
They’re great at limiting up shifts to whatever top gear you want to maintain.

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