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Open Roads Forum  >  Tow Vehicles

 > F-350 6.2 gas - cruise control response lazy

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noteven

Turtle Island

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Posted: 06/03/21 08:09am Link  |  Quote  |  Print  |  Notify Moderator

On cruise in rolling hill terrain the speed will drop 5 mph before the engine / trans gets around to leaning into the harness. The committee meeting takes longer than I like and it must annoy following traffic. Once a downshift is decided on then the truck accelerates uphill back to cruise speed. No, this is not the best strategy for fuel economy.

It is marginally better in tow/haul. The other tow/haul function is fine.

It is also a bit better on 91 gas vs 87 but it is still there.

If I use manual trans mode which is available with cruise on, shifts are crisp and instantaneous, and the engine rarely needs to be above 3000 or 3500 rpm to get the job done with my camper / trailers. Set speed is easily maintained. The lag and then drop 2 gears downshift and accelerate cycle is gone completely.

Is the throttle / downshift respone on cruise control programmable on a 2012 era F-350 6.2 gas Torqshift 6 speed without spending hundreds$ on a tuner?

Thanks

Before you post "get a diesel" - it's ok I have one in my Kenworth complete with dools.

jdc1

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Posted: 06/03/21 09:32am Link  |  Quote  |  Print  |  Notify Moderator

There are various fuel mileage mandates. This is EXACTLY why the truck responds that way, to increase fuel mileage.

JKJavelin

Milwaukee, WI

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Posted: 06/03/21 09:55am Link  |  Quote  |  Print  |  Notify Moderator

This is why I got rid of my 2016 gas Ram. By the time it decides to get going, it's in the hole big time and has to try to catch up, and when towing up a mountain pass, it might not catch up until over the top. Hello Cummins!
JK


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2112

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Posted: 06/03/21 10:07am Link  |  Quote  |  Print  |  Notify Moderator

My F150 does the exact same thing. I don't think the cruise was intended for hill country.
I'm proactive and give it the gas when I see an incline coming. Sometimes I just take it off of cruise and drive it the old fashion way.


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theoldwizard1

SE MI

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Posted: 06/03/21 10:26am Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

If I use manual trans mode which is available with cruise on, shifts are crisp and instantaneous, ...

When I towed with my old E150 4.6L, I always took it out of overdrive when I approached a hill.

dodge guy

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Posted: 06/03/21 10:49am Link  |  Quote  |  Print  |  Notify Moderator

Welcome to the world of crappy Ford cruise control! my V-10 Excursion did the same thing as does my current V-10 MH. by the time the PCM decides to open the throttle, you have already lost 5mph. so now the PCM has to open it more, when it realizes its not gaining speed it opens it more, now its at WOT and it downshifts 2 gears to try and bring the speed back up. even my 02 Excursion that was cable operated throttle body reacted this way. Our Explorer does the same thing. you have to give it throttle just before the hill to keep it from doing all that.
my old Dodge conv van, minivan and my current Chrysler 300 don't do that at all.
I will not own another Ford just because of this one feature, and the fact they rot away after 5 years!


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monkey44

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Posted: 06/03/21 10:50am Link  |  Quote  |  Print  |  Notify Moderator

Personally, I like driving my truck ... never use cruise control. Feels like the truck is less 'agile' for whatever reason, especially in hill country.


Monkey44
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valhalla360

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Posted: 06/03/21 11:43am Link  |  Quote  |  Print  |  Notify Moderator

In hilly country (short up and down hills), cruise control has never been a great option.

I can look ahead and let the speed pick up by 5-10mph on the downhill and then let 5-10mph bleed off on the uphill...minimizing shifting and having to go wide open throttle.

As long as I'm not disrupting traffic, I'm fine with that...and usually the semis are doing the same thing, so it's not just me.


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noteven

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Posted: 06/03/21 11:53am Link  |  Quote  |  Print  |  Notify Moderator

jdc1 wrote:

There are various fuel mileage mandates. This is EXACTLY why the truck responds that way, to increase fuel mileage.


Well, they dropped the ball on that idea because it does nothing of the sort when towing and hauling. Maybe in the make believe world of EPA dynamometer testing. It has plenty of power to fluff along at 1500 rpm empty truck the sleepiness doesn’t matter but loaded it’s a pain.

Since my original post I have done a bit of reading … until meetings have taken place the ECM may not even be opening the throttle body fully as the load increases and speed falls away. I’m like, huh? It’s a truck…

Krusty

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Posted: 06/03/21 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

I just help mine out with my foot when its not keeping up


Krusty
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